U.S. patent application number 12/012101 was filed with the patent office on 2008-06-05 for refrigerant monitoring system and method.
This patent application is currently assigned to ASP CORPORATION. Invention is credited to John Bryan Beatenbough, Ryan Edward Haley, Edward Rios.
Application Number | 20080127660 12/012101 |
Document ID | / |
Family ID | 34396553 |
Filed Date | 2008-06-05 |
United States Patent
Application |
20080127660 |
Kind Code |
A1 |
Beatenbough; John Bryan ; et
al. |
June 5, 2008 |
Refrigerant monitoring system and method
Abstract
A system for monitoring the amount of refrigerant supplied from
a refrigerant tank to a plurality of refrigerant systems comprising
a tank valve for connection to a refrigerant tank at a
predetermined location. A rack of refrigerant rack lines is routed
from the location to the refrigerant systems for connecting the
tank valve and refrigerant to the refrigerant systems. Rack valves
are disposed in the refrigerant rack lines for controlling the flow
of refrigerant through the rack lines to a selected refrigerant
system. A sensor for determining the amount of refrigerant supplied
from the refrigerant tank to a refrigerant system and recording the
supplied amount of refrigerant. The system controller controls the
rack valves and tank valve to selectively connect the supply of
refrigerant in the refrigerating tank with a selected refrigerant
system so that the amount of refrigerant delivered to the
refrigerant system is recorded by the system controller.
Inventors: |
Beatenbough; John Bryan;
(Anderson, SC) ; Rios; Edward; (Hartwell, GA)
; Haley; Ryan Edward; (Hartwell, GA) |
Correspondence
Address: |
MCNAIR LAW FIRM, P.A.
P.O. BOX 10827
GREENVILLE
SC
29603-0827
US
|
Assignee: |
ASP CORPORATION
Hartwell
GA
|
Family ID: |
34396553 |
Appl. No.: |
12/012101 |
Filed: |
January 31, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11153796 |
Jun 15, 2005 |
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12012101 |
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10848764 |
May 19, 2004 |
6952931 |
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11153796 |
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60509103 |
Oct 6, 2003 |
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Current U.S.
Class: |
62/149 |
Current CPC
Class: |
F25B 45/00 20130101;
F25B 2345/007 20130101; F25B 2400/22 20130101; F25B 2345/001
20130101 |
Class at
Publication: |
62/149 |
International
Class: |
F25B 45/00 20060101
F25B045/00 |
Claims
1. A system for monitoring the amount of refrigerant used in
refrigerant systems comprising: a housing; an electronic weight
scale carried in the housing for supporting a refrigerant tank
containing a supply of refrigerant and generating weight signals
corresponding to the amount of refrigerant in said refrigerant
tank; a tank valve carried in the housing for connection to said
refrigerant tank when placed on said weight scale; a rack of
refrigerant rack lines routed from said housing to the refrigerant
systems for connecting said tank valve to said refrigerant systems;
rack valves carried in said refrigerant rack lines for controlling
the flow of refrigerant through said rack lines to a selected
refrigerant system; a system controller in communication with said
electronic scale for receiving said weight signals from said weight
scale; and said controller controlling said rack valves and tank
valve to selectively connect the supply of refrigerant in the
refrigerating tank with a selected refrigerant system so that the
amount of refrigerant delivered to the refrigerant system is
recorded by said system controller.
2. The system of claim 1 including an input device for inputting
into said controller.
3. The system of claim 2 including a display in communication with
said controller for displaying the quantity of refrigerant supplied
to a refrigerant system.
4. The system of claim 1 wherein said housing includes a door
moveable between an open position and a closed position; and
including a door sensor for determining whether the door is closed
to generate a door closed signal.
5. The system of claim 4 wherein said controller includes a
computer readable medium, a set of computer readable instructions
in communication with said computer readable medium having
operating instructions for operating said system during delivery of
refrigerant to said refrigerant systems.
6. The system of claim 5 wherein said operating instructions
include instructions for preventing the operation of the system
unless a door closed signal is received by the controller.
