U.S. patent application number 12/559684 was filed with the patent office on 2010-07-08 for energy management of clothes dryer appliance.
This patent application is currently assigned to General Electric Company. Invention is credited to John K. Besore, Jeff Donald Drake, MICHAEL F. FINCH, Darin Franks, Chad Michael Helms, Jerrod Aaron Kappler, Steven Keith Root, Natarajan Venkatakrishnan, Eric K. Watson, Joshua S. Wiseman.
Application Number | 20100174668 12/559684 |
Document ID | / |
Family ID | 42005534 |
Filed Date | 2010-07-08 |
United States Patent
Application |
20100174668 |
Kind Code |
A1 |
FINCH; MICHAEL F. ; et
al. |
July 8, 2010 |
ENERGY MANAGEMENT OF CLOTHES DRYER APPLIANCE
Abstract
A clothes dryer is provided comprising one or more power
consuming functions and a controller in signal communication with
an associated utility. The controller can receive and process a
signal from the associated utility indicative of current cost of
supplied energy. The controller operates the clothes dryer in one
of a normal operating mode and an energy savings mode based on the
received signal. The controller is configured to change the power
consuming functions by adjusting one or more of an operation
schedule, an operation delay, an operation adjustment, and a
selective deactivation of at least one of the one or more power
consuming functions to reduce power consumption of the clothes
dryer in the energy savings mode.
Inventors: |
FINCH; MICHAEL F.;
(Louisville, KY) ; Besore; John K.; (Prospect,
KY) ; Drake; Jeff Donald; (Louisville, KY) ;
Franks; Darin; (Lanesville, IN) ; Helms; Chad
Michael; (Louisville, KY) ; Kappler; Jerrod
Aaron; (Louisville, KY) ; Root; Steven Keith;
(Buckner, KY) ; Venkatakrishnan; Natarajan;
(Louisville, KY) ; Watson; Eric K.; (Crestwood,
KY) ; Wiseman; Joshua S.; (Elizabethtown,
KY) |
Correspondence
Address: |
FAY SHARPE LLP
1228 Euclid Avenue, 5th Floor, The Halle Building
Cleveland
OH
44115
US
|
Assignee: |
General Electric Company
|
Family ID: |
42005534 |
Appl. No.: |
12/559684 |
Filed: |
September 15, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61097082 |
Sep 15, 2008 |
|
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Current U.S.
Class: |
705/412 ; 34/218;
34/543; 34/572; 34/88; 700/275; 700/296 |
Current CPC
Class: |
Y02B 70/30 20130101;
H02J 13/00017 20200101; Y04S 50/10 20130101; G05B 13/02 20130101;
H02J 13/0075 20130101; H02J 13/00024 20200101; H02J 2310/14
20200101; H02J 13/00004 20200101; H02J 2310/64 20200101; F25D 21/04
20130101; Y02B 70/3225 20130101; Y04S 20/242 20130101; H02J 3/14
20130101; G06Q 50/06 20130101; H02J 13/00026 20200101; Y04S 20/222
20130101; Y04S 40/126 20130101; Y04S 40/124 20130101; Y02B 90/20
20130101; Y04S 20/244 20130101 |
Class at
Publication: |
705/412 ; 34/218;
34/572; 34/88; 34/543; 700/275; 700/296 |
International
Class: |
G06F 1/32 20060101
G06F001/32; F26B 25/06 20060101 F26B025/06; F26B 19/00 20060101
F26B019/00; F26B 21/06 20060101 F26B021/06; G06Q 30/00 20060101
G06Q030/00; G06Q 50/00 20060101 G06Q050/00 |
Claims
1. A clothes dryer comprising: one or more power consuming
features/functions including at least one of a cabinet for
receiving articles to be dried, a fan for drawing air into the
cabinet and circulating air, and a heater for heating air drawn
into the cabinet; and, a controller configured to receive and
process a signal indicative of current state of an associated
utility, the controller operating the clothes dryer in one of a
plurality of operating modes, including at least a normal operating
mode and an energy savings mode, in response to the received
signal, the controller being configured to change the power
consuming features/functions by adjusting one or more of an
operation schedule, an operation delay, an operation adjustment,
and a selective deactivation of at least one of the one or more
power consuming features/functions to reduce power consumption of
the clothes dryer in the energy savings mode.
2. The clothes dryer according to claim 1, wherein the operation
delay is selected from the group consisting of a delay in start
time, an extension of time to the delay start, stopping an existing
cycle and delaying a restart, finishing an existing cycle and
delaying a restart, and stopping after more than one cycle and
delaying a restart.
3. The clothes dryer according to claim 2, wherein the stopping
after more than one cycle occurs after at least one heat cycle
duration.
4. The clothes dryer according to claim 1, wherein the operation
schedule comprises a user interface that gives a user the ability
to select which of the one or more power consuming clothes dryer
functions are scheduled by the clothes dryer control system, that
receives a zip code entry which corresponds to a time of use
schedule of a utility company from which the clothes dryer control
system can determine on-peak mode hours and off-peak mode hours;
that uses a time versus day of the week schedule input method; that
receives a rate signal directly from the utility advising of the
current rate; and schedules activation of clothes dryer to off-peak
mode hours.
5. The clothes dryer according to claim 4, wherein the operation
adjustment adjusts the clothes dryer functions during off-peak mode
hours.
6. The clothes dryer according to claim 5, wherein the operation
adjustment is selected from the group consisting of a reduction in
target temperature in one or more cycles, a disablement of one or
more heaters in one or more cycles, reduction in power to one or
more heaters, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles.
7. The clothes dryer according to claim 1, wherein the operation
adjustment comprises a user interface that gives a user the ability
to select which of the one or more power consuming clothes dryer
functions are used by the clothes dryer control system, that
receives a zip code entry which corresponds to a time of use
schedule of a utility company from which the clothes dryer control
system can determine on-peak mode hours and off-peak mode hours;
that uses a time versus day of the week schedule input method; that
receives a rate signal directly from the utility advising of the
current rate; and adjusts the clothes dryer functions during
on-peak mode hours.
8. The clothes dryer according to claim 7, wherein the operation
adjustment is selected from the group consisting of a reduction in
target temperature in one or more cycles, a disablement of one or
more heaters in one or more cycles, reduction in power to one or
more heaters, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles.
9. The clothes dryer according to claim 7, wherein the operation
delay is selected from the group consisting of a delay in start
time, an extension of time to the delay start, stopping an existing
cycle and delaying a restart, finishing an existing cycle and
delaying a restart, and stopping after more than one cycle and
delaying a restart.
