CA2897081C - Transcritical r744 refrigeration system with gas cooler outlet vapors used as a heat source for the dehumidifying coil - Google Patents
Transcritical r744 refrigeration system with gas cooler outlet vapors used as a heat source for the dehumidifying coil Download PDFInfo
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- CA2897081C CA2897081C CA2897081A CA2897081A CA2897081C CA 2897081 C CA2897081 C CA 2897081C CA 2897081 A CA2897081 A CA 2897081A CA 2897081 A CA2897081 A CA 2897081A CA 2897081 C CA2897081 C CA 2897081C
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- heat
- gas cooler
- dehumidifying
- transcritical
- heat exchanger
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
- F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
Abstract
A transcritical R-744 refrigeration systems for supermarkets with dehumidifying capability where the heat of the R-744 leaving the gas cooler is used for dehumidifying. The same heat exchanger is used for heat reclaim and dehumidifying purposes.
Description
Jul 15 02:45p Equinox IP F.B. 14504823478 10.3 COOLER OUTLET VAPORS USED AS A HEAT SOURCE FOR THE
DEHUMIDIFYING COIL
FIELD OF THE INVENTION
5 [0001] The present invention relates to transcritical R-744 refrigeration systems, and more specifically to transcritical R-744 refrigeration systems for supermarkets and the like, which use multiple compressors and multiple evaporators to refrigerate and/or to maintain in frozen conditions perishable food products. The refrigeration system used is transcritical R744 system 10 having heat reclaim and dehumidifying capability.
BACKGROUND OF THE INVENTION
DEHUMIDIFYING COIL
FIELD OF THE INVENTION
5 [0001] The present invention relates to transcritical R-744 refrigeration systems, and more specifically to transcritical R-744 refrigeration systems for supermarkets and the like, which use multiple compressors and multiple evaporators to refrigerate and/or to maintain in frozen conditions perishable food products. The refrigeration system used is transcritical R744 system 10 having heat reclaim and dehumidifying capability.
BACKGROUND OF THE INVENTION
[0002] During some periods of the year when the ambient temperatures and humidity are elevated, it is necessary to provide, in addition to the air conditioning, a system which will reduce the relative air humidity in the supermarket. Failing to do so will result in high air relative humidity inside the store, frequent defrosts, frosting of the surface of the food products and discomfort for the customers.
[0003] The most frequently used dehumidifying method in supermarkets is to install heating coil downstream of the air conditioning coil. The air from the outlet of the air conditioning coil has low temperature and very high relative humidity. By reheating this air to a comfortable temperature level the relative humidity is lowered to acceptable level (around 40%). Most often the heat of the high pressure compressed refrigerant that vapors directly from the discharge outlet of the compressors is used as a heat source for the heating coil. This method provides sufficient heat for the dehumidification process but in the case of R744 transcritical system, having into consideration that the dehumidification process is used mainly during the summer period, does not provide increase of efficiency of the transcritical refrigeration system which PAGE 3113* RCVD AT 7/10/2015 2:58:32 PM [Eastern Daylight TImel* SVR:F00003116 DNIS:3905* CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:46p, Equinox IP F.B. 14504823478 p.4 during the summer period is significantly lower than that of the freon refrigeration systems.
[0004] The need to improve the cycle efficiency during the warmer periods of the year is obvious.
5 [0005] Accordingly, there is a need for an improved transcritical R-744 refrigeration system.
SUMMARY OF THE INVENTION
SUMMARY OF THE INVENTION
[0006] It is therefore a general object of the present invention to provide an improved transcritical R-744 refrigeration system and method.
10 [00071 An advantage of the present invention is that the transcritical R-refrigeration system and method, instead of using the high pressure compressed refrigeration vapors directly from the discharge outlet of the compressors as a heat source for the heating coil, uses the vapors from the outlet of the gas cooler are as a heat source for the heating coil.
[0008] Another advantage of the present invention is that the transcritical R-refrigeration system and method.uses only one heat exchanger for heat reclaim and dehumidifying purposes.
[0009] A further advantage of the present invention is that the transcritical R-744 refrigeration system and method, by using the vapors from the outlet of the gas cooler as a heat source for dehumidification, a significant amount of subcooling capacity is provided thus increasing the efficiency of the system without installing additional equipment and without adding to the power consumption of the system.