7. The system of claim 5 wherein said operating instructions
include instructions for storing the amount of refrigerant
indicated by said weight signal with the time and date of the
delivery of refrigerant to the refrigerant system.
8. The system of claim 5 wherein said operating instructions
include: instructions for receiving a selection signal indicating
which rack line to supply refrigerant through; instructions for
opening a rack valve corresponding to the rack line desired to be
charged with refrigerant; instructions for opening the tank valve;
instructions for receiving the weight signal of the refrigerant
being supplied through the rack line; and instructions for closing
said tank valve and the selected rack valve in response to
receiving a stop signal, and recording the final weight signal at
the time the stop signal is received.
9. The system of claim 8 wherein said set of computer readable
instructions includes instructions for storing and displaying an
initial weight signal prior to opening said rack valve and said
tank valve, for storing and displaying the final weight, and for
processing the initial and final weight signals to determine the
amount of refrigerant delivered to said refrigerant system.
10. The system of claim 8 including instructions for receiving a
weight signal and storing the current refrigerant weight in said
computer readable memory after said tank valve is closed.
11. The system of claim 10 including instructions for pumping down
the selected rack line for a predetermined length of time after
said tank valve is closed.
12. The system of claim 10 including instructions for
electronically transmitting data representing the amount of
refrigerant delivered to the refrigerant system, and the time and
date of the delivery.
13. The system of claim 10 including instructions for creating a
transaction file containing the amount of refrigerant delivered to
the refrigerant system, and the time and date of the delivery, and
electronically transmitting said transaction file.
14. A system for monitoring the amount of refrigerant supplied from
a refrigerant tank to a refrigerant system comprising: a tank valve
for connection to a refrigerant tank at a predetermined location; a
sensor for determining the amount of refrigerant supplied from said
refrigerant tank to a selected refrigerant system and generating a
signal as a function of the supplied amount of refrigerant; a
system controller in communication with said sensor for receiving
said signals from said sensor; and said controller controlling said
tank valve to connect the refrigerant tank with a selected
refrigerant system so that the amount of refrigerant delivered to
the refrigerant system is recorded by said system controller.
15. The system of claim 14 including an input device for inputting
into said controller.
16. The system of claim 14 including a display in communication
with said controller for displaying the quantity of refrigerant
supplied to a refrigerant system.
17. The system of claim 14 further comprising a housing wherein
said housing includes a door moveable between an open position and
a closed position; and including a door sensor for determining
whether the door is closed to generate a door closed signal.
18. The system of claim 14 wherein said controller includes a
computer readable medium, a set of computer readable instructions
in communication with said computer readable medium having
operating instructions for operating said system during delivery of
refrigerant to said refrigerant systems.
19. The system of claim 14 wherein said operating instructions
include instructions for preventing the operation of the system
unless a door closed signal is received by the controller.
20. The system of claim 14 wherein said operating instructions
include instructions for storing the amount of refrigerant
indicated by said weight signal with the time and date of the
delivery of refrigerant to the refrigerant system.
21. The system of claim 14 wherein said operating instructions
include instructions for opening the tank valve; instructions for
receiving the weight signal of the refrigerant being supplied to
the line; and instructions for closing said tank valve in response
to receiving a stop signal and recording the final weight signal at
the time the stop signal is received.
22. The system of claim 14 including instructions for receiving a
weight signal and storing the current refrigerant weight in said
computer readable medium after said tank valve is closed.
23. The system of claim 14 further comprising a rack of refrigerant
rack lines routed from said location to the refrigerant systems for
connecting said tank valve and refrigerant tank to said refrigerant
systems.
24. The system of claim 23 further comprising rack valves disposed
in said refrigerant rack lines for controlling the flow of
refrigerant through said rack lines to a selected refrigerant
system.
25. The system of claim 24 wherein said controller controls said
rack valves and said tank valve to selectively connect the
refrigerant tank with a selected refrigerant system.
