U.S. patent application number 15/589690 was filed with the patent office on 2017-11-09 for forced air thermal energy storage system.
This patent application is currently assigned to Viking Cold Solutions, Inc.. The applicant listed for this patent is Viking Cold Solutions, Inc.. Invention is credited to Roger Ansted, Michael P. Crisman, Brian Hampton, Stan Nabozny, Paul Robbins.
Application Number | 20170321912 15/589690 |
Document ID | / |
Family ID | 60203650 |
Filed Date | 2017-11-09 |
United States Patent
Application |
20170321912 |
Kind Code |
A1 |
Ansted; Roger ; et
al. |
November 9, 2017 |
FORCED AIR THERMAL ENERGY STORAGE SYSTEM
Abstract
A system including a chilled air generation system, a forced air
convection system, one or more phase change material (PCM) modules,
and a controller. The controller is configured to regulate the
temperature of a facility by selectively utilizing the chilled air
generation system and the forced air convection system based on
multiple factors, which may include energy source type(s), relative
costs of the energy from the source(s), availability of energy from
the source(s), facility temperature, PCM module temperature, and/or
temperature of goods stored within the facility, among other
considerations. The controller may thus advantageously and
cost-effectively control the periods of time during which the
chilled air generation system is used and those during which the
thermal energy stored in the PCM modules is used.
Inventors: |
Ansted; Roger; (Houston,
TX) ; Crisman; Michael P.; (Houston, TX) ;
Nabozny; Stan; (Houston, TX) ; Hampton; Brian;
(Houston, TX) ; Robbins; Paul; (Houston,
TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Viking Cold Solutions, Inc. |
Houston |
TX |
US |
|
|
Assignee: |
Viking Cold Solutions, Inc.
Houston
TX
|
Family ID: |
60203650 |
Appl. No.: |
15/589690 |
Filed: |
May 8, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62332903 |
May 6, 2016 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F28D 1/024 20130101;
F28D 20/028 20130101; Y02E 60/14 20130101; F28D 20/02 20130101;
F28D 17/00 20130101; F28F 27/00 20130101; F28D 2020/0008 20130101;
F24F 5/0021 20130101; Y02E 60/145 20130101; Y02E 60/147 20130101;
F24F 11/47 20180101 |
International
Class: |
F24F 5/00 20060101
F24F005/00; F28D 20/02 20060101 F28D020/02; F28D 17/00 20060101
F28D017/00 |
Claims
1. A system, comprising: a forced air convection system configured
to: provide a chilled airflow from a chilled air generation system
during a first period of time; and generate a convective airflow
during a second period of time; one or more phase change material
(PCM) modules for thermal energy storage, each comprising a phase
change material, wherein the PCM module(s) is(are) configured to
exchange heat with the convective airflow and the chilled airflow;
and a controller configured to determine the second period of time
based, at least in part, on the first period of time.
2. The system of claim 1, wherein the PCM module(s) is(are)
configured to be mounted to a ceiling of a facility, a wall of a
facility, or a rack of a facility, respectively.
3. The system of claim 1, wherein the PCM module is configured to
be mounted to a rack of a facility, wherein the rack is structure
on which goods may be disposed.
4. The system of claim 3, wherein the forced air convection system
is disposed at a higher elevation than the PCM module on the
rack.
5. The system of claim I, wherein the PCM has a solid to liquid
phase transition temperature or temperature range such that heat
exchange between the convective airflow and the PCM module causes a
portion of the phase change material of the PCM module to undergo a
solid to liquid phase transition.
6. The system of claim 1, wherein the PCM has a liquid to solid
phase transition temperature or temperature range such that heat
exchange between the chilled airflow and the PCM module causes a
portion of the phase change material of the PCM module to undergo a
liquid to solid phase transition.
7. The system of claim 6, wherein the convective airflow and the
chilled airflow are different airflows, and wherein the first
period of time is different than the second period of time.
8. The system of claim 6, wherein the PCM has a liquid to solid
phase transition that occurs below a freezing temperature of
water.
9. The system of claim 8, wherein the PCM has a solid to liquid
phase transition that occurs at a temperature below a freezing
temperature of water.
10. The system of claim 2, wherein the facility is a walk in
freezer, a walk in refrigerator, a room of a building, a cargo
container, a shipping container, a refrigerated food transport
vehicle, a trailer, a trailer of a tractor unit, a ship, an
airplane, or a rail car.
11. The system of claim 2, further comprising a sensor to measure
an ambient temperature of the facility.
12. The system of claim 2, further comprising a sensor to measure a
temperature of a good disposed within the facility.
13. The system of claim 1, further comprising a sensor to measure a
temperature of the PCM module or the phase change material disposed
within a PCM module.
14. The system of claim I, wherein the controller is further
configured to: send a command to the chilled air generation system
during the second period of time that activates the chilled air
generation system that generates the chilled airflow; activate a
reversible fan module of the forced air convection system in a
first direction during the second period of time; send a second
command to the chilled air generation system that deactivates the
chilled air generation system during the first period of time; and
activate the reversible fan module of the forced air convection
system in a second direction during the first period of time.
15. The system of claim 14, wherein the controller is configured to
determine when to activate and deactivate the chilled air
generation system based on a cost of electricity, wherein the cost
of electricity during the second period of time is less than a cost
of electricity during the first period of time.
16. The system of claim 15, wherein the controller is configured to
determine when to activate and deactivate the chilled air
generation system based on an availability of electricity from a
renewable power source, wherein the electricity from the renewable
power source is available during the second period of time.
17. The system of claim 14, further comprising a renewable energy
source configured to supply power to the chilled air generation
system and the forced air convection system during the second
period of time.
18. The system of claim 17, further comprising an on-demand energy
source configured to supply power to the forced air convection
system during the first period of time.
19. The system of claim 17, further comprising a battery backup
configured to supply power to the forced air convection system
during the first period of time.
20. The system of claim 14, wherein power is not available from an
on-demand source during the first period.
21. The system of claim 17, wherein power is available from an
on-demand source during the second period.
22. A system, comprising: a facility having an internal area; a
forced air convection system configured to generate a convective
airflow within the internal area of the facility: a chilled air
generation system for periodically supplying a chilled airflow to
the internal area of the facility; one or more phase change
material (PCM) modules, each comprising a phase change material,
wherein the PCM module(s) is(are) configured to exchange heat with
air in the internal area; and a controller configured to determine:
a first time period or periods during which to operate the forced
air convection system; and a second time period or periods during
which to operate the chilled air generation system; wherein the
controller is configured to determine the respective time periods
based on: one or more of a temperature of the air within the
internal area of the facility, a temperature of a good stored
within the facility, or a temperature of the phase change material
or the PCM modules; and a cost and/or availability of electricity
from a power supply.