[0010] Still another advantage of the present invention is that the transcritical R-744 refrigeration system and method, by feeding vapors with lower temperature through the dehumidifying heat exchanger, reduces the thermal stress to the heat exchanger thus increasing the reliability and the useful Fife of the dehumidifying system.
PAGE 4113* RCVD AT 7/10/2015 2:58:32 PM [Eastern Daylight Timel*
SVR:F00003116*DNIS:3905 CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:46p Equinox IP F.B. 14504823478 10.5 [0011] According to an aspect of the present invention, there is provided a transcritical R-744 refrigeration system for supermarket with dehumidifying capability, the transcritical R-744 refrigeration system having a vapor of a R-refrigerant circulating from a compressor to a heat reclaim /dehumidifying heat 5 exchanger, a gas cooler, a receiver and an evaporator, and back to the compressor via a plurality of conduits and a plurality of valves, the transcntical R-744 refrigeration system comprising a modulating valve allowing heat of at least a portion of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before 10 circulating to the receiver.
[0012] In one embodiment, one of the plurality of conduits is a conduit junction located between the gas cooler and the receiver, one of the plurality of valves is a second valve located between the conduit junction and the receiver, and the modulating valve is located between the conduit junction and the heat reclaim /dehumidifying heat exchanger, wherein the modulating valve allowing heat of all of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver when the modulating valve is open and the second valve is closed.
[0013] According to another aspect of the present invention, there is provided a method of dehumidifying a heat reclaim /dehumidifying heat exchanger of a transcritical R-744 refrigeration system, the transcritical R-744 refrigeration system having a vapor of a R-744 refrigerant circulating from a compressor to a heat reclaim /dehumidifying heat exchanger, a gas cooler, a receiver and an evaporator, and back to the compressor via a plurality of conduits and a plurality of valves, the method comprising the step of: modulating a modulating valve to allow heat of at least a portion of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
100141 In one embodiment, one of the plurality of conduits is a conduit junction located between the gas cooler and the receiver, one of the plurality of valves is a second valve located between the conduit junction and the receiver, the modulating valve is located between the conduit junction and the heat reclaim PAGE 5113* RCVD AT 7/1012015 2:58:32 PM [Eastern Daylight Time] SVR:F00003/16*
DNIS:3905* CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:46p Equinox IP F.B. 14504823478 p.6 /dehumidifying heat exchanger, wherein the method further comprising the step of: dosing the second valve as to allow all of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
5 [0015] Other objects and advantages of the present invention will become apparent from a careful reading of the detailed description provided herein, with appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Further aspects and advantages of the present invention will become 10 better understood with reference to the description in association with the following Figure, wherein:
[0017] Figure 1 is a schematic view of a transcritical R-744 refrigeration system having the gas cooler outlet vapors used as a heat source for the dehumidifying the heating coil in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0018] With reference to the annexed drawings the preferred embodiment of the present invention will be herein described for indicative purpose and by no means as of limitation.
[0019] Referring to Figure 1, there is schematically shown a transcritical R-refrigeration system 30 having the gas cooler outlet vapors used as a heat source for the dehumidifying the heating coil in accordance with an embodiment of the present invention.
[0020] The refrigeration system shown on Figure 1 is a simplified schematic of the transcritical R-744 system 30 with the low temperature compressors and all evaporators not being specifically shown since they are not participating directly into the dehumidifying and heat reclaim process.
PAGE 6113* RCVD AT 711012015 2:58:32 PM [Eastern Daylight Timel*
SVR:F00003116*DNIS:3905* CSID:14504823478 * DURATION (mm-ss):04-54 Jul 15 02:47p Equinox IP F.B. 14504823478 ID.7 [0021] If heat reclaim or dehumidifying are not required, the compressed refrigerant vapors from corn pressors 11 are fed through conduit 12 and conduit 18 to the gas cooler 5, and then through conduit 19 and conduit 20 to the throttling device 9 and then to the receiver (flash tank) 10. During this 5 operational configuration, valves 25 and 7 are fully open, while valves 3, 4, 6 and 8 are completely closed. Valve 7, the 'second valve', is located between the gas cooler 5 and the receiver 10, downstream of a conduit junction 26 allowing the refrigerant vapors leaving the gas cooler 5 to circulate to a heat reclaim /dehumidifying heat exchanger 1 for the dehumidification thereof, as 10 further explained herein below.