10. The clothes dryer according to claim 1, wherein the operation
adjustment is selected from the group consisting of a reduction in
target temperature in one or more cycles, a disablement of one or
more heaters in one or more cycles, reduction in power to one or
more heaters, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles
11. The clothes dryer according to claim 1, wherein the selective
deactivation includes a user manual override function wherein the
user can override any adjustments to one or more of the power
consuming functions.
12. The clothes dryer according to claim 1, further comprising a
display communicating activation of the energy savings mode.
13. The clothes dryer according to claim 12, wherein the energy
savings mode display includes a message selected from the group
consisting of `"ECO", "Eco", "EP", "ER", "CP", "CPP", "DR", and
"PP".
14. A clothes dryer control method, comprising: a) determining a
state for an associated energy supplying utility, the utility state
being indicative of at least a peak demand period or an off-peak
demand period; b) operating the clothes dryer in a normal mode
during the off-peak demand period; c) operating the clothes dryer
in an energy savings mode during the peak demand period; d)
scheduling, delaying, adjusting and/or selectively deactivating any
number of one or more power consuming features/functions of the
clothes dryer to reduce power consumption of the clothes dryer in
the energy savings mode; and, e) returning to the normal mode after
the peak demand period is over.
15. The clothes dryer control method according to claim 14, wherein
the delaying is selected from the group consisting of a delay in
start time, an extension of time to the delay start, stopping an
existing cycle and delaying a restart, finishing an existing cycle
and delaying a restart, and stopping after more than one cycle and
delaying a restart.
16. The clothes dryer control method according to claim 15, wherein
the adjusting of the functions of the clothes dryer is selected
from the group consisting of a reduction in target temperature in
one or more cycles, a disablement of one or more heaters in one or
more cycles, reduction in power to one or more heaters in one or
more cycles, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles.
17. The clothes dryer control method according to claim 14, wherein
the scheduling comprises a user interface that gives a user the
ability to select which of the one or more power consuming clothes
dryer functions are scheduled by the clothes dryer control system,
that receives a zip code entry which corresponds to a time of use
schedule of a utility company from which the clothes dryer control
system can determine on-peak mode hours and off-peak mode hours;
that uses a time versus day of the week schedule input method; that
receives a rate signal directly from the utility advising of the
current rate; and schedules activation of clothes dryer to off-peak
mode hours.
18. The clothes dryer control method according to claim 17, wherein
the adjusting of the functions comprises a user interface that
gives a user the ability to select which of the one or more power
consuming clothes dryer functions are used by the clothes dryer
control system and adjusts the clothes dryer functions during
off-peak hours.
19. The clothes dryer control method according to claim 18, wherein
the adjusting of the functions of the clothes dryer is selected
from the group consisting of a reduction in target temperature in
one or more cycles, a disablement of one or more heaters in one or
more cycles, reduction in power to one or more heaters in one or
more cycles, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles
20. The clothes dryer control method according to claim 14, wherein
the scheduling comprises a user interface that gives a user the
ability to select which of the one or more power consuming clothes
dryer functions are scheduled by the clothes dryer control system,
that receives a zip code entry which corresponds to a time of use
schedule of a utility company from which the clothes dryer control
system can determine on-peak mode hours and off-peak mode hours;
that uses a time versus day of the week schedule input method; that
receives a rate signal directly from the utility advising of the
current rate; and adjusts the clothes dryer functions during
on-peak mode hours.
21. The clothes dryer control method according to claim 20, wherein
the adjusting of the functions of the clothes dryer is selected
from the group consisting of a reduction in target temperature in
one or more cycles, a disablement of one or more heaters in one or
more cycles, reduction in power to one or more heaters in one or
more cycles, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles.
22. The clothes dryer control method according to claim 21, wherein
the delaying is selected from the group consisting of a delay in
start time, an extension of time to the delay start, stopping an
existing cycle and delaying a restart, finishing an existing cycle
and delaying a restart, and stopping after more than one cycle and
delaying a restart.
23. The clothes dryer control method according to claim 14, wherein
the energy signal has an associated energy cost and wherein the
controller is configured to override the operating mode of the
clothes drying appliance based on a user selected targeted energy
cost; wherein if current energy cost exceeds the user selected
cost, the controller operates the appliance in the energy savings
mode; and, wherein if the current energy cost is less than the user
selected cost, the controller operates the appliance in the normal
operating mode.
24. The clothes dryer control method according to claim 14, further
comprising a display communicating activation of the energy savings
mode.
25. The clothes dryer control method according to claim 24, wherein
the energy savings mode display includes a message selected from
the group consisting of `"ECO", "Eco", "EP", "ER", "CP", "CPP",
"DR", and "PP".
26. The clothes dryer control method according to claim 14, further
comprising: determining energy cost associated with the utility
state; displaying current cost of operating the clothes dryer
appliance; displaying current cost of supplied energy; and,
alerting a user of a peak demand period.
27. A clothes dryer comprising: a cabinet for receiving articles to
be dried; a fan for drawing air into the cabinet and circulating
air through the cabinet; a heater for heating air drawn into the
cabinet; and, a controller configured to control energization of
the drive system, fan and heater to selectively implement a
plurality of power consuming cycles, and to receive and process an
energy signal, the signal having a first state indicative of a
utility peak demand period and a second state indicative of a
utility off-peak demand period, the controller operating the
clothes dryer in one of an energy savings mode and a normal
operating mode based on the received signal being in the first and
second states respectively, the controller being configured to at
least one of selectively delay or alter one or more of the power
consuming cycles to reduce power consumption of the clothes dryer
in the energy savings mode.
28. The clothes dryer of claim 27, wherein the energy signal has an
associated energy cost and further including a display
communicating current cost of energy and current cost of operating
the clothes washer.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority from U.S.
Provisional Patent Application Ser. No. 61/097,082 filed 15 Sep.
2008, now Ser. No. ______, filed 15 Sep. 2009 (Attorney Docket No.
231,308 (GECZ 2 00948)); which provisional patent application is
expressly incorporated herein by reference, in its entirety. In
addition, cross-reference is made to commonly owned, copending
applications Ser. No. ______, filed 15 Sep. 2009 (Attorney Docket
No. 233326 (GECZ 00989)); Ser. No. ______, filed 15 Sep. 2009
(238022 (GECZ 2 00991)); Ser. No. ______, filed 15 Sep. 2009
(234622 (GECZ 2 00992)); Ser. No. ______, filed 15 Sep. 2009
(234930 (GECZ 2 00993)); Ser. No. ______, filed 15 Sep. 2009
(235012 (GECZ 2 00994)); Ser. No. ______, filed 15 Sep. 2009
(235215 (GECZ 2 00995)); Ser. No. ______, filed 15 Sep. 2009
(238338 (GECZ 2 00997)); Ser. No. ______, filed 15 Sep. 2009
(238404 (GECZ 2 00998)); Ser. No. ______, filed 15 Sep. 2009
(237845 (GECZ 2 00999)); Ser. No. ______, filed 15 Sep. 2009
(237898 (GECZ 2 01000)); and Ser. No. ______, filed 15 Sep. 2009
(238022 (GECZ 2 00996)).