23. The system of claim 22, wherein the power supply comprises one
or more of an on-demand power source, a renewable power source, or
a battery backup.
24. The system of claim 22, wherein the chilled air generation
system is configured to provide chilled air at a temperature lower
than a phase transition temperature of the phase change material
(PCM), wherein: the PCM has a liquid to solid phase transition
temperature or temperature range such that heat exchange between
the chilled airflow and the PCM module causes a portion of the
phase change material of the PCM module to undergo a liquid to
solid phase transition; and the PCM has a solid to liquid phase
transition temperature or temperature range such that, as the
temperature within the facility increases, heat exchange between
the convective airflow and the PCM module causes a portion of the
phase change material of the PCM module to undergo a solid to
liquid phase transition, thereby regulating a temperature of the
air within the facility.
25. The system of claim 22, wherein the controller is configured to
operate the chilled air generation system: during periods of low
relative cost of electricity from an on-demand power supply; or
during periods when power is available from a renewable power
source.
26. The system of claim 25, wherein the controller is configured to
operate the forced air convection system and regulate temperature
within the facility via heat exchange between the air and the PCM
modules: during periods of high relative cost of electricity from
an on-demand power supply; or during periods when power is not
available from a renewable power source; or during periods when
power is available from a battery backup.
27. The system of claim 26, wherein the controller is further
configured to activate the forced air convection system at a first
temperature threshold and to activate the chilled air generation
system at a second temperature threshold.
28. The system of claim 27, wherein the controller is configured
to: send a command to the chilled air generation system during the
second time period that activates the chilled air generation system
that generates the chilled airflow; activate a reversible fan
module of the forced air convection system in a first direction
during the second time period; send a second command to the chilled
air generation system that deactivates the chilled air generation
system during the first time period; and activate the reversible
fan module of the forced air convection system in a second
direction during the first time period.
Description
BRIEF DESCRIPTION OF DRAWINGS
[0001] Certain embodiments of the invention will be described with
reference to the accompanying drawings. However, the accompanying
drawings illustrate only certain aspects or implementations of the
invention by way of example and are not meant to limit the scope of
the claims.
[0002] FIG. 1 shows a diagram of a system in accordance with one or
more embodiments of the invention.
[0003] FIG. 2A shows an isometric view of an example phase change
material (PCM) module in accordance with one or more embodiments of
the invention.
[0004] FIG. 2B shows an isometric view of a second example phase
PCM module in accordance with one or more embodiments of the
invention.
[0005] FIG. 3 shows an isometric view of a wall PCM module in
accordance with one or more embodiments of the invention.
[0006] FIG. 4 shows an isometric view of a ceiling PCM module in
accordance with one or more embodiments of the invention.
[0007] FIG. 5A shows an isometric view of a rack PCM module in
accordance with one or more embodiments of the invention.
[0008] FIG. 5B shows a second isometric view of the rack PCM module
in accordance with one or more embodiments of the invention.
[0009] FIG. 6 shows an isometric view of a forced air convection
system in accordance with one or more embodiments of the
invention.
[0010] FIG. 7A shows a first airflow diagram near a forced air
convection system in accordance with one or more embodiments of the
invention.
[0011] FIG. 7B shows a second airflow diagram near a forced air
convection system in accordance with one or more embodiments of the
invention.
[0012] FIG. 8A shows a flowchart of a first method of operating a
forced air convection system controller in accordance with one or
more embodiments of the invention.
[0013] FIG. 8B shows a flowchart of a second method of operating a
forced air convection system controller in accordance with one or
more embodiments of the invention.
[0014] FIG. 9 shows a flowchart of a method of operating a
controller of a system in accordance with one or more embodiments
of the invention.
[0015] FIG. 10 shows a flowchart of a method of operating a
controller of a system in accordance with one or more embodiments
of the invention.
[0016] FIG. 11 shows a diagram of a first example system in
accordance with one or more embodiments of the invention.
[0017] FIG. 12 shows a diagram of a second example system in
accordance with one or more embodiments of the invention.
[0018] FIG. 13 shows a diagram of a third example system in
accordance with one or more embodiments of the invention.
DETAILED DESCRIPTION
[0019] Specific embodiments will now be described with reference to
the accompanying figures. In the following description, numerous
details are set forth as examples of the invention. It will be
understood by those skilled in the art that one or more embodiments
of the present invention may be practiced without these specific
details and that numerous variations or modifications may be
possible without departing from the scope of the invention. Certain
details known to those of ordinary skill in the art are omitted to
avoid obscuring the description.
[0020] In general, embodiments of the invention relate to devices,
systems, and/or methods for temperature control. A system in
accordance with one or more embodiments of the invention may
include a chilled air generation system that provides chilled air.
The chilled air may be provided to a facility for the storage of
temperature sensitive goods. The facility may be, for example, a
thermally insulated room of a building. Air, as used herein, refers
to air or hypoxic air.
[0021] The system may also include one or more phase change
material (PCM) modules disposed within the facility. The PCM
modules may be mountable to a wall, ceiling, or other structure
within the facility. The PCM modules may provide thermal energy
storage that is used, in part, to regulate the temperature within
the facility and/or the temperature of the goods disposed within
the facility. The PCM modules may include a quantity of phase
change material that has a solid to liquid phase transition
temperature between
-60.degree. Fahrenheit and 40.degree. Fahrenheit. The PCM module
may further include a sensor for measuring the temperature of the
PCM or the PCM module. The temperature sensor may be a component of
the PCM module or may be an external component linked to a
controller by a communication link and thereby the controller may
determine the temperature of the PCM or the PCM module based on
information sent to the controller by the temperature sensor.
[0022] The PCM modules may be configured to be mounted, for
example, to a wall of the facility, to a ceiling of the facility,
to a floor of the facility, to a rack that is disposed within the
facility, or to any other structure within the facility. For
example, a PCM module may include a wall mounting flange that may
be secured to the wall and thereby secure the PCM module to the
wall.
[0023] The chilled air generation system, when active, may provide
chilled air to the facility that causes the PCM modules to undergo
a liquid to solid phase change. When the chilled air generation
system is not active, a portion of the PCM within the PCM modules
may undergo a solid to liquid phase change and thereby absorb heat.
Absorbing heat may regulate the temperature of the facility at the
solid to liquid phase change temperature while the chilled air
generation system is not active.