[0022] If heat reclaim is required, valve 25 is adjusted to maintain a pressure higher than the pressure maintained by valve 3. Valve 4 is completely open.
The compressed vapors from compressors 11 are fed through conduit 12, valve 4 and conduit 13 to the heat reclaim /dehumidifying heat exchanger 1 where the 15 heat of the vapors is transferred to the air flowing through the heat exchanger.
The valve 3 maintains the necessary pressure in order to provide maximum efficiency. From heat exchanger 1, the vapors are fed through valve 3, conduit 14, conduit 16, conduit 17 and conduit 18 to the gas cooler 5. Valve 6 and 8 are completely closed and valve 7 is completely open. From the gas cooler 5, the 20 vapors and/or liquid refrigerant, depending on the operation conditions, are fed through conduit 19 and conduit 20 to the throttling device 9 and from there to the receiver 10.
[0023] If dehumidifying is required, valve 25 is completely open, valves 3, 4 and
10 [00071 An advantage of the present invention is that the transcritical R-refrigeration system and method, instead of using the high pressure compressed refrigeration vapors directly from the discharge outlet of the compressors as a heat source for the heating coil, uses the vapors from the outlet of the gas cooler are as a heat source for the heating coil.
[0008] Another advantage of the present invention is that the transcritical R-refrigeration system and method.uses only one heat exchanger for heat reclaim and dehumidifying purposes.
[0009] A further advantage of the present invention is that the transcritical R-744 refrigeration system and method, by using the vapors from the outlet of the gas cooler as a heat source for dehumidification, a significant amount of subcooling capacity is provided thus increasing the efficiency of the system without installing additional equipment and without adding to the power consumption of the system.
[0010] Still another advantage of the present invention is that the transcritical R-744 refrigeration system and method, by feeding vapors with lower temperature through the dehumidifying heat exchanger, reduces the thermal stress to the heat exchanger thus increasing the reliability and the useful Fife of the dehumidifying system.
PAGE 4113* RCVD AT 7/10/2015 2:58:32 PM [Eastern Daylight Timel*
SVR:F00003116*DNIS:3905 CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:46p Equinox IP F.B. 14504823478 10.5 [0011] According to an aspect of the present invention, there is provided a transcritical R-744 refrigeration system for supermarket with dehumidifying capability, the transcritical R-744 refrigeration system having a vapor of a R-refrigerant circulating from a compressor to a heat reclaim /dehumidifying heat 5 exchanger, a gas cooler, a receiver and an evaporator, and back to the compressor via a plurality of conduits and a plurality of valves, the transcntical R-744 refrigeration system comprising a modulating valve allowing heat of at least a portion of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before 10 circulating to the receiver.
[0012] In one embodiment, one of the plurality of conduits is a conduit junction located between the gas cooler and the receiver, one of the plurality of valves is a second valve located between the conduit junction and the receiver, and the modulating valve is located between the conduit junction and the heat reclaim /dehumidifying heat exchanger, wherein the modulating valve allowing heat of all of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver when the modulating valve is open and the second valve is closed.
[0013] According to another aspect of the present invention, there is provided a method of dehumidifying a heat reclaim /dehumidifying heat exchanger of a transcritical R-744 refrigeration system, the transcritical R-744 refrigeration system having a vapor of a R-744 refrigerant circulating from a compressor to a heat reclaim /dehumidifying heat exchanger, a gas cooler, a receiver and an evaporator, and back to the compressor via a plurality of conduits and a plurality of valves, the method comprising the step of: modulating a modulating valve to allow heat of at least a portion of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
100141 In one embodiment, one of the plurality of conduits is a conduit junction located between the gas cooler and the receiver, one of the plurality of valves is a second valve located between the conduit junction and the receiver, the modulating valve is located between the conduit junction and the heat reclaim PAGE 5113* RCVD AT 7/1012015 2:58:32 PM [Eastern Daylight Time] SVR:F00003/16*
DNIS:3905* CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:46p Equinox IP F.B. 14504823478 p.6 /dehumidifying heat exchanger, wherein the method further comprising the step of: dosing the second valve as to allow all of the R-744 refrigerant leaving the gas cooler to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
5 [0015] Other objects and advantages of the present invention will become apparent from a careful reading of the detailed description provided herein, with appropriate reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Further aspects and advantages of the present invention will become 10 better understood with reference to the description in association with the following Figure, wherein:
[0017] Figure 1 is a schematic view of a transcritical R-744 refrigeration system having the gas cooler outlet vapors used as a heat source for the dehumidifying the heating coil in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0018] With reference to the annexed drawings the preferred embodiment of the present invention will be herein described for indicative purpose and by no means as of limitation.