26. The system of claim 24 wherein said operating instructions
include: instructions for receiving a selection signal indicating
which rack line to supply refrigerant through; instructions for
opening a rack valve corresponding to the rack line desired to be
charged with refrigerant; instructions for opening the tank valve;
instructions for receiving the weight signal of the refrigerant
being supplied through the rack line; and instructions for closing
said tank valve and the selected rack valve in response to
receiving a stop signal, and recording the final weight signal at
the time the stop signal is received.
27. The system of claim 24 wherein said set of computer readable
instructions includes instructions for storing and displaying an
initial weight signal prior to opening said rack valve and said
tank valve, for storing and displaying the final weight, and for
processing the initial and final weight signals to determine the
amount of refrigerant delivered to said refrigerant system.
28. The system of claim 24 including instructions for receiving a
weight signal and storing the current refrigerant weight in said
computer readable medium after said tank valve is closed.
29. The system of claim 24 including instructions for pumping down
the selected rack line for a predetermined length of time after
said tank valve is closed.
30. The system of claim 24 including instructions for
electronically transmitting data representing the amount of
refrigerant delivered to the refrigerant system, and the time and
date of the delivery.
31. The system of claim 24 including instructions for creating a
transaction file containing the amount of refrigerant delivered to
the refrigerant system, and the time and date of the delivery, and
electronically transmitting said transaction file.
32. A method for monitoring the amount of refrigerant used by
refrigerant systems providing a computerized monitoring system
having a rack of refrigerant lines connected to refrigerant systems
desired to be charged with a refrigerant from a refrigerant tank
wherein control valves are disposed in the refrigerant lines
comprising the steps of: electronically opening a selected control
valve corresponding to a refrigerant line connected to a
refrigerant system to be supplied refrigerant from the refrigerant
tank; sensing the weight of the refrigerant tank before opening the
control valve and storing that weight in a memory of the
controller; stopping the supply of refrigerant from the refrigerant
tank to the refrigerant system; recording the weight of the
refrigerant tank; and, processing the initial and final weights to
determine the amount of refrigerant supplied to the refrigerant
system, and storing the refrigerant amount on a computer readable
medium.
33. The method of claim 32 further comprising the step of
electronically transmitting data indicting the amount of
refrigerant supplied to the refrigerant system.
34. The method of claim 32 further comprising the step of
displaying an initial weight signal prior to opening a rack valve,
storing the initial weight, storing and displaying the final
weight.
35. The method of claim 32 further comprising the step of pumping
down the selected rack line for a predetermined length of time
after the tank valve is closed.
36. The method of claim 32 further comprising the step of creating
a transaction file containing the amount of refrigerant delivered
to the refrigerant system, and the date and time of the delivery.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims priority from a provisional
application filed Oct. 6, 2003, under Ser. No. 60/509,103, having
the same title, now abandoned, utility application filed May 19,
2004 under Ser. No. 10/848,764, having the same title, now U.S.
Pat. No. 6,952,931 issued Oct. 11, 2005, and utility application
filed Jun. 15, 2006 under Ser. No. 11/153,796, having the same
title, currently pending.
FIELD OF THE INVENTION
[0002] This invention is directed to a system and method for
metering refrigerant in commercial refrigerant systems and the
like, and more particularly, to a computerized system and method
that uses an electronic scale to measure dispensed refrigerant and
generate an accounting history of refrigerant used for refrigerant
systems.
BACKGROUND OF THE INVENTION
[0003] The use of refrigerant systems for cooling of food and
beverages in supermarkets and super stores, storage of food and
materials in manufacturing and processing plants, etc. creates a
major problem in maintaining the systems, and keeping the systems
properly charged with a refrigerant. Release of the refrigerant
into the atmosphere is detrimental to the environment and is a
problem that needs to be regulated. The Environmental Protection
Agency (EPA) is demanding more and more accounting of refrigerant
quantities supplied and used by these large users in order to
determine irregular consumption and possible refrigerant
leakages.