[0024] The system may also include one or more forced air
convection systems disposed within the facility. The forced air
convection system may facilitate the regulation of the temperature
of goods disposed near the forced air convection system and/or the
temperature within the facility.
[0025] In one or more embodiments of the invention, the forced air
convection system may include a reversible fan unit. The reversible
fan module may be configured to generate a forced airflow in a
first direction or a forced airflow in a second direction, which is
opposite the first direction. The convective airflow generated by
the reversible fan module may pass by one or more PCM modules
within the facility and thereby exchange heat with the PCM
modules.
[0026] Exchanging heat with the PCM modules may change the
temperature of the airflow generated by the forced air convection
system. The resulting temperature changed airflow may be used to
regulate the temperature of goods disposed in the facility. For
example, the forced air convection system may generate an airflow
that causes warm ambient air to pass by PCM modules that have a
temperature lower than the temperature of the warm ambient air. The
airflow generated may exchange heat with the PCM modules and
thereby reduce the temperature of the airflow to a lower
temperature. The reduced temperature airflow may be directed
towards goods in the facility and thereby cool the goods or via
mixing may maintain the environment within the facility at or near
a desired temperature or temperature range, thereby maintaining the
desired temperature of the goods.
[0027] In one or more embodiments of the invention, the airflow
generated by the forced air convection system may also interact
with the PCM modules and therein cause heat exchange between the
airflow and the PCM modules. The aforementioned heat exchange may
also cool the nearby goods.
[0028] The system may also include a controller that is operably
connected to the chilled air generation system and the forced air
convection system. The controller may be configured to control the
generation of chilled air by the chilled air generation system and
the operation of the forced air convection system. The controller
may activate the chilled air generation system and the forced air
convection system selectively to regulate the temperature of the
facility and/or goods disposed within the facility. The controller
may also be configured to minimize the use of energy and/or cost of
the use of energy needed to regulate the temperature of the
facility and/or the goods disposed within the facility.
[0029] The system may also include a power distributor that is
operably connected to the controller. The power distributor may
control the supply of power to the chilled air generation system
and/or the forced air convection system. The power distributor may
be connected to one or more power sources. When multiple power
sources are available, the power sources may include, for example,
a first power source that is an on-demand power source and a second
power source that is a renewable power source. The power
distributor may be configured to supply power from the renewable
power source when such power is available and to supply power from
the on-demand power source when power from the renewable power
source is not available. The operation of the power distributor may
be specified by the controller by way of sending a command through
the operable connection.
[0030] The controller may also be configured for temporally
shifting power use or peak power usage. For example, an on-demand
power source may have a higher cost during the daytime, such as
during normal business hours or when residential usage may be
highest. Likewise, a solar power source may be available only
during the day, and wind power may only be available when winds are
sufficient to produce power. The PCM modules may provide for
temperature regulation within the facility during peak power cost
times and/or during low power availability times, and the
controller(s) may be configured to operate the chilled air
generation system when power is available and/or low cost. The
system and controller may thus account for numerous factors to
determine when to operate the chilled air generation system and
when to operate based on the thermal energy storage of the PCM
modules. In some embodiments, these periods of time may also
coincide with times when the chilled air generation system may
operate at higher efficiency.
[0031] A method of operating systems disclosed herein may include,
for example, utilizing the renewable power source during a first
time period, when such power is available, to operate the chilled
air generation system. Operation of the chilled air generation
system may cause the PCM modules to undergo a liquid to solid phase
change. The method may also include deactivating the chilled air
generation system during a second period of time when power from
the renewable power source is unavailable. During the second time
period, the fans of the forced air convection system may operate,
continuously or intermittently, and thereby generate convection
currents within the facility. The convection currents may cause
heat transfer to the PCM modules which is absorbed by way of a
solid to liquid phase change of a portion of the PCM modules.
Absorption of the heat may regulate the temperature of the facility
and/or the temperature of goods disposed within the facility.
[0032] FIG. 1 shows a diagram of a system in accordance with one or
more embodiments of the invention. The system may regulate the
temperature of goods and/or the temperature of a facility in which
the goods are disposed. The system includes a facility (100), a
chilled air generation system (120), one or more PCM modules (130,
131, 132), and a controller (160). Additionally, where two or more
power sources are available, the system may include a power
distributor (150). The facility, as noted above, included means to
circulate air within the facility, and the circulation may be
provided by a fan of the chilled air generation system, for
example, or may be provided via a separate forced air convection
system (140). Each of the components of the system is described
below.
[0033] The system may include a facility (100). The facility may be
a physical structure. Goods (110) may be stored within the
facility. For example, goods (110) may be disposed on racks (115)
within the facility. The goods (100) may be temperature sensitive
and may spoil or otherwise become less valuable when exposed to
temperatures that fall outside of a predetermined range.
[0034] In one or more embodiments of the invention, the facility
(100) may be a building. The building may be insulated. For
example, the building may be a static structure that includes
insulated walls.
[0035] In one or more embodiments of the invention, the facility
(100) may be a room of a building. The room may be insulated, e.g.,
at least a portion of the walls, roof, and/or floor of the room may
be thermally insulated from a surrounding environment. For example,
the room may be a walk in freezer or refrigerator.
[0036] In one or more embodiments of the invention, the facility
(100) may be an enclosure. The enclosure may be, for example, a
train car, a shipping container, a storage container, a
frozen/refrigerated goods shipping vehicle, or any other moveable
structure that may store goods. The enclosure may be a refrigerated
transport vehicle or a refrigerated box car of a train. In one or
more embodiments of the invention, the refrigerated box car may
include an insulated portion, a chilled air supply that supplies
chilled air to the insulated portion, a PCM module disposed within
the insulated portion, and/or a forced air convection system
disposed within the insulated portion. The vehicle may be any type
of vehicle including, but not limited to, an automobile, train car,
boat, or aircraft.
[0037] The system may include a chilled air generation system
(120). The chilled air generation system (120) may be a physical
structure that produces chilled air. The chilled air generation
system (120) may include an air return (121) that receives air from
the facility (100) and a chilled air feed (122) that supplies
chilled air to the facility (100). The chilled air generation
system (120) may be any type of air conditioning system and may
include condenser coils, defrost unit, and thermostats, among other
components.