[0019] Referring to Figure 1, there is schematically shown a transcritical R-refrigeration system 30 having the gas cooler outlet vapors used as a heat source for the dehumidifying the heating coil in accordance with an embodiment of the present invention.
[0020] The refrigeration system shown on Figure 1 is a simplified schematic of the transcritical R-744 system 30 with the low temperature compressors and all evaporators not being specifically shown since they are not participating directly into the dehumidifying and heat reclaim process.
PAGE 6113* RCVD AT 711012015 2:58:32 PM [Eastern Daylight Timel*
SVR:F00003116*DNIS:3905* CSID:14504823478 * DURATION (mm-ss):04-54 Jul 15 02:47p Equinox IP F.B. 14504823478 ID.7 [0021] If heat reclaim or dehumidifying are not required, the compressed refrigerant vapors from corn pressors 11 are fed through conduit 12 and conduit 18 to the gas cooler 5, and then through conduit 19 and conduit 20 to the throttling device 9 and then to the receiver (flash tank) 10. During this 5 operational configuration, valves 25 and 7 are fully open, while valves 3, 4, 6 and 8 are completely closed. Valve 7, the 'second valve', is located between the gas cooler 5 and the receiver 10, downstream of a conduit junction 26 allowing the refrigerant vapors leaving the gas cooler 5 to circulate to a heat reclaim /dehumidifying heat exchanger 1 for the dehumidification thereof, as 10 further explained herein below.
[0022] If heat reclaim is required, valve 25 is adjusted to maintain a pressure higher than the pressure maintained by valve 3. Valve 4 is completely open.
The compressed vapors from compressors 11 are fed through conduit 12, valve 4 and conduit 13 to the heat reclaim /dehumidifying heat exchanger 1 where the 15 heat of the vapors is transferred to the air flowing through the heat exchanger.
The valve 3 maintains the necessary pressure in order to provide maximum efficiency. From heat exchanger 1, the vapors are fed through valve 3, conduit 14, conduit 16, conduit 17 and conduit 18 to the gas cooler 5. Valve 6 and 8 are completely closed and valve 7 is completely open. From the gas cooler 5, the 20 vapors and/or liquid refrigerant, depending on the operation conditions, are fed through conduit 19 and conduit 20 to the throttling device 9 and from there to the receiver 10.
[0023] If dehumidifying is required, valve 25 is completely open, valves 3, 4 and
7 are completely closed and valves 6 and 8 are completely open. The 25 compressed refrigeration vapors from compressors are fed through conduit 12, valve 25 and conduit 18 to the gas cooler 5. The vapors from the outlet of the gas cooler 5 are fed through conduit 19, junction 26, valve 6, conduit 22, conduit 23, conduit 24 and conduit 13 to the heat reclaim /dehumidifying heat exchanger 1. Cooled by the air-conditioning heat exchanger 2, air is reheated 30 by the dehumidifying heat exchanger 1, using the heat of the vapors from the gas cooler 5 outlet, thus reducing its relative humidity. From heat exchanger 1, _ PAGE 7113* RCVD AT 7/10/2015 2:58:32 PM [Eastern Daylight Time]
SVR:F00003/16 DNIS:3905* CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:47p Equinox IP F.B. 14504823478 p.8 the refrigerant is fed through conduit 14, conduit 15, conduit 21 and valve 8 to conduit 20 and then to throttling device 9 and receiver 10.
[0024] An embodiment of the present invention is a method of dehumidifying a heat reclaim /dehumidifying heat exchanger 1 of a transcritical R-744 refrigeration system 30. The method includes the step of modulating the modulating valve 6 to allow heat of at least a portion of the R-744 refrigerant leaving the gas cooler 5 to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger 1 before circulating to the receiver 10.