BACKGROUND
[0002] This disclosure relates to energy management, and more
particularly to energy management of household consumer appliances.
The disclosure finds particular application to changing existing
appliances via add-on features or modules, and incorporating new
energy saving features and functions into new appliances.
[0003] Currently utilities charge a flat rate, but with increasing
cost of fuel prices and high energy usage at certain parts of the
day, utilities have to buy more energy to supply customers during
peak demand. Consequently, utilities are charging higher rates
during peak demand. If peak demand can be lowered, then a potential
huge cost savings can be achieved and the peak load that the
utility has to accommodate is lessened.
[0004] One proposed third party solution is to provide a system
where a controller "switches" the actual energy supply to the
appliance or control unit on and off. However, there is no active
control beyond the mere on/off switching. It is believed that
others in the industry cease some operations in a refrigerator
during on-peak time.
[0005] For example, in a refrigerator most energy is consumed to
keep average freezer compartment temperature at a constant level.
Recommended temperature level is based on bacteria multiplication.
Normally recommended freezer temperature for long (1-2 month) food
storage is 0 degrees F. Research shows that bacteria rise is a
linear function of the compartment temperature, i.e., the lower the
temperature the lower the bacteria multiplication. Refrigerator
designers now use this knowledge to prechill a freezer compartment
(and in less degree a refrigerator compartment also) before
defrost, thus keeping an average temperature during time interval
that includes before, during, and after defrost at approximately
the same level (for example, 0 degrees F.).
[0006] There are also currently different methods used to determine
when variable electricity-pricing schemes go into effect. There are
phone lines, schedules, and wireless signals sent by the electrical
company. One difficulty is that no peak shaving method for an
appliance such as a refrigerator will provide a maximal benefit.
Further, different electrical companies use different methods of
communicating periods of high electrical demand to their consumers.
Other electrical companies simply have rate schedules for different
times of day.
[0007] Electrical utilities moving to an Advanced Metering
Infrastructure (AMI) system will need to communicate to appliances,
HVAC, water heaters, etc. in a home or office building. All
electrical utility companies (more than 3,000 in the US) will not
be using the same communication method to signal in the AMI system.
Similarly, known systems do not communicate directly with the
appliance using a variety of communication methods and protocols,
nor is a modular and standard method created for communication
devices to interface and to communicate operational modes to the
main controller of the appliance. Although conventional
WiFi/ZigBee/PLC communication solutions are becoming commonplace,
this disclosure introduces numerous additional lower cost, reliable
solutions to trigger "load shedding" responses in appliances or
other users of power. This system may also utilize the commonplace
solutions as parts of the communication protocols.
BRIEF DESCRIPTION
[0008] The present disclosure reduces power consumption during
on-peak hours by reducing the energy demand on the power generation
facility, and also enabling the user/consumer to pay less to
operate the appliance on an annual basis. A controller is
configured to receive and process a signal indicative of current
state of an associated energy supplying utility. The controller
operates the cooking appliance in one of a plurality of operating
modes, including at least a normal operating mode and an energy
savings mode, in response to the received signal.
[0009] This disclosure is a low-cost alternative to using expensive
or complicated methods of determining when peak electrical rates
apply. For example, when the refrigerator is in peak shaving mode
(or it could be programmed to do this constantly), an ambient light
sensor determines when it is morning, and then stays in
energy-saving mode for a predetermined number of hours. Preferably,
the system will need a counter to know that the room has been dark
for a predetermined number of hours. When the lights come on for a
certain length of time, then the system knows, for example, that it
is morning. A state for an associated energy supplying utility is
determined. The utility state is indicative of at least a peak
demand period or an off-peak demand period.
[0010] This disclosure provides a peak-shaving appliance such as a
refrigerator, including a method to determine when to go into
peak-shaving mode without using additional components, or
components that have another purpose, and provides a high
percentage of the maximum benefit for negligible cost. The two
components needed for this are an ambient light sensor and a timer.
The kitchen will be dark for an extended period of time while
everyone is sleeping. The light sensor and the timer will be used
to determine that it is nighttime and morning can be determined by
the light sensor. When the refrigerator determines it is morning,
the timer will be used to initiate peak shaving mode after some
delay time. For example, peak shaving mode could start three hours
after it is determined morning starts. Similarly, the ambient light
sensor can also be used for dimming the refrigerator lights. This
disclosure advantageously uses ambient light to determine when to
start peak shaving. A controller is configured to receive and
process an energy signal. The signal has a first state indicative
of a utility peak demand period and a second state indicative of a
utility off-peak demand period. The controller operates the cooking
appliance in one of an energy savings mode and a normal operating
mode based on the received signal being in the first and second
states respectively.
[0011] An appliance interface can be provided for all appliances
leaving the module to communicate with the AMI system. The system
provides for appliance sales with a Demand Side Management capable
appliance. The Demand Side Management Module (DSMM) is provided to
control the energy consumption and control functions of an
appliance using a communication method (including but not limited
to PLC, FM, AM SSB, WiFi, ZigBee, Radio Broadcast Data System,
802.11, 802.15.4, etc.). The modular approach will enable an
appliance to match electrical utility communication requirements.
Each electrical utility region may have different communication
methods, protocol methods, etc. This modular approach allows an
appliance to be adapted to a particular geographical area of a
consumer or a particular electrical provider. The module can be
added as a follow on feature and applied after the appliance is
installed. Typical installations could include an integral mounted
module (inside the appliance or unit) or an externally mounted
module (at the wall electrical receptacle or anywhere outside the
appliance or unit). The module in this disclosure provides for 2
way communications if needed, and will provide for several states
of operation--for example, 1) normal operation, 2) operation in low
energy mode (but not off), and 3) operation in lowest energy
mode.
[0012] This module could be powered from the appliance or via a
separate power supply, or with rechargeable batteries. The
rechargeable batteries could be set to charge under off-peak
conditions. With the module powered from the appliance, the
appliance could turn it off until the appliance needed to make a
decision about power usage, eliminating the standby power draw of
the module. If powered separately, the appliance could go to a low
energy state or completely off, while the module continued to
monitor rates.