[0038] The chilled air generation system (120) may be connected to
the controller (160) by an operable connection. The chilled air
generation system (120) may receive commands from the controller
(160) by way of the operable connection and thereby perform action
under the direction of the controller. For example, various sensors
may send temperature measurements to the controller. For example,
one or more temperature sensors measuring a temperature of the air
within the facility, a temperature of the PCM or PCM module, and/or
a temperature of the good may be monitored by the controller. By
way of the operable connection, the controller may send a command
to the chilled air generation system to generate chilled air based
on one or more of the temperature measurements.
[0039] The system may further include one or more PCM modules (130,
131, 132). The PCM modules (130, 131, 132) may be physical
structures. The PCM modules (130, 131, 132) may facilitate the
regulation of the temperature of the goods disposed within the
facility and/or the temperature of the facility. The PCM modules
(130, 131, 132) may include a volume of phase change material that
has a solid to liquid phase transition temperature or temperature
range. The phase change materials) used and the associated solid to
liquid phase transition temperature may be selected, for example,
based on a regulation temperature of the goods disposed within the
facility and/or the regulation temperature of the facility.
[0040] Each of the PCM modules (130, 131, 132) may include one or
more housings and each housing may include one or more phase change
material reception ports. The housings may be made of, for example,
a plastic, such as high density polyethylene, or any other
appropriate material that may provide the desired compatibility
with the phase change material and the requisite heat transfer
characteristics. The shape of the housings may be, for example,
cylindrical, rectangular, or in the form of a panel. In one or more
embodiments of the invention, the housings may have a shape that
maximizes heat exchange between the PCM module and airflow
proximate the PCM module (130, 131, 132). The housings may have
other shapes without departing from the invention.
[0041] The phase change material reception ports may be closable
orifices for receiving a phase change material and thereby enabling
a quantity of phase change material to be disposed within the
housings. The housings may be configured to contain, for example,
up to 1 gallon of phase change material. The phase change material
may have a solid-liquid phase change temperature or temperature
range based on a desired regulation temperature of goods. In one or
more embodiments of the invention, the solid-liquid phase change
temperature is between -60.degree. and 40.degree. Fahrenheit, such
as between -20.degree. and 40.degree. Fahrenheit, or between
0.degree. and about 30.degree. Fahrenheit.
[0042] The quantity and/or type of phase change material may be set
based on the desired regulation temperature of the goods. In one or
more embodiments of the invention, the phase change material may
include water and a quantity of one or more salts. The
concentration of the one or more salts may be set, at least in
part, on a desired temperature profile of the goods. In one or more
embodiments of the invention, the regulation temperature of the
goods is between -60.degree. Fahrenheit and 50.degree.
Fahrenheit.
[0043] In one or more embodiments of the invention, a PCM module
may be configured to be mounted to a structure. FIG. 2A shows an
example of a PCM module (250) in accordance with embodiments of the
invention that is configured to mount to a structure. More
specifically, FIG. 2A shows an isometric view of an example of a
PCM module (250) in accordance with one or more embodiments of the
invention. As seen from FIG. 2A, the PCM module (250) includes a
number of housings (255) for holding phase change material. While
not shown, each housing (255) may include one or more orifices that
enable phase change material to be added or removed from an
internal volume of the housing.
[0044] Each of the housings may be disposed on a support structure
(260). The support structure (260) may mechanically connect each of
the housings (255). In one or more embodiments of the invention,
the support structure (260) may include one or more rails. The
rails may be, for example, structural pipe, plastic pipe, or metal
pipe. The rails may pass through each of the housings (255), or may
individually attach two housings (255) to collectively form a unit.
In one or more embodiments of the invention, the support structure
(260) may include one or more cross members that improve the
stiffness of the support structure (260). In one or more
embodiments of the invention, the support structure may be
configured to mechanically attach to the facility or to a structure
within the facility, and in some embodiments may be configured to
attach to the housing of the forced air convection system (140)
(FIG. 1).
[0045] In one or more embodiments of the invention, the support
structure (260) may spatially separate each of the housings (255)
and thereby create airflow paths. The airflow paths may increase
convective heat exchange between the PCM module (250) and an
airflow proximate the PCM module (250). The support structure (260)
may include one or more spacers (265) disposed on the rails and
between adjacent housings (255). The spacers may be, for example,
sections of plastic pipe or metal pipe having an inner diameter
that is larger than the outer diameter of each rail.
[0046] While the example PCM module shown in FIG. 2A includes four
housings, the shape, size, quantity, and orientation of the
housings may be varied without departing from the scope of the
invention.
[0047] For example, FIG. 2B shows an isometric view of a second
example of a PCM module (270) in accordance with one or more
embodiments of the invention. As seen from FIG. 2B, the PCM module
(270) includes a number of housings (275) for holding phase change
material. In comparison to the housings (255, FIG. 2A) of the
example PCM module (250, FIG. 2A), the housings (275) of the second
example PCM module (270) are thinner and a greater number of
plastic housings (275) are disposed on the support structure. Thus,
the size, number, and spacing of the plastic housings (275) may be
modified without departing from the invention.
[0048] Returning to FIG. 1, the example PCM module shown in FIGS.
2A and/or 2B may be configured to mount: to a ceiling of the
facility, e.g., a ceiling PCM module (130); to a wall of the
facility, e.g., a wall PCM module (131); and/or to a rack or other
structure disposed within the facility (100), e.g., rack PCM module
(132).
[0049] FIG. 3 shows a wall PCM module (131) in accordance with one
or more embodiments of the invention. The wall PCM module (131) may
include like parts as those of the example PCM module shown in FIG.
2A. The wall PCM module (131) may also include one or more wall
mounting brackets (310). The wall mounting brackets (310) may be
physical structures that are configured to attach the wall PCM
module (131) to a wall (310) of the facility. For example, the wall
mounting brackets may include a wall flange and a section of pipe
that spaces the wall PCM module (131) a fixed distance from the
wall (300) when attached to the wall (300) by the wall mounting
brackets (310).
[0050] While the wall mounting brackets in FIG. 3 are illustrated
as being a set of four and extending at a right angle from the wall
PCM module (131), the number of wall mounting brackets (310),
mounting location, and orientation may be varied without departing
from the invention.
[0051] FIG. 4 shows a ceiling PCM module (130) in accordance with
one or more embodiments of the invention. The ceiling PCM module
(130) may include like parts as those of the example PCM module
shown in FIG. 2A. The ceiling PCM module (130) may also include one
or more ceiling mounting brackets (400). The ceiling mounting
brackets (400) may be physical structures that are configured to
attach the ceiling PCM module (130) to a ceiling (not shown) of the
facility. For example, the ceiling mounting brackets (400) may
include a ceiling flange (405) and a section of pipe (410) that
spaces the ceiling PCM module (130) a fixed distance from the
ceiling when attached to the ceiling by the ceiling mounting
brackets (400).