[0004] Typically, when a refrigerant system needs more refrigerant,
a technician comes with a tank of refrigerant and connects the tank
to the refrigerant's system. Once the tank is connected, the system
begins receiving refrigerant from the tank. The traditional method
for measuring the amount of refrigerant that has been put into the
system from the tank is the technician lifting the tank and
estimating the weight of the refrigerant that has been entered into
the system. While the inaccuracy that can exist from measuring
refrigerant in this manner may seem insignificant, when looked at
on a much larger scale it becomes much more significant. For
example, a nationwide grocery store chain could have several
hundreds of thousands of refrigerant systems. If that grocery store
chain is over-paying by even a small amount per each system, then
when multiplied by the hundreds of thousands of systems they have
then it can be a quite significant amount.
[0005] Because of new federal accounting standards for the amount
of refrigerant being placed into refrigerant systems, large
companies need to have accurate numbers for how much refrigerant is
being placed or lost in their systems on a daily basis. Having this
accurate accounting will keep corporations from having problems or
violations under the EPA. The accurate measurement and accounting
will also allow corporations to determine if they have any leaks in
their system and correct these leaks. Correcting these leaks not
only cuts cost but is also of benefit to the environment.
[0006] Accordingly, an object of the present invention is to
provide a system and method for accurately monitoring the amount of
refrigerant put into a refrigerant system.
[0007] Another object of the present invention is to provide a
system and method for accurately monitoring refrigerant that goes
into multiple refrigerant systems.
[0008] Still another object of the present invention is to provide
a system and method for accurately monitoring and accounting the
amount of refrigerant put into a refrigerant system.
SUMMARY OF THE INVENTION
[0009] The above objectives are accomplished according to the
present invention by providing a system for monitoring the amount
of refrigerant used in refrigerant systems comprising a housing;
and an electronic weight scale in the housing for supporting a
refrigerant tank containing a supply of refrigerant and generating
weight signals corresponding to the amount of refrigerant in the
refrigerant tank. A tank valve is carried in the housing for
connection to the refrigerant tank when placed on the weight scale.
A refrigerant line rack includes a plurality of refrigerant rack
lines routed from the housing to the refrigerant systems for
connecting the tank valve to the refrigerant systems. Rack valves
are disposed in the refrigerant rack lines for controlling the flow
of refrigerant through the rack lines to a selected refrigerant
system. A system controller is connected to the electronic scale
for receiving the weight signals from the weight scale. The
controller controls the rack valves and tank valve to selectively
connect the supply of refrigerant in the refrigerating tank with a
selected refrigerant system so that the amount of refrigerant
delivered to the refrigerant system is recorded by the system
controller. An input device is provided for inputting data into the
controller. A display is in communication with the controller for
displaying the charging process and the current quantity of
refrigerant in the tank. The housing includes a door moveable
between an open position and a closed position; and includes a door
sensor for determining whether the door is closed to generate a
door closed signal.
[0010] The controller includes a computer readable medium, and a
computer program residing in the computer readable medium having
operating instructions for operating the system during the
refrigerant charging process. The operating instructions include
instructions for preventing the operation of the system unless a
door closed signal is received by the controller. The operating
instructions include (1) instructions for recording the amount of
refrigerant indicated by the weight signal along with the time and
date of the delivery of refrigerant to the refrigerant system; (2)
instructions for receiving a selection signal indicating which rack
line to supply refrigerant through instructions for opening a rack
valve corresponding to the rack line desired to be charged with
refrigerant; (3) instructions for opening the tank valve; (4)
instructions for receiving the weight signal of the refrigerant
being supplied through the rack line; and (5) instructions for
closing the tank valve and the selected rack valve in response to
receiving a stop signal, and recording the final weight signal at
the time the stop signal is received. The computer program further
includes instructions for storing and displaying an initial weight
signal prior to opening the rack valve and the tank valve, for
storing and displaying the final weight, and for processing the
initial and final weight signals to determine the amount of
refrigerant delivered to the refrigerant system. A transaction file
is created after the process containing the amount of refrigerant
delivered to the refrigerant system, and the time and date of the
delivery, which is stored on a system server.
DESCRIPTION OF THE DRAWINGS
[0011] The construction designed to carry out the invention will
hereinafter be described, together with other features thereof.