[0025] Preferably, the method includes the step of closing the second valve 7 10 as to allow all of the R-744 refrigerant leaving the gas cooler 5 to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger 1 before circulating to the receiver 10.
[0026] Although the present invention has been described with a certain degree of particularity, it is to be understood that the disclosure has been made by way of example only and that the present invention is not limited to the features of the embodiments described and illustrated herein, but includes all variations and modifications within the scope of the invention as hereinabove described and hereinafter claimed.
PAGE 8113* RCVD AT 7110/2015 2:58:32 PM [Eastern Dayllaht Timel* SVR:F00003116 * DNIS:3905 CSID:14504823478 DURATION (mm-ss):04-54
SVR:F00003/16 DNIS:3905* CSID:14504823478* DURATION (mm-ss):04-54 Jul 15 02:47p Equinox IP F.B. 14504823478 p.8 the refrigerant is fed through conduit 14, conduit 15, conduit 21 and valve 8 to conduit 20 and then to throttling device 9 and receiver 10.
[0024] An embodiment of the present invention is a method of dehumidifying a heat reclaim /dehumidifying heat exchanger 1 of a transcritical R-744 refrigeration system 30. The method includes the step of modulating the modulating valve 6 to allow heat of at least a portion of the R-744 refrigerant leaving the gas cooler 5 to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger 1 before circulating to the receiver 10.
[0025] Preferably, the method includes the step of closing the second valve 7 10 as to allow all of the R-744 refrigerant leaving the gas cooler 5 to directly reach and dehumidify the heat reclaim /dehumidifying heat exchanger 1 before circulating to the receiver 10.
[0026] Although the present invention has been described with a certain degree of particularity, it is to be understood that the disclosure has been made by way of example only and that the present invention is not limited to the features of the embodiments described and illustrated herein, but includes all variations and modifications within the scope of the invention as hereinabove described and hereinafter claimed.
PAGE 8113* RCVD AT 7110/2015 2:58:32 PM [Eastern Dayllaht Timel* SVR:F00003116 * DNIS:3905 CSID:14504823478 DURATION (mm-ss):04-54
Claims (4)
1. A transcritical R-744 refrigeration system for a supermarket with dehumidifying capability, the transcritical R-744 refrigeration system comprising a gas cooler, a plurality of transcritical compressors, a heat reclaim /dehumidifying heat exchanger, a flash tank receiver and a modulating valve allowing heat of at least a portion of a gaseous R-744 refrigerant leaving the gas cooler to heat and dehumidify air passing through the heat reclaim /dehumidifying heat exchanger, wherein during dehumidification of the passing air, the gaseous R-744 refrigerant from a discharge of said plurality of transcritical compressors being fed to said gas cooler and then fed from an outlet of said gas cooler to an inlet of said heat reclaim /dehumidifying heat exchanger before being fed to said flash tank receiver, and further wherein during heat reclaim, at least a portion of the gaseous R-744 refrigerant from the discharge of said plurality of transcritical compressors being fed to the inlet of said heat reclaim /dehumidifying heat exchanger before being fed to said gas cooler and then to said flash tank receiver.
2. The system of claim 1, further comprising a conduit junction located between the gas cooler and the receiver and a second valve located between the conduit junction and the receiver, and wherein the modulating valve is located between the conduit junction and the inlet of the heat reclaim /dehumidifying heat exchanger, the modulating valve allowing the remaining heat of all of the gaseous R-744 refrigerant leaving the gas cooler to reach and dehumidify the air passing through the heat reclaim /dehumidifying heat exchanger before circulating to the receiver when the modulating valve is open and the second valve is closed.
Date Recue/Date Received 2022-02-04
Date Recue/Date Received 2022-02-04
3. A method of dehumidifying an air flow used for air conditioning or heating a supermarket having a transcritical R-744 refrigeration system, the method comprising the step of:
- controlling a modulating valve to allow heat of at least a portion of a gaseous R-744 refrigerant leaving a gas cooler to heat and dehumidify air passing through a heat reclaim /dehumidifying heat exchanger, wherein during dehumidification of the passing air, the gaseous R-744 refrigerant from a discharge of a plurality of transcritical compressors being fed to said gas cooler and then fed from an outlet of said gas cooler to an inlet of said heat reclaim /dehumidifying heat exchanger before being fed to a flash tank receiver, and further wherein during heat reclaim, at least a portion of the gaseous R-744 refrigerant from the discharge of said plurality of transcritical compressors being fed to the inlet of said heat reclaim /dehumidifying heat exchanger before being fed to said gas cooler and then to said flash tank receiver.