[0052] While the ceiling mounting brackets in FIG. 4 are
illustrated as being a set of two and extending at a right angle
from the ceiling PCM module (130), the number of ceiling mounting
brackets (400), mounting locations, and mounting orientation may be
varied without departing from the invention.
[0053] FIG. 5A shows a first view of a rack PCM module (132) in
accordance with one or more embodiments of the invention. In FIG.
5A, a grating of the rack PCM module (132) is not shown. In FIG.
5B, the gating of the rack PCM module (132) is shown.
[0054] The rack PCM module (132) may include like parts as those of
the example PCM module shown in FIG. 2A. The rack PCM module (132)
may also include one or more rack mounting rails (500). The rack
mounting rails (500) may be physical structures that are configured
to attach the rack PCM module (132) to a rack that is disposed
within a facility, e.g., a portion of a structure within the
facility. For example, the rack mounting rails (500) may include
one or more adapters (505) that mount the rack PCM module (132) to
the rack mounting rails (500). The rack mounting rails (500) may,
in turn, be mounted to a rack.
[0055] While the rack mounting rails (500) in FIG. 5A are
illustrated as being a set of two and extending along a depth of
the rack PCM module (132), the number of rack mounting rails (500),
mounting locations, and mounting orientation may be varied without
departing from the invention.
[0056] FIG. 5B shows a second view of the rack PCM module (132) in
accordance with one or more embodiments of the invention. As seen
from FIG. 5B, the rack PCM module (132) may include a platform
(510). In one or more embodiments of the invention, goods may be
disposed on the platform (510).
[0057] The platform (510) may be a physical structure. In one or
more embodiments of the invention, the platform (510) may be a wire
frame structure that enables an airflow through the platform (510).
By allowing airflow through the platform (510), thermal exchange
between the PCM modules of the rack PCM module (132) may be greater
than thermal exchange between the PCM modules of the rack PCM
module (132) in proximity to a platform (510) that does not enable
airflow through the platform (510).
[0058] Returning to FIG. 1, the system may include one or more
forced air convection systems (140). FIG. 6 shows a diagram of a
forced air convection system in accordance with one or more
embodiments of the invention. The forced air convection system may
include a pallet (600), a housing (610), optionally one or more
integrated PCM modules (620), a reversible fan module (630), a
battery backup (640), and a forced air convection system controller
(650). Each component of the forced air convection system is
described below.
[0059] The forced air convection system may include a pallet (600).
The pallet (600) may be a structural member that is a base for
other components of the forced air convection system. The pallet
(600) may be, for example, a wood or metal structure configured to
support the weight of the other components of the forced air
convection system and to enable the forced air convection system to
be easily moved from one location to another location. The pallet
(600) may include a number of airflow channels (605) through which
air may flow and thereby enable air to flow through the pallet
(600). While the pallet (600) is shown as including five narrow
slots as airflow channels (605) in FIG. 1A, one of ordinary skill
in the art will appreciate that the airflow channels (605) may have
other shapes or configurations without departing from the
invention. The flow of air near the pallet is further described
with respect to FIGS. 7A-7B.
[0060] The forced air convection system may include a housing
(610). The housing (610) may include an airflow path from the
pallet (600) to the reversible fan module (630). A first end of the
airflow path may be disposed proximate the pallet (600) and the
second end of the airflow path may be disposed proximate the
reversible fan module (630). The flow of air through the housing is
further described with respect to FIGS. 7A-7B.
[0061] The housing (610) may be made of a structural material such
as metal. In one or more embodiments of the invention, the metal
may be aluminum. The housing (610) may be disposed on the pallet
and support the reversible fan module (630). While the housing
(610) is depicted as a tubular structure having a rectangular cross
section in FIG. 6, one of ordinary skill in the art will appreciate
that the housing (610) may have other shapes or configurations
without departing from the invention.
[0062] The forced air convection system may optionally include one
or more integrated PCM modules (620). Each of the integrated PCM
modules (620) may include one or more housings and each housing may
include one or more phase change material reception pods. The
housings may be made of, for example, high density polyethylene.
The shape of the housings may be, for example, cylindrical,
rectangular, or in the form of a panel. In one or more embodiments
of the invention, the housings may have a shape that maximizes heat
exchange between the PCM module and airflow proximate the PCM
module. In one or more embodiments of the invention, the airflow is
generated by the fan module (630). The housings may have other
shapes without departing from the invention.
[0063] The phase change material reception ports may be closable
orifices for receiving a phase change material and thereby enabling
a quantity of phase change material to be disposed within the
housings. The housings may include, for example, up to 1 gallon of
phase change material. The phase change material used may include a
solid-liquid phase change temperature set based on a desired
regulation temperature of goods. In one or more embodiments of the
invention, the solid-liquid phase change temperature is between
-60.degree. and 40.degree. Fahrenheit.
[0064] The quantity and/or type of phase change material may be set
based on the desired regulation temperature of the goods, as well
as the configuration and location of the facility. In one or more
embodiments of the invention, the phase change material may include
water and a quantity of one or more salts. The concentration of the
one or more salts may be set, at least in part, on a desired
temperature profile of the goods. In one or more embodiments of the
invention, the regulation temperature of the goods is between
-20.degree. Fahrenheit and 38.degree. Fahrenheit.
[0065] In one or more embodiments of the invention, the integrated
PCM modules (620) of the forced air convection system may the same
as the PCM module shown in FIG. 2A, and include similar
variations.
[0066] Returning to FIG. 6, the forced air convection system may
include a reversible fan module (630). The reversible fan module
(630) may be configured to generate an airflow through the housing
(610) and/or within the facility, and thereby cause heat exchange
between the airflow and the PCM modules. The reversible fan module
(630) may include one or more fans (631) disposed on a support
structure (632). In one or more embodiments of the invention, the
reversible fan module (630) includes four fans.
[0067] The one or more fans (631) may be electrically driven fans.
In one or more embodiments of the invention, the fans (631) may be
high efficiency fans and draw 4 watts or less of power, each.
[0068] The fans (631) may be reversible and thereby generate a
forward or reverse airflow throughout the housing (610). Each of
the fans (631) may be controlled by a controller, e.g., the
controller may instruct the fans (631) to operate in a forward
direction, a reverse direction, or to not operate.
[0069] The fans (631) may be disposed on a support structure (632).