[0012] The invention will be more readily understood from a reading
of the following specification and by reference to the accompanying
drawings forming a part thereof, wherein an example of the
invention is shown and wherein:
[0013] FIG. 1 illustrates a front elevation of a housing for a
refrigerant measuring and accounting system according to the
invention;
[0014] FIG. 2 is a schematic of the front view of the system with
the door removed;
[0015] FIG. 3 is a schematic of the isometric view of the system
with the door of the housing in an open position;
[0016] FIG. 4 is a block diagram of a refrigerant monitoring system
according to the invention;
[0017] FIG. 5 is a flow chart of the operation of the refrigerant
monitoring system according to the invention; and
[0018] FIG. 6 is a schematic illustration of a transaction file
according to the invention.
DESCRIPTION OF A PREFERRED EMBODIMENT
[0019] Referring now to the drawings, the invention will now be
described in more detail. FIG. 1, illustrates a cabinet housing 10
for a computerized refrigerant measuring and accounting system,
designated generally as A, according to the invention. The cabinet
housing includes a door 12, with handles 12a, on measurement
compartment 14, and a control panel 16 having a display 18.
[0020] As can best be seen in FIG. 2, with door 12 removed,
measurement compartment 14 includes a weight scale 20. a
refrigerant container 21, is supported on the scale. There are a
plurality of refrigerant lines 23a, 23b, 23c, and 23d connected to
a plurality of refrigerant systems 25a, 25b, 25c, and 25d,
respectively. Display 18 provides the user information regarding
the activity of the system, and prompts the user to make inputs on
keypad 22. The display shows the charging process and the current
weight on the scale. Keypad 22 is the illustrated manner in which
the user of the system communicates with the system. Indicators 24
show the user which system, 25a-25d, is being charged and if the
system is operating. Refrigerant monitoring system (RMS) controller
26 receives input from keypad 22 and controls rack valves 28a, 28b,
28c, and 28d and tank valve 30 accordingly. System controller 26
handles the communication, operation, and logical control of the
system. For this purpose, a program containing a set of computer
readable instructions 29 is stored in a computer readable medium 27
of controller 26 (FIG. 4). The controller further includes an SI
card 26a which powers and calibrates the reading of scale 20. The
card is wired to the controller to send a 0-10vdc signal to the
controller based on the weight on the scale. Depending on user
input on keypad 22, RMS controller 26 opens rack valve 28a, 28b,
28c, or 28d, and tank valve 30, or closes rack valves 28a-28d and
tank valve 30. If the user wishes to put refrigerant into
refrigerant system 25a that is connected to rack valve 28a, then
the user would input this request on keypad 22. Keypad 22 also
inputs a ticket number. Controller 26 receives this input and
transmits information to rack valve 28a causing it to open. Then,
controller 26 would cause tank valve 30 to open. This would allow
refrigerant to flow from the refrigerant tank through tank valve 30
through rack valve 28a while maintaining the other valves closed.
During the process of delivering refrigerant to the systems, the
refrigerant tank 21 is supported on scale 20.
[0021] FIG. 3 is an isometric view of the system A shown in FIG. 2.
FIG. 3 shows display 8, keypad 22 and scale 20 as in FIG. 2, and
holes 34a, 34b, 34c, and 34d for rack plumbing 23a-23d. The
plumbing connected to refrigerant tank exits through these holes
and routed to its respective refrigerant system 25a-25d. For
example, the plumbing exiting hole 34a goes to rack 23a to provide
refrigerant to refrigerant system 25a. Also shown on FIG. 3 is the
entrance and exit for power and network connections 36. Through
exit hole 36 the power cord which gives power to the controller 26
and any network cable connecting controller 26 to an outside
network 38 having a remote computer terminal 38a, keyboard or other
input device 38b, and/or mouse device 38c can be fed through the
cabinet.