[0013] Use of RFID tags in one proposed system should offer
significant savings since the RFID tags have become very low cost
due to the proliferation of these devices in retail and will
effectively allow the enabled appliance to effectively communicate
with the utility meter (e.g., receive signals from the utility
meter). This system makes it very easy for a customer to manage
energy usage during peak demand periods and lowers the
inconvenience level to the customer by not shutting off appliances
in the home by the utility. When local storage and local generation
are integrated into the system, then cost savings are seen by the
customer. This system also solves the issue of rolling
brownouts/blackouts caused by excessive power demand by lowering
the overall demand. Also, the system allows the customer to
pre-program choices into the system that will ultimately lower
utility demand as well as save the customer money in the customer's
utility billing. For instance, the customer may choose to disable
the defrost cycle of a refrigerator during peak rate timeframes.
This disclosure provides for the controller to "communicate" with
the internal appliance control board and command the appliance to
execute specific actions with no curtailment in the energy supply.
This disclosure further provides a method of communicating data
between a master device and one or more slave devices using RFID
technology. This can be a number of states or signals, either using
one or more passive RFID tags that resonate at different
frequencies resonated by the master, or one or more active RFID
tags that can store data that can be manipulated by the master
device and read by the slave device(s). The states in either the
passive or active RFID tags can then be read by the microcontroller
on the slave device(s) and appropriate functions/actions can be
taken based upon these signals.
[0014] Another exemplary embodiment uses continuous coded tones
riding on carrier frequencies to transmit intelligence, for
example, when one is merely passing rate information such as rate
1, 2, 3, or 4, using the tones to transmit the signals. One could
further enhance the details of the messaging by assigning a binary
number to a given tone, thus allowing one to "spell out" a message
using binary coding with multiple tones. The appliance
microcomputer would be programmed to respond to a given number that
would arrive in binary format.
[0015] One advantage of this approach is that customers have
complete control of their power. There have been proposals by
utilities to shut off customers if they exceed demand limits or
increase the number of rolling brownouts. This method also gives a
customer finer granulity in their home in terms of control. A
customer does not have to load shed a room just to manage a single
device.
[0016] This disclosure also advantageously provides modes of load
shedding in the appliance, lighting, or HVAC other than "on/off" to
make the situation more acceptable from the perspective of the
customer.
[0017] In one aspect of the disclosure, a clothes dryer is provided
comprising one or more power consuming functions and a controller
in signal communication with an associated utility. The controller
can receive and process a signal from the associated utility
indicative of current cost of supplied energy. The controller
operates the clothes dryer in one of a normal operating mode and an
energy savings mode based on the received signal. The controller is
configured to change the power consuming functions by adjusting one
or more of an operation schedule, an operation delay, an operation
adjustment, and a selective deactivation of at least one of the one
or more power consuming functions to reduce power consumption of
the clothes dryer in the energy savings mode.
[0018] In another aspect of the disclosure, a method for
controlling a clothes dryer is provided, comprising: determining a
cost of supplied energy from an associated utility, the cost being
indicative of a peak demand period or an off-peak demand period;
operating the clothes dryer in a normal mode during the off-peak
demand period; operating the clothes dryer in an energy savings
mode during the peak demand period; scheduling, delaying, adjusting
and/or selectively deactivating any number of one or more power
consuming features/functions of the clothes dryer to reduce power
consumption of the clothes dryer in the energy savings mode; and,
returning to the normal mode after the peak demand period is
over.
[0019] An advantage of the present disclosure is the ability to
produce appliances with a common interface and let the module deal
with the Demand Side Management.
[0020] Another advantage is the ability to control functions and
features within the appliance and/or unit at various energy levels,
i.e., as opposed to just an on/off function.
[0021] Another advantage is that the consumer can choose the module
or choose not to have the module. If the module is chosen, it can
be matched to the particular electrical utility service provider
communication method of the consumer.
[0022] Another benefit is the increased flexibility with an
associated electrical service provider, and the provision of
several modes of operation (not simply an on/off mode). The module
can be placed or positioned inside or outside the appliance and/or
unit to provide demand side management.
[0023] Still other benefits relate to modularity, the ability to
handle multiple communication methods and protocols without
adversely impacting the cost of the appliance, opening up
appliances to a variety of protocols, enabling demand side
management or energy management, and/or providing for a standard
interface to the appliance (for example, offering prechill and/or
temperature set change during on-peak hours).
[0024] Low cost, reliable RF transmissions within the home, rather
than using industrial solutions such as PLC or Zigbee solutions
which are significantly more costly than the aforementioned
system.
[0025] Still other features and benefits of the present disclosure
will become apparent from reading and understanding the following
detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIGS. 1-21 illustrate exemplary embodiments of an energy
management system for household appliances.
[0027] FIG. 22 is a schematic illustration of an exemplary demand
managed clothes dryer.
[0028] FIG. 23 is an exemplary operational flow chart for the
clothes dryer of FIG. 22.
[0029] FIG. 24 is an exemplary control response for the clothes
dryer of FIG. 22.
DETAILED DESCRIPTION
[0030] In one embodiment, a more advanced system is provided to
handle energy management between the utility and the homeowner's
appliances. The system can include one or more of the following: a
controller, utility meter, communication network, intelligent
appliances, local storage, local generator and/or demand server.
Less advanced systems may actually allow the appliance to
"communicate directly with the utility meter or mesh network
through the DSSM (Demand Side Management Module) (FIG. 1). The
demand server is a computer system that notifies the controller
when the utility is in peak demand and what is the utility's
current demand limit. A utility meter can also provide the
controller the occurrence of peak demand and demand limit. The
demand limit can also be set by the home owner. Additionally, the
homeowner can choose to force various modes in the appliance
control based on the rate the utility is charging at different
times of the day. The controller will look at the energy
consumption currently used by the home via the utility meter and
see if the home is exceeding the demand limit read from the server.
If the demand limit is exceeded, the controller will notify the
intelligent appliances, lighting and thermostat/HVAC (FIG. 2).
[0031] Each intelligent appliance has a communication interface
that links itself to the controller (FIG. 3). This interface can be
power-line carrier, wireless, and/or wired. The controller will
interact with the appliance and lighting controls as well as
thermostat (for HVAC) to execute the users
preferences/settings.