The support structure (632) may be a mechanical structure that
orients and positions the fans (631) and thereby directs airflow
generated by the fans (631). The support structure (632) may be,
for example, an aluminum frame. While the support structure (630)
is illustrated as a pyramidal structure in FIG. 6, the support
structure (630) may have other shapes without departing from the
invention.
[0070] The forced air convection system may include a battery
backup (640). The battery backup (640) may include a battery and a
regulator. The regulator may be configured to charge the battery
when power from the power distributor (150) is available and to
supply power to the reversible fan module (630) and/or controller
(650) when power from the power distributor (150) is not
available.
[0071] The forced air convection system may include a controller
(650). The controller (650) may be configured to operate the fans
(631) of the reversible fan module (630). The controller (650) may
be further configured to monitor the temperature of goods, phase
change material, and/or the facility, and activate the fans (631)
in response to the monitored temperature exceeding a predetermined
range and/or value.
[0072] The controller (650) may be a computing device such as a
computer, embedded system, microcontroller, or any other type of
computing device. The controller (650) may include a processor,
memory, communication unit, and a non-transitory storage medium on
which instructions are stored that when executed by the processor
cause the controller to perform the functions shown in FIGS. 8A and
8B.
[0073] The processor may be, for example, a central processing
unit. The memory may be, for example, random access memory or
persistent memory. The communication unit may be a network adapter
that allows the controller (650) to communicate with other devices
such as a temperature regulation system. The temperature regulation
system may be, for example, a heating, ventilation, and air
conditioning (HVAC) system, a refrigeration system, or a freezer
system. The non-transitory computer readable medium may be a CD,
DVD, storage device, a diskette, a tape, flash memory, physical
memory, or any other computer readable storage medium.
[0074] The forced air convection system (140) may be connected to
the controller (160) by way of an operable connection and take
action based on commands received from the controller (160). in
some embodiments, the forced air convection system (140) may also
include a controller (650), which may be part of an overall control
system and may be subservient to the controller (160).
[0075] Returning to FIG. 1, the system may include a power
distributor (150). The power distributor (150) may be a power
distribution device configured to supply power to the chilled air
generation system (120) and the one or more forced air convection
systems (140). The power distributor (150) may be a physical device
including one or more electric circuits that enable the power to be
distributed. For example, the power distributor (150) may include
one or more relays, one or more high power transistors, and/or
digital control circuitry for controlling the relays and/or high
power transistors.
[0076] The power distributor (150) may be configured to receive
power from one or more power sources, such as an on-demand power
source (151) and a renewable power source (152). The power
distributor (150) may be further configured to selectively supply
power based on commands received from the controller (160) by way
of an operable connection. For example, during a first time period
the controller (160) may send a command to the power distributor
(150) indicating that power from the renewable power source (152)
should be supplied. During a second period of time, the controller
(160) may send a command to the power distributor (150) indicating
that power from the on-demand power source (151) should be
supplied. Based on the commands, the power distributor (150) may
supply power from the renewable power source (152) during the first
period and may supply power from the on-demand power source (151)
during the second period.
[0077] In one or more embodiments of the invention, the renewable
power source (152) may generate power by receiving light. For
example, the renewable power source (152) may include a
photovoltaic cell or a photo-thermalelectric system. The renewable
power source (152) may produce power intermittently when ambient
conditions allow, e.g., when there is sufficient light to produce
power or power production being proportional to ambient light
intensity.
[0078] In one or more embodiments of the invention, the renewable
power source (152) may generate power by receiving wind. For
example, the renewable power source (152) may include a wind
turbine. The renewable power source (152) may produce power
intermittently when ambient conditions allow, e.g., when there is
sufficient wind to produce power or power production being
proportional to wind speed.
[0079] In one or more embodiments of the invention, the on-demand
power source (151) may generate power by consuming a fuel source,
e.g., coal, natural gas, nuclear, oil, stored water, etc. For
example, the on-demand power source (151) may include a coal fired
steam generator coupled to a turbine. The on-demand power source
(151) may produce power on-demand and as needed, e.g., a base load
power supply.
[0080] The system may include the controller (160). The controller
(160) may be a computing device such as a computer, embedded
system, microcontroller, or any other type of computing device. The
controller (160) may include a processor, memory, communication
unit, and a non-transitory computer readable medium on which
instructions are stored that when executed by the processor cause
the controller to perform the functions shown in FIGS. 9 and
10.
[0081] The processor may be, for example, a central processing
unit. The memory may be, for example, random access memory or
persistent memory. The communication unit may be a network adapter
that allows the controller to communicate with other devices
including the forced air convection system (140) and/or the chilled
air generation system (120) by way of operable connections. The
non-transitory computer readable storage medium may be a CD, DVD,
storage device, a diskette, a tape, flash memory, physical memory,
or any other computer readable storage medium.
[0082] FIG. 8A shows a flowchart in accordance with one or more
embodiments of the invention. The method depicted in FIG. 8A may be
used to operate a forced air convection system controller in
accordance with one or more embodiments of the invention. One or
more steps shown in FIG. 8A may be omitted, repeated, and/or
performed in a different order among different embodiments.
[0083] In Step 800, forced air convection system obtains a command
to activate a reversible fan module. The command may be received
from a controller. The command may include a direction, rotation
rate, duty cycle, and/or other parameter that specifies a
modification of the operation of the reversible fan module. In one
or more embodiments of the invention, the command may be sent to
the forced air convection system via a wired or wireless
connection. For example, the wired or wireless connection may be a
direct wired/wireless connection, e.g., an IEEE 802.15.1 standard
connection, or a network wired/wireless connection, e.g., an IEEE
802.11 standard connection. A network wired or wireless connection
may support Internet Protocol (IP) communications. The wired or
wireless connection may support other communication protocols
without departing from the invention.
[0084] In Step 810, the system activates the reversible fan module
based on the received command, and may activate the reversible fan
module by setting a direction and/or rate of power to one or more
fans of the reversible fan module.
[0085] FIGS. 7A and 7B show examples of airflows generated by the
one or more fans (131) when power is supplied to the one or more
fans (131). In general, the desired direction of airflow generated
by the fans may be based on a relative temperature of the air
within the facility as compared to the temperature of the PCM
modules, among other factors. In the embodiments of FIGS. 7A and
7B, the forced air convection system is illustrated as including
the optional integral PCM modules. Specifically, FIG. 7A shows
airflow, illustrated by arrows with wavy tails, generated by the
one or more fans (131) when the fans are operated in a first
direction and FIG. 7B shows airflow generated by the one or more
fans (131) when the fans are operated in a second direction. As
seen from the illustrations, the airflow throughout the forced air
convection system may be reversed by operating the one or more fans
(131) in a first or second direction and thereby the controller may
control the flow of air within the forced air convection system
and/or within the facility by operating the one or more fans
(131).