[0022] Referring now to FIG. 4, a more detailed drawing is
presented showing the interaction between controller 26, keypad 22,
tank valve 30, rack valves 28a-28d, and network hub 49. As can be
seen, when a user of the system wishes to begin transferring
refrigerant into a system, his input on keypad 22 goes directly to
controller 26. Controller 26 controls tank valve 30 and one or more
rack valves 28a-28d. Controller 26 upon proper input from keypad 22
first opens tank valve 30 which allows refrigerant to pass into one
or more refrigerant systems 25a-25d. Then, according to user's
input at keypad 22 one or more of the rack valves 28a-28d is
opened. This causes refrigerant flowing through tank valve 30 to
flow to the appropriate rack valve, for example rack valve 28b.
[0023] Referring now to FIG. 4a, an alternative embodiment of the
invention is shown. This embodiment does not use a rack of valves
for allowing multiple systems to receive refrigerant from one tank.
Rather this system has the same components of a controller, scale,
display, keypad, network capabilities, and one valve only. In this
embodiment the refrigerant delivery and monitoring system would be
a portable system that could be taken from location to location to
charge multiple refrigerant systems. Note that in this and all
other embodiments the term refrigerant systems should not be
construed narrowly to only include refrigerant systems. Rather this
term should be construed to define all systems using refrigerant
including but not limited to refrigerant systems including HVAC
systems. This alternative embodiment can be used to charge
different refrigerant systems in different locations, or
alternatively it can be located for just one refrigerant system in
the case of a smaller company. Smaller companies may only need to
have their refrigerant charged in one line or one system, and this
embodiment of the invention would be preferable in this situation
as a more cost effective and size efficient system.
[0024] The detailed description that follows may be presented in
terms of program procedures executed on a computer or network of
computers. These procedural descriptions are representations used
by those skilled in the art to most effectively convey the
substance of their work to others skilled in the art. These
procedures herein described are generally a self-consistent
sequence of steps leading to a desired result. These steps require
physical manipulations of physical quantities such as electrical or
magnetic signals capable of being stored, transferred, combined,
compared, or otherwise manipulated by a set of computer readable
instructions embodied in a computer readable medium that is
designed to perform a specific task or tasks. Actual computer or
executable code or computer readable code may be contained within
one file or one storage medium but may also span several computers
or storage mediums. The term "host" and "server" may be hardware,
software, or a combination of hardware and software that provides
the functionality described herein.
[0025] The present invention is described below with reference to
flowchart illustrations of methods, apparatus ("systems") and
computer program products according to the invention. It will be
understood that each block, or step of a flowchart illustration can
be implemented by a set of computer readable instructions or code.
These computer readable instructions may be loaded onto a general
purpose computer, special purpose computer, or other programmable
data processing apparatus to produce a machine such that the
instructions will execute on a computer or other data processing
apparatus to create a means for implementing the functions
specified in the flowchart block or blocks.
[0026] These computer readable instructions may also be stored in a
computer readable medium that can direct a computer or other
programmable data processing apparatus to function in a particular
manner, such that the instructions stored in a computer readable
medium produce an article of manufacture including instruction
means that implement the functions specified in the flowchart block
or blocks. Computer program instructions may also be loaded onto a
computer or other programmable apparatus to produce a computer
executed process such that the instructions are executed on the
computer or other programmable apparatus provide steps for
implementing the functions specified in the flowchart block or
blocks. Accordingly, elements of the flowchart support combinations
of means for performing the special functions, combination of steps
for performing the specified functions and program instruction
means for performing the specified functions. It will be understood
that each block of the flowchart illustrations can be implemented
by special purpose hardware based computer systems that perform the
specified functions, or steps, or combinations of special purpose
hardware or computer instructions. The term media is used to
include audio, video, animation or any other form audio or visual
information. The present invention is now described more fully
herein with reference to the drawings in which the preferred
embodiment of the invention is shown. This invention may, however,
be embodied any many different forms and should not be construed as
limited to the embodiment set forth herein. Rather, these
embodiments are provided so that this disclosure will be thorough
and complete and will fully convey the scope of the invention to
those skilled in the art.
[0027] Referring now to FIG. 5, a flow chart of the system and
method is shown. At step 50, the technician enters a ticket number.