[0032] Enabled appliances receive signals from the utility meter
and help lower the peak load on the utility and lower the amount of
energy that the consumer uses during high energy cost periods of
the day. There are several ways to accomplish this, through
wireless communication (ZigBee, WiFi, etc) or through PLC (power
line carrier) communication. Alternatively, using passive RFID tags
that resonate at different frequencies resonated by the master, or
one or more active RFID tags that can store data that can be
manipulated by the master device and read by the slave devices(s)
is an effective and potentially lower cost communication solution
since there is no protocol. Rather, a pulse of energy at a
particular frequency will allow a low cost method with an open
protocol for transmitting/communicating between a master device and
one or more slave devices, and appropriate functions/actions can be
taken based upon these signals.
[0033] The interaction between controller and appliances can occur
in two ways. For example, in one scenario during a peak demand
period, the controller will receive a demand limit from the
utility, demand server or user. The controller will then allocate
the home's demand based on two factors: priority of the appliance
and energy need level (FIG. 4). The priority dictates which
appliances have higher priority to be in full or partial energy
mode than other appliances. Energy need dictates how much energy is
required for a certain time period in order for that appliance to
function properly. If the appliance's energy need is too low to
function properly, the appliance moves to a normal mode or a higher
energy need level. The energy saving mode is typically a lower
energy usage mode for the appliance such as shutdowns of
compressors and motors, delayed cycles, higher operating
temperatures in summer or lower operating temperatures in winter
until the peak demand period is over. Once the demand limit is
reached, the appliances will stay in their energy mode until peak
demand is over, or a user overrides, or appliance finishes need
cycle or priority changes. The controller constantly receives
status updates from the appliances in order to determine which
state they are in and in order to determine if priorities need to
change to accomplish the system goals.
[0034] In a second scenario, for example, a set point is provided.
During a peak demand period, the controller will tell each
appliance to go into peak demand mode (FIG. 5). The appliance will
then go into a lower energy mode. The customer can deactivate the
energy savings mode by selecting a feature on the appliance front
end controls (i.e. user interface board) before or during the
appliance use or at the controller. The controller can also
communicate to a local storage or power generation unit. This local
unit is connected to the incoming power supply from the utility.
The controller notifies the storage unit to charge when it is not
in peak demand, if a storage unit is included and available. If the
storage unit has enough energy to supply the appliances during peak
demand, then the controller will switch the home's energy
consumption from the utility to the storage unit. The unit can also
be local generator/storage such as solar, hydrogen fuel cell,
etc.
[0035] The central controller handles energy management between the
utility and home appliances, lighting, thermostat/HVAC, etc. with
customer choices incorporated in the decision making process. The
controller may include notification of an energy saving mode based
on demand limit read from one or more of a utility meter, utility,
demand server or user. An energy savings mode of an appliance can
thereby be controlled or regulated based on priority and energy
need level sent from the controller and/or the customer (FIG. 6).
Likewise, consideration to use of local energy storage and use of a
local generator to offset peak demand limit can be incorporated
into the energy management considerations, or provide the ability
to override mode of energy savings through the controller or at the
appliance, lighting, or thermostat/HVAC (FIGS. 7 and 8).
[0036] The present disclosure has the ability for the home to shed
loads in pending brown-out or black-out situations, yet have
intelligence to prevent an improper action such as shutting down
the refrigerator for extended timeframes that might compromise food
storage safety.
[0037] How much energy the appliance consumes in peak demand is
based on priority of the device and the energy need level. If the
appliance's priority is high, then the appliance will most likely
not go into a saving mode. The energy need level is based on how
little energy the appliance can consume during peak demand and
still provide the function setting it is in (i.e. in a
refrigerator, ensuring that the temperature is cool enough to
prevent spoiling). It will also be appreciated that an appliance
may have multiple energy need levels.
[0038] The controller will be the main product with the
communication and settings control incorporated within future
appliances. Specific meters will be selected so that the controller
can read the demand usage. It is intended that the demand server
will possibly be purchased or leased to the utility.
[0039] A method is provided for constructing an appliance designed
to perform any key function, the appliance comprises of several
mechanical and electrical elements controlled by a main controller.
This main controller has a port for receiving information regarding
the operational state of the appliance. The port also has a user
interface or switch which could be used to override the information
received by the controller through the port. Two-way or one-way
communication devices may be connected to the port. These
communication devices will receive signals from a remote
controller, process those signals and as a result communicate an
operational state to the main controller of the appliance. This
operational state is communicated to the main controller by one or
more remote controllers in a specific format determined by the
appliance. These signals from the remote controller(s) could be
based on a variety of communication methods and associated
protocols. On receiving the operational state signal, the appliance
main controller causes the appliance to run a predetermined
operational mode. These operational modes are designed into the
appliance(s) and result in different resource consumption levels or
patterns, even delaying use. Resources could include energy, water,
air, heat, sunlight, time, etc. In future appliance models, the
consumer might be given the authority to modify the appliance
responses to a given rate signal. The consumer would be presented a
"check box" of potential response modes and allowed to choose
within set parameters. For instance, the consumer might be allowed
to choose the amount of temperature adjustment a refrigerator will
make in response to a high utility rate.
[0040] A method of communicating data between a master device and
one or more slave devices may advantageously use continuous
tone-coded transmission system. This can be a number of states or
signals, either using one or more continuous tones that signify
different rate states coming from the home area network (from
meter) or the utility. Additionally, one could send a combination
of tones to transmit binary messages using a few tones. The slave
devices will incorporate a receiver that receives the carrier
frequency and then decodes the continuous tone which corresponds to
the particular state of the utility rate. Once the "receiver board"
detects the tone, then the downstream circuitry will trigger the
appropriate response in the appliance. The carrier frequency in
this scheme can be numerous spectrums, one being the FM broadcast
band or a specific FM band allocated by the FCC for low level power
output. The advantage of broadcast band FM is the low cost of such
devices and the potential to penetrate walls, etc. within a home
with very low levels of power due to the long wavelength of the
89-106 Mhz carrier. This process is used today in 2-way radio
communications to reduce the annoyance of listening to multiple
users on shared 2-way radio frequencies. The process in these
radios is referred to as CTCSS (continuous tone-coded squelch
system) and would find application in this end use.
[0041] Generally, it is not known to have modular interfaces that
can receive signals from a control source. Also, no prior
arrangements have functioned by addressing the control board of the
appliance with a signal that directs the appliance to respond.
[0042] Thus, by way of example only, the structure and/or operation
of a refrigerator (FIG. 9, although other appliances are also
represented) may be modified or altered by reducing the
temperature, especially in the freezer compartment pre on-peak time
and further temporarily provide a compartment temperature increase
to shave on-peak load. Specifically, defrost operation could be
delayed until off-peak time. Alternatively or conjunctively, the
freezer and refrigerator temperature setpoints may be set to
maintain less compressor on time during on-peak demand times.