- controlling a modulating valve to allow heat of at least a portion of a gaseous R-744 refrigerant leaving a gas cooler to heat and dehumidify air passing through a heat reclaim /dehumidifying heat exchanger, wherein during dehumidification of the passing air, the gaseous R-744 refrigerant from a discharge of a plurality of transcritical compressors being fed to said gas cooler and then fed from an outlet of said gas cooler to an inlet of said heat reclaim /dehumidifying heat exchanger before being fed to a flash tank receiver, and further wherein during heat reclaim, at least a portion of the gaseous R-744 refrigerant from the discharge of said plurality of transcritical compressors being fed to the inlet of said heat reclaim /dehumidifying heat exchanger before being fed to said gas cooler and then to said flash tank receiver.
4. The method of claim 3, wherein the step of controlling further comprising:
- opening the modulating valve, located between a conduit junction being located between the gas cooler and the receiver and the inlet of the heat reclaim /dehumidifying heat exchanger, and closing a second valve located between the conduit junction and the receiver to allow the heat of all of the gaseous R-744 refrigerant leaving the gas cooler to reach and dehumidify the air passing through the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
- opening the modulating valve, located between a conduit junction being located between the gas cooler and the receiver and the inlet of the heat reclaim /dehumidifying heat exchanger, and closing a second valve located between the conduit junction and the receiver to allow the heat of all of the gaseous R-744 refrigerant leaving the gas cooler to reach and dehumidify the air passing through the heat reclaim /dehumidifying heat exchanger before circulating to the receiver.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201462022887P | 2014-07-10 | 2014-07-10 | |
| US62/022,887 | 2014-07-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2897081A1 CA2897081A1 (en) | 2016-01-10 |
| CA2897081C true CA2897081C (en) | 2023-02-28 |
Family
ID=55067318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2897081A Active CA2897081C (en) | 2014-07-10 | 2015-07-10 | Transcritical r744 refrigeration system with gas cooler outlet vapors used as a heat source for the dehumidifying coil |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20160010904A1 (en) |
| CA (1) | CA2897081C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030764A (en) * | 2018-01-11 | 2019-07-19 | 开利公司 | Refrigeration system and its control method |
| US11226144B2 (en) * | 2018-05-18 | 2022-01-18 | Systemes Lmp Inc. | R-744 system with hot gas defrost by the transcritical compressors |
| US11137171B2 (en) * | 2018-12-11 | 2021-10-05 | Systemes Lmp Inc. | Transcritical R-744 refrigeration system for supermarkets with improved efficiency and reliability |
| US11867437B2 (en) | 2021-04-29 | 2024-01-09 | Flo Energy Solutions Inc. | HVAC dual de-superheating/subcooling heat reclaim system for transcritical refrigeration systems |
| CN115076994A (en) * | 2022-06-13 | 2022-09-20 | 安徽正刚新能源科技有限公司 | Waste heat recycling system of rotary dehumidification unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4285205A (en) * | 1979-12-20 | 1981-08-25 | Martin Leonard I | Refrigerant sub-cooling |
| US4621505A (en) * | 1985-08-01 | 1986-11-11 | Hussmann Corporation | Flow-through surge receiver |
| US4711094A (en) * | 1986-11-12 | 1987-12-08 | Hussmann Corporation | Reverse cycle heat reclaim coil and subcooling method |
| US20060130494A1 (en) * | 2004-12-20 | 2006-06-22 | Serge Dube | Defrost refrigeration system |
| DE102006024796B4 (en) * | 2006-03-17 | 2009-11-26 | Konvekta Ag | air conditioning |
| CA2779757A1 (en) * | 2011-06-10 | 2012-12-10 | Systemes Lmp Inc. | Suction compressor temperature regulator device for transcritical and subcritical r-744 compressors |
-
2015
- 2015-07-10 CA CA2897081A patent/CA2897081C/en active Active
- 2015-07-10 US US14/796,340 patent/US20160010904A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CA2897081A1 (en) | 2016-01-10 |
| US20160010904A1 (en) | 2016-01-14 |
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