[0086] Additionally, when operated in the first direction as shown
in FIG. 7A, the forced air convection system may draw ambient air
into the housing by way of the fans, pass the ambient air near the
PCM modules and thereby cause heat exchange between the PCM modules
and the ambient air, and exhaust the air out of the housing through
the pallet. In contrast, when operated in the second direction as
shown in FIG. 7B, the forced air convection system may draw ambient
air into the housing by way of the pallet, pass the ambient air
near the PCM modules and thereby cause heat exchange between the
PCM modules and the ambient air, and exhaust the air out of the
housing through the fans. Depending on the temperatures of the PCM
modules and the air, heat may flow from the PCM modules and into
the ambient air or from the ambient air and into the PCM
modules.
[0087] FIG. 8B shows a flowchart in accordance with one or more
embodiments of the invention. The method depicted in FIG. 8B may be
used to operate a controller in accordance with one or more
embodiments of the invention. One or more steps shown in FIG. 8B
may be omitted, repeated, and/or performed in a different order
among different embodiments.
[0088] In Step 850, a controller determines an ambient temperature.
The controller may determine the ambient temperature based on a
temperature sensor linked to the controller. The temperature sensor
may be a component of the forced air convection system or may be an
external component linked to the controller by a communication link
and thereby the controller may determine the ambient temperature
based on information sent to the controller by the temperature
sensor.
[0089] In Step 860, the controller activates a reversible fan
module in response to the ambient temperature exceeding a
predetermined temperature. The controller may activate the
reversible fan module by setting a direction and/or rate of power
to one or more fans of the reversible fan module, Activating the
reversible fan module may cause an airflow, as shown in FIGS. 7A
and/or 7B, which causes heat to be exchanged with a PCM module. The
exchange of heat may cool the airflow and thereby cool goods
disposed and/or regulate the temperature of a facility in which the
goods are stored.
[0090] The ambient temperature could exceed a predetermined
temperature for any reason including a failure of a component, a
temporary power outage that renders the chilled air generation
system inoperable, or any other reason.
[0091] In one or more embodiments of the invention, the
predetermined temperature may be a temperature that extends the
shelf life of goods. For example, if the goods are frozen goods,
the predetermined temperature may be 27.degree. Fahrenheit. In a
second example, if the goods are produce, the predetermined
temperature may be 40.degree. Fahrenheit.
[0092] In Step 870, the controller deactivates the reversible fan
module of the forced air convection system in response to the
ambient temperature falling below the predetermined temperature.
The method ends following Step 870.
[0093] FIG. 9 shows a flowchart in accordance with one or more
embodiments of the invention. The method depicted in FIG. 9 may be
used to operate a controller in accordance with one or more
embodiments of the invention. One or more steps shown in FIG. 9 may
be omitted, repeated, and/or performed in a different order among
different embodiments.
[0094] In Step 900, a controller may obtain a first period of time
having a high electricity cost and a second period of time having a
low electricity cost. The controller may be operably linked to a
power distributor, one or more forced air convection systems, and a
chilled air generation system. As the system may require a higher
energy demand during a time period when the chilled air generation
system is running, the controller may optimize the time(s) that the
chilled air convection system is operating. For example, during
peak energy cost times, and/or when less costly (lower relative
cost), renewable energy sources are not available, the controller
may be configured to selectively run the forced air convection
system. The system will thus be utilizing the thermal energy
storage of the PCM module instead of operating the chilled air
generation system. In this manner, the controller may work to
reduce energy demands and decouple the system from constant,
on-demand energy sources, resulting in a cost savings in overall
energy requirements.
[0095] In Step 910, the controller supplies power generated by a
renewable source during the first period of time. The controller
may supply the power by sending a command to the power distributor.
The power distributor may be configured to receive power from an
on-demand source and a renewable source. The command may indicate
that the power distributor is to provide power from the renewable
source to the one or more forced air convection systems and the
chilled air generation system. The command may be sent at the start
of the first time period. In response to the first command, the
power distributor may transmit power received from the renewable
source to the one or more forced air convection systems and/or the
chilled air generation system.
[0096] In Step 920, the controller supplies power generated by the
on-demand source during the second time period. The controller may
supply the power by sending a second command to the power
distributor. The command may indicate that the power distributor is
to provide power from the on-demand source to the one or more
forced air convection systems and the chilled air generation
system. The command may be sent at the start of the second time
period. In response to the second command, the power distributor
may transmit power received from the on-demand source to the one or
more forced air convection systems and/or the chilled air
generation system.
[0097] FIG. 10 shows a flowchart in accordance with one or more
embodiments of the invention. The method depicted in FIG. 10 may be
used to operate a controller in accordance with one or more
embodiments of the invention. One or more steps shown in FIG. 10
may be omitted, repeated, and/or performed in a different order
among different embodiments.
[0098] In Step 1000, a controller may obtain a first period of time
having a high electricity cost and a second period of time having a
low electricity cost. The controller may be operably linked to a
power distributor, one or more forced air convection systems, and a
chilled air generation system. As the system may require a higher
energy demand when the chilled air generation system is running,
the controller may be configured to minimize energy usage during
the first period of time. For example, during peak energy cost
times, or when cheap, renewable energy sources are not available,
the controller may selectively run the forced air convection
system, during the second period of time, utilizing the thermal
energy storage of the PCM module instead of operating the chilled
air generation system for the first period of time. In this manner,
the controller may work to reduce energy demands and decouple the
system from constant, on-demand energy sources, resulting in a cost
savings in overall energy requirements.
[0099] In Step 1010, the controller supplies power generated to the
one or more forced air convection systems and the chilled air
generation system during the first period of time. In one or more
embodiments of the invention, supplying power during the first time
period causes the chilled air generation source to generate a
chilled airflow throughout a facility, where the chilled airflow
has a temperature below a solid-liquid phase change transition
temperature of one or more PCM modules within the facility.
Exposing the PCM modules to the chilled air may cause at least a
portion of the phase change material within the phase change
material modules to undergo a liquid to solid phase transition. The
PCM modules may be wall PCM modules, ceiling PCM modules, or rack
PCM modules, for example.