Similarly, the refrigerator/freezer could be programmed so that
lights will not be permitted to come on or the lights must be
dimmed lights during on-peak demand times. During on-peak demand
times, the fan operating speeds can be reduced, and/or compressor
operating speed reduced in order to reduce energy consumption.
Still another option is to reduce the delay time for the door alarm
to sound during on-peak time. Other power load reducing measures in
a refrigerator may include (reducing before on-peak hours) the
temperature of the freezer and refrigerator compartments in a
refrigerator (prechill) and slightly increase temperature setting
during on-peak rates. For example, just before peak rate time, the
temperature setting could be decreased by 1-2 degrees (during
off-peak rates). Some communication line with the electrical
company could be established. Thus, the electrical company may be
able to send a signal in advance to prechill the refrigerator (or
in the case of an air conditioner, decrease the room temperature
during off-peak rates as a pre-chill maneuver) and, in turn,
increase the temperature setting during on-peak rates.
[0043] Still other energy consuming practices of the exemplary
refrigerator that may be altered include turning the ice-maker off
during on-peak demand times, or disabling the crushed ice mode
during on-peak demand times. Alternatively, the consumer may be
given the ability to select via a user interface which items are
incorporated into the on-peak demand via an enable/disable menu, or
to provide input selection such as entry of a zip code (FIG. 10) in
order to select the utility company and time of use schedule (FIG.
11), or using a time versus day of the week schedule input method
(FIGS. 12-13).
[0044] The user interface may also incorporate suggested energy
saving tips or show energy usage, or provide an indicator during
on-peak mode, or provide a counter to illustrate the energy impact
of door opening, or showing an energy calculator to the consumer to
serve as a reminder of the impact of certain selections/actions on
energy use or energy conservation (FIGS. 14-19).
[0045] One path that is being pursued from the appliance
perspective is to allow the onboard CPU (microprocessor) of the
appliance to determine how to respond to an incoming signal asking
for a load shedding response. For example, the CPU will turn on,
turn off, throttle, delay, adjust, or modify specific functions and
features in the appliance to provide a turndown in power
consumption (FIG. 20). FIG. 21 defines specifically exemplary modes
of what are possible. The main feature here is the enabling of the
main board microprocessor or CPU to execute actions in the
appliance to deliver load shedding (lowering power consumption at
that instant). The actions available in each appliance are only
limited to the devices that the CPU has control over, which are
nearly all of the electrical consuming devices in an appliance.
This may work better where the appliance has an electronic control
versus an electromechanical control.
[0046] Of course, the above description focuses on the refrigerator
but these concepts are equally applicable to other home appliances
such as dishwasher, water heaters, washing machines, clothes
dryers, televisions (activate a recording feature rather than
turning on the television), etc., and the list is simply
representative and not intended to be all encompassing.
[0047] Likewise, although these concepts have been described with
respect to appliances, they may find application in areas other
than appliances and other than electricity usage. For example, a
controller that acts as an intermediary between the utilities meter
and the appliance interprets the utility signal, processes it and
then submits this signal to the appliance for the prescribed
reaction. In a similar fashion, the controller may find application
to other household utilities, for example, natural gas and water
within the home. One can equip the water and gas meters to measure
flow rates and then drive responses to a gas water heater or gas
furnace precisely like the electrical case. This would assume that
one might experience variable gas and water rates in the future.
Secondly, the flow meters being connected to the controller could
provide a consumer with a warning as to broken or leaking water
lines by comparing the flow rate when a given appliance or
appliances are on to the normal consumption. In cases where safety
is a concern, the system could stop the flow of gas or water based
on the data analysis.
[0048] Another feature might be the incorporation of "remote
subscription" for the utility benefit. In some cases, the utility
will be providing customers discounts/rebates for subscribing to
DSM in their appliances, hot water heaters, etc. The "remote
subscription" feature would allow the utility to send a signal that
would "lockout" the consumer from disabling the feature since they
were on the "rebate" program.
[0049] Another feature that the controller lends itself to is the
inclusion of "Remote diagnostics". This feature would allow the
appliance to send a signal or message to the controller indicating
that something in the appliance was not up to specifications. The
controller could then relay this signal to the utility or to the
appliance manufacturer via the various communication avenues
included into the controller (i.e., WIFI, WIMAX, Broadband, cell
phone, or any other formats that the controller could "speak").
[0050] In the case of a remote subscription, the utilities today
rely on the honesty of their subscribers to leave the DSM system
functional. Some people may receive the discounts/rebate and then
disable the feature that drives the load shedding. With this
system, the utility can ensure that the feature will be enabled and
provide the proper load shedding.
[0051] An exemplary embodiment of a demand managed appliance 100
comprising a clothes dryer 110 is schematically illustrated in FIG.
22. The clothes dryer 110 comprises at least one power consuming
feature/function 102 and a controller 104 operatively associated
with the power consuming feature/function. The controller 104 can
include a micro computer on a printed circuit board which is
programmed to selectively control the energization of the power
consuming feature/function. The controller 104 is configured to
receive and process a signal 106 indicative of a utility state, for
example, availability and/or current cost of supplied energy. The
energy signal may be generated by a utility provider, such as a
power company, and can be transmitted via a power line, as a radio
frequency signal, or by any other means for transmitting a signal
when the utility provider desires to reduce demand for its
resources. The cost can be indicative of the state of the demand
for the utility's energy, for example a relatively high price or
cost of supplied energy is typically associated with a peak demand
state or period and a relative low price or cost is typically
associated with an off-peak demand state or period.
[0052] The controller 104 can operate the clothes dryer 110 in one
of a plurality of operating modes, including a normal operating
mode and an energy savings mode, in response to on the received
signal. Specifically, the clothes dryer 110 can be operated in the
normal mode in response to a signal indicating an off-peak demand
state or period and can be operated in an energy savings mode in
response to a signal indicating a peak demand state or period. As
will be discussed in greater detail below, the controller 104 is
configured to at least selectively adjust and/or disable the power
consuming feature/function to reduce power consumption of the
clothes dryer 110 in the energy savings mode.