At step 51, a refrigerant tank is placed on scale 20 in the
cabinet. For the system to work the refrigerant tank must be placed
on the scale inside the cabinet. At step 52, the system makes a
determination if the door of the cabinet is closed. If the door is
not closed at step 52 then the system continues to loop until the
door is closed. For this purpose, a door closed sensor 42 is
provided and is connected to controller 26. If the door is closed,
the technician presses the start button at step 54. At step 56, the
technician selects a rack line to charge. The technician chooses
between lines 23a-23d in this embodiment. In alternative
embodiments, there could be 1, 2, or any number of racks the
technician could choose from. At step 58, the system stores and
displays the weight of the refrigerant in container 21 and stores
the current date and time. These functions are achieved through RMS
controller 26. At step 60, controller 26 energizes the selected
rack relay valve 28a-28d. This would correspond to the selection
made by the technician. For example, if the user had selected line
23a, then valve 28a would be energized. The rack valves are
solenoid valves, thus when they receive energy they open or close
depending on their current state. At step 62, the tank valve is
energized. As in the rack valve, the energizing causes this valve
to open if it was previously closed. At step 64, the system
measures the weight of the refrigerant tank every second. The
system continues to do this unless at step 66 the stop button is
pressed. If the stop button is not pressed at 66, the system loops
back to step 64 where it continues to take the weight of the
refrigerant tank every second. If the stop button is pressed at
step 66, then tank relay valve 30 is de-energized at step 68. This
causes the valve to close. Then at step 70, a pump down timer runs.
The purpose of the pump down timer is to allow any refrigerant that
had entered through tank valve 30 but not gone through rack valve
28a for example, to pump into the system thus not clogging the
line. At step 72, the current refrigerant tank weight is stored.
Once step 72 is complete, then at step 74 the selected valve is
de-energized, thus closing that rack valve. Note that in
alternative embodiments the refrigerant weights can be measured
before the pump down timer runs. The system then goes to step 78
where a transaction file is generated and sent to the server 38a
via network connection 38. At step 80, the unit is ready for more
transfer of refrigerant.
[0028] Each time refrigerant is added to a refrigerant system
25a-25d, the amount of refrigerant, and other related data, is
stored in database 44 in communication and readable by computer
server 38a. Server 38a may be provided with a keyboard 38b and
mouse input 38c. An example of a refrigerant system transaction
file 82 is shown in FIG. 6. As is shown, it includes the store
name, the date and time of the operation, the identity of the
system charged, the amount of refrigerant used in the charge, and
the ticket number. The data may be stored "for any periodic" or
other reporting basis and may be stored for the life to the
refrigerant system. Reports may be displayed or printed at server
38a. Placing the information into a database allows the user of the
system easy access to the history of the refrigerant system for
providing accounting reports to regulatory agencies and others.
[0029] The RMS system can communicate directly onto the internet
and provide web pages for access and viewing the systems operation.
In most cases, the RMS unit will plug into the stores Local Area
Network (LAN) via the stores network HUB and communicate to a
database server on the customer's Wide Area Network (WAN). When
installed on the customer's network, the RMS Controller can use an
IP address and a POSTING IP address or URL for the database server.
The database server will then use the RMS information for
reporting, alarming, bill verification, etc.
[0030] Note that an alternative embodiments the RMS system can have
local storage of all data rather than transmitting the data over a
network connection. As described above, there are situations where
only one rack must be charged with refrigerant, in these situations
it may be preferable for a smaller entity to maintain their
information locally on the RMS system or on an associated computer.
Also, the RMS device may use a database server as described above
or it may simply e-mail the data collected during charging to a
desired e-mail address. Upon receiving the e-mail containing the
data, the recipient may parse the data into a readable format and
have available verifiable reports of all charges made and all
refrigerant used.
[0031] While a preferred embodiment of the invention has been
described using specific terms, such description is for
illustrative purposes only, and it is to be understood that changes
and variations may be made without departing from the spirit or
scope of the following claims.
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