[0100] In Step 1020, the controller terminates the supply of power
to the one or more forced air convection systems and/or the chilled
air generation source during the second time period. Terminating
the supply of power may terminate the generation of chilled air by
the chilled air generation system. While the chilled air is not
supplied to the facility by the chilled air generation source, the
temperature within the facility may begin to rise. When the
temperature reaches a predetermined temperature, the forced air
convection system may activate and thereby cause convective airflow
within the facility. When the temperate reaches the solid to liquid
phase transition temperature, portions of the phase change material
within the PCM modules may undergo a solid to liquid phase change
and thereby absorb heat. Absorbing heat by the PCM modules may
regulate the temperature of the facility and thereby the
temperature of goods disposed within the facility. The convective
currents generated by the forced air convection system may ensure
uniformity of temperature within the facility by way of convective
thermal exchange.
[0101] Thus, the method shown in FIG. 10 may decrease the cost of
regulating the temperature of goods by shifting the use of
electricity to periods of time when the cost is low and utilizing
PCM modules to regulate the temperature of goods during periods of
time when the cost of energy is high.
[0102] In a like manner, a controller may also be configured to
regulate the temperature of goods by shifting the use of
electricity to periods of time when a renewable energy source is
available, and utilizing PCM modules to regulate the temperature of
goods during periods of time when the renewable energy source is
unavailable.
[0103] The following are examples of systems in accordance with one
or more embodiments of the invention. The following examples are
explanatory examples and not intended to the limit the
invention.
Example 1
[0104] FIG. 11 shows an example system in accordance with
embodiments of the invention. The system includes a facility (100),
a chilled air generation system (120), and a forced air convection
system (140). The chilled air generation system (120) and the
forced air convection system (140) may be configured to operate
based on temperature measurements of the interior of the facility
(100) or goods. More specifically, the chilled air generation
system (120) may be configured to generate chilled air when the
temperature measurement of the interior of the facility (100) or
goods indicates that the measured temperature is above a
predetermined value.
[0105] The forced air convection system (140) may be configured to
operate one or more reversible fan modules (140) in a first
direction when the temperature measurement of the interior of the
facility (100) indicates that the measured temperature is above a
second predetermined value. The forced air convection system (140)
may be further configured to operate the reversible fan modules in
a second direction when the temperature measurement of the interior
of the facility (100) indicates that the measured temperature is
below a second predetermined value.
[0106] The first predetermined value may be less than the second
predetermined value.
Example 2
[0107] FIG. 12 shows an example system in accordance with
embodiments of the invention. The system includes a facility (100),
a chilled air generation system (120), and a first forced air
convection system (1200) and a second forced air convection system
(1201). The chilled air generation system (120), the first forced
air convection system (1200), and the second forced air convection
system (1201) may be configured to operate based on temperature
measurements of the interior of the facility (100). More
specifically, the chilled air generation system (120) may be
configured to generate chilled air when the temperature measurement
of the interior of the facility (100) indicates that the measured
temperature is above a predetermined value.
[0108] Both forced air convection systems (1200, 1201) may be
configured to operate reversible fan modules in a first direction
when the temperature measurement of the interior of the facility
(100) indicates that the measured temperature is above a second
predetermined value. The forced air convection systems (1200, 1201)
may be further configured to operate the reversible fan modules in
a second direction when the temperature measurement of the interior
of the facility (100) indicates that the measured temperature is
below a second predetermined value.
[0109] The first predetermined value may be less than the second
predetermined value.
Example 3
[0110] FIG. 13 shows an example system in accordance with
embodiments of the invention. The system includes a facility (100),
a chilled air generation system (120), a first forced air
convection system (1200), a second forced air convection system
(1201), and multiple PCM modules (1300, 1301, 1302, 1303, 1304,
1305). The chilled air generation system (120), the first forced
air convection system (1200), the second forced air convection
system (1201), and the multiple PCM modules (1300, 1301, 1302,
1303, 1304, 1305) may be configured to operate based on temperature
measurements of the interior of the facility (100), or of the PCM
modules. More specifically, the chilled air generation system (120)
may be configured to generate chilled air when the temperature
measurement of the interior of the facility (100), or PCM modules,
indicates that the measured temperature is above a predetermined
value.
[0111] Both forced air convection systems (1200, 1201) may be
configured to operate reversible fan modules in a first direction
when the temperature measurement of the interior of the facility
(100) indicates that the measured temperature is above a second
predetermined value. The forced air convection systems (1200, 1201)
may be further configured to operate the reversible fan modules in
a second direction when the temperature measurement of the interior
of the facility (100) indicates that the measured temperature is
below a second predetermined value.
[0112] The PCM modules (1300, 1301, 1302, 1303, 1304, 1305) may be
configured to absorb heat when exposed to a temperature that is
above the second predetermined value. The PCM modules (1300, 1301,
1302, 1303, 1304, 1305) may be further configured to release heat
when exposed to a temperature that is below the second
predetermined value. The first predetermined value may be less than
the second predetermined value.
[0113] One or more embodiments of the invention may provide one or
more of the following advantages: i) a system in accordance with
embodiments of the invention may regulate a temperature of a good
and/or a facility in which a good is stored, ii) the system may
reduce the cost of regulating the temperature of goods by
maintaining the temperature of goods using the PCM modules to
regulate temperature during periods of time where the cost of
energy is high, e.g., reduce the cost by 25-50% by selectively not
using chilled air generation systems during time periods when
on-demand energy is more costly or unavailable, iii) the system in
accordance with embodiments of the invention may regulate a
temperature of a good to a desired range for a desired period of
time, for example, of four to eight hours, iv) the system in
accordance with embodiments of the invention may be configurable to
maintain the temperature of goods to a predetermined temperature
between -60.degree. and 40.degree. Fahrenheit, v) the system in
accordance with embodiments of the invention may be reusable, e.g.,
no component is used up or otherwise lost during use, vi) the
system may be configurable to regulate the temperature of a
facility of arbitrary size, and vii) one or more embodiments of the
invention may enable an existing facility to be retrofitted by one
or more embodiments herein.
[0114] As used herein, "time" and "period of time" may refer to
operational phases when certain conditions are met, and may not
necessarily refer to discrete blocks of time, such as 15 minutes or
30 minutes. One of ordinary skill in the art, with the benefit of
the disclosure herein, would appreciate that a first period of time
and a second period of time may be alternately utilized as
necessary by the controller and not on a fixed schedule.
[0115] While the invention has been described above with respect to
a limited number of embodiments, those skilled in the art, having
the benefit of this disclosure, will appreciate that other
embodiments can be devised which do not depart from the scope of
the invention as disclosed herein. Accordingly, the scope of the
invention should be limited only by the attached claims.
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