[0053] The clothes dryer 110 generally includes a cabinet 112 and a
control panel or user interface 116. The clothes dryer 110 may be
of conventional construction, further including a drum 113
rotatably mounted in the cabinet 112 for receiving articles to be
dried. Instructions and selections are displayed on the display
118. A light source 124 is provided for illuminating the user
interface 116. Drum 113 is rotatably driven by a motor (not shown)
to tumble articles in the drum. The motor and associated drive
system may be able to rotate the drum at a single speed, or a drive
system with multiple speeds may be employed. A fan (not shown) is
provided within the case 112 to draw air into the case and
circulate it through the drum to dry or freshen the clothes in the
drum. The fan also may be of a single speed or multiple speed
design. A heater is provided to heat the circulating air, which may
be on or more electric resistive or radiant heating elements, one
or more gas burners. One or more dryness sensors are provided to
detect the relative moisture content of the clothes to control the
duration of the drying cycles to enable automatic determine the
duration of a drying cycle. Controller 104 is configured with a
plurality of clothes drying algorithms preprogrammed in the memory
to implement user selectable cycles for drying a variety of types
and sizes of clothes loads. The cycles may of automatically
determined duration, influenced by user selection of a desired
degree of dryness. Drying cycles of fixed duration selected by the
user are also enabled. Each such cycle is a power consuming
feature/function involving energization of a drive motor, a fan
motor and a heater, and possibly other components such as a light
illuminating the interior of the dryer at least when the dryer door
is open. The control panel 116 can include a display 118 and
control buttons for making various operational selections. Drying
algorithms can be preprogrammed in the memory for many different
types of cycles. Instructions and selections are displayed on the
display 118. A light source 124 is provided for illuminating the
user interface 116.
[0054] As described above, appliances can be delayed in their
operation, rescheduled for a later start time, and/or altered in
their functioning/features in order to reduce energy demands. Some
appliances lend themselves to an altered operational schedule to
off-peak demand periods due to their functionality. For example,
dishwashers, clothes washers, and clothes dryers all have the
capacity to run at off-peak hours because demand on these
appliances is either not constant and/or the functions of these
appliances are such that immediate response is not necessary. As
one illustrative example, a clothes dryer that has been loaded
during the daytime, i.e., on-peak demand period hours, can be
programmed to start its operations for a later, albeit off-peak
demand hours. It is to be appreciated that on-peak and off-peak
demand hours can correspond to high utility costs and relatively
low utility costs ($/kilowatt), respectively. In this manner,
clothes can be dried using energy during the off-peak demand period
wherein the subsequently dried clothes become available either
later in the present day or at a time the following day. As most
users can appreciate, particularly for household consumers,
immediate drying of clothes is many times not necessary.
[0055] In order to reduce the peak energy consumed by a clothes
dryer, modifications and/or delays of individual clothes dryer
cycles can be adjusted in order to reduce the total energy
consumed. Reducing total energy consumed also encompasses reducing
the energy consumed at peak times and/or reducing the overall
electricity demands during peak times and non-peak times.
Electricity demand can be defined as average watts over a short
period of time, typically 5-60 minutes
[0056] Changes or adjustments to the clothes dryer's scheduled time
for which cycles begin can be varied in a number of ways. Delaying
or modifying the clothes dryer's cycle schedule can be in response
to a signal from the controller 104 for the appliance to conserve
energy or can be at the user's/consumer's commands. The appliance
controller 104 can be in communication with an associated utility
where the controller 104 receives and processes a signal from the
associated utility indicative of current costs of supplying energy.
The appliance controller 104 can be in communication with another
appliance, `master` appliance, or `master` controller that is in
communication with an associated utility. The controller 104 can
then operate the clothes dryer in one of a normal operating mode
and an energy savings mode based on the received signal. The
controller 104 can be configured to change the power consuming
functions by adjusting one or more of an operation schedule, an
operation delay, an operation adjustment, and a selective
deactivation of at least one of the one or more power consuming
functions to reduce power consumption of the clothes dryer in the
energy savings mode. In order to reduce the peak energy consumed by
the clothes dryer 110, the controller 104 is configured to
selectively adjust and/or disable at least one of the one or more
power consuming features/functions to reduce power consumption of
the clothes dryer 110 in the energy savings mode. To this extent,
the controller 104 is configured to reduce power levels in the
energy savings mode. The controller 104 is also configured to
reduce functions and/or reduce the intensity of functions in the
energy savings mode.
[0057] It is to be appreciated that energy savings mode can be
accomplished by adjusting operation functions/features during on
peak demand periods, delaying or rescheduling operations to an off
peak demand period, and through a combination of both adjustment of
operations and rescheduling to off peak demands. Off peak demand
periods correspond to periods during which lower cost energy is
being supplied by the utility relative to peak demand periods
during identifiable periods.
[0058] Changing the start of an appliance operation can be through
a delay in start time or a rescheduling to a particular time
period. Operational delays include one or more of a delay in start
time, an extension of time to the delayed start, stopping an
existing cycle and delaying a restart, finishing an existing cycle
and delaying a restart (or start or subsequent cycle), and stopping
after more than one cycle and delaying a restart. The stopping
after more than one cycle can comprise advancing through one or
more cycles until a logical stop is reached and then delaying any
further operations until off-peak mode hours. The logical stop can
include before an additional drying cycle, temperature change to a
subsequent drying cycle, etc. In this manner, operations can either
be delayed before they are initiated and/or they can be stopped
after they have been initiated and restarted at a later time. For
some functions, i.e., a heavy duty dry cycle, it may be
advantageous to finish an existing dry cycle and delaying a restart
of any subsequent cycles to an off peak demand period. In this
manner, the clothes dryer's cycles effectively operate "normally"
but can be delayed wherein one or more of the cycles are
stopped/delayed and restarted/started during a non-peak demand
period.
[0059] Alternatively, or in conjunction with the above operational
delays, an operational schedule can be initiated wherein a user
interface gives a user the ability to select which of the one or
more clothes dryer functions are to be scheduled by the clothes
dryer control system at non-peak mode hours. Additionally, the
clothes dryer control system can receive a zip code entry which
corresponds to a time of use schedule of a utility company from
which the clothes dryer control system can determine on-peak mode
hours and off-peak mode hours. The information can use a time
versus day of the week schedule input method that receives a cost,
or price, per i.e. kilowatt hour signal directly from the utility
advising of the current costs and schedules activation of the
clothes dryer to off-peak mode hours.
[0060] A control method in accordance with the present disclosure
comprises determining a cost of supplying energy from the
associated utility, the cost being indicative of a peak demand
period or an off-peak demand period, operating the clothes dryer in
a normal mode during the off-peak demand period, operating the
clothes dryer in an energy savings mode during the peak (or
off-peak) demand period, scheduling, delaying, adjusting and/or
selectively deactivating any number of one or more power consuming
features/functions of the clothes dryer to reduce power consumption
of the clothes dryer in the energy savings mode, and returning to
the normal mode after the peak demand period is over. Off peak
demand periods correspond to periods during which lower cost energy
is being supplied by the utility relative to peak demand
periods.
[0061] In conjunction with the scheduling delays described above,
or as separate operational changes, the following operation
adjustments can be selected in order to reduce energy demands. The
operation adjustments to be described hereinafter, can be
implemented in conjunction with off-peak mode hours and/or can be
implemented during on-peak mode hours. Associated with a clothes
dryer, the operational adjustments can include one or more of the
following: a reduction in operating temperature (i.e. temperature
set point adjustments) in one or more cycles, a disablement of one
or more heaters in one or more cycles, reduction in power to one or
more heaters, a switch from a selected cycle to a reduced power
consumption cycle, a reduction in a duration of cycle time in one
or more cycles, a disablement of one or more cycles, and a skipping
of one or more cycles. Illustratively, a switch from a selected
cycle to a reduced power consumption cycle could include a change
to the cycle definition when a command is received. For example, if
a customer/user pushes "normal dry" cycle, the selected cycle would
then switch to a "permanent press" cycle, or the customer/user
pushes "permanent press" cycle which would then switch to a
"delicate/light" cycle. As described, the switching is in response
to lowering the energy demands from a selected cycle to a reduced
power consumption cycle that meets a similar functional cycle.
[0062] With reference to FIG. 23, a control method in accordance
with the present disclosure comprises communicating with an
associated utility and receiving and processing the signal
indicative of cost of supplied energy (S200), determining a state
for an associated energy supplying utility, such as a cost of
supplying energy from the associated utility (S202), the utility
state being indicative of at least a peak demand period or an
off-peak demand period (S203), operating the clothes dryer 110 in a
normal mode during the off-peak demand period (S204), operating the
clothes dryer 110 in an energy savings mode during the peak demand
period (S206), selectively adjusting any number of one or more
power consuming features/functions of the clothes dryer to reduce
power consumption of the appliance in the energy savings mode
(S208), and returning to the normal mode (S210) after the peak
demand period is over (S212). The selective adjustment can include
reducing power in the energy savings mode, for example, selecting
one or more of the operational adjustments described above.
[0063] It is to be appreciated that a selectable override option
can be provided on the user interface 116 providing a user the
ability to select which of the one or more power consuming
features/functions are adjusted by the controller in the energy
savings mode. The user can override any adjustments, whether time
related or function related, to any of the power consuming
functions. The override option can be initiated at any time or can
be initiated based on a certain $/kilowatt hour. For the method
outlined in FIG. 23, if the utility state has an associated energy
cost, the user can select a targeted energy cost (S214) and can
base operation of the appliance on the selected targeted energy
cost. If the current cost of energy is above the user selected cost
(S216), then energy savings mode (S206) is initiated. If the
current cost of energy is below the user selected cost, then the
appliance continues to operate in normal mode (S204). The
operational adjustments, particularly an energy savings operation
can be accompanied by a display on the panel which communicates
activation of the energy savings mode. The energy savings mode
display can include a display of "ECO", "Eco", "EP", "ER", "CP",
"CPP", "DR", or "PP" on the appliance display panel 118 in cases
where the display is limited to three characters. In cases with
displays having additional characters available, messaging can be
enhanced accordingly. Additionally, an audible signal can be
provided to alert the user of the appliance operating in the energy
savings mode.
[0064] The duration of time that the clothes dryer 110 operates in
the energy savings mode may be determined by information in the
energy signal 106. For example, the energy signal 106 may inform
the clothes dryer 110 to operate in the energy savings mode for a
few minutes or for one hour, at which time the appliance returns to
normal operation. Alternatively, the energy signal 106 may be
continuously transmitted by the utility provider, or other signal
generating system, as long as it is determined that instantaneous
load reduction is necessary. Once transmission of the signal 106
has ceased, the clothes dryer 110 returns to normal operating mode.
In yet another embodiment, an energy signal may be transmitted to
the clothes dryer to signal the clothes dryer to operate in the
energy savings mode. A normal operation signal may then be later
transmitted to the clothes dryer to signal the clothes dryer to
return to the normal operating mode.
[0065] The operation of the clothes dryer 110 may vary as a
function of a characteristic of the supplied energy, e.g.,
availability and/or price. Because some energy suppliers offer what
is known as time-of-day pricing in their tariffs, price points
could be tied directly to the tariff structure for the energy
supplier. If real time pricing is offered by the energy supplier
serving the site, this variance could be utilized to generate
savings and reduce chain demand. Another load management program
offered by energy supplier utilizes price tiers which the utility
manages dynamically to reflect the total cost of energy delivery to
its customers. These tiers provide the customer a relative
indicator of the price of energy and are usually defined as being
LOW (level 1), MEDIUM (level 2), HIGH (level 3), and CRITICAL
(level 4). These tiers are shown in the chart of FIG. 24 to
partially illustrate operation of the clothes dryer 110 in each
pricing tier. In the illustrative embodiment the appliance control
response to the LOW and MEDIUM tiers is the same namely the
appliance remains in the normal operating mode. Likewise the
response to the HIGH and CRITICAL tiers is the same, namely
operating the appliance in the energy saving mode. However, it will
be appreciated that the controller could be configured to implement
a unique operating mode for each tier which provides a desired
balance between compromised performance and cost savings/energy
savings. If the utility offers more than two rate/cost conditions,
different combinations of energy saving control steps may be
programmed to provide satisfactory cost savings/performance
tradeoff. The operational and functional adjustments described
above, and others, can be initiated and/or dependent upon the
tiers. For example, the clothes dryer's highest heat setting
selection can be prevented or `blocked` from activating if the
pricing tier is at level 3 or 4. In one exemplary arrangement, the
controller resets the drying temperature to a lower setting, i.e.
using only the outer heating coil which essentially uses one half
of the wattage when compared to full use of the heating coil. The
display 118 can include, a communication, for example, an audible
and/or visual alert of pricing tier 3 and 4. Some communication
line with the utility can be established including, but not limited
to, the communication arrangements hereinbefore described. In
addition, the display 118 can provide the actual cost of running
the clothes dryer 110 in the selected mode of operation, as well
as, maintain a running display of the present cost of energy. If
the utility offers more than two rate/cost conditions, different
combinations of energy saving control steps may be programmed to
provide satisfactory cost savings/performance tradeoff.
[0066] The invention has been described with reference to the
preferred embodiments. Obviously, modifications and alterations
will occur to others upon reading and understanding the preceding
detailed description. It is intended that the invention be
construed as including all such modifications and alterations.
* * * * *