US20190316828A1 - Transportation refrigeration system having multiple fans - Google Patents
Transportation refrigeration system having multiple fans Download PDFInfo
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- US20190316828A1 US20190316828A1 US16/290,261 US201916290261A US2019316828A1 US 20190316828 A1 US20190316828 A1 US 20190316828A1 US 201916290261 A US201916290261 A US 201916290261A US 2019316828 A1 US2019316828 A1 US 2019316828A1
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- Prior art keywords
- heat exchanger
- compartment
- variable speed
- refrigeration system
- speed fan
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/323—Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3232—Cooling devices using compression particularly adapted for load transporting vehicles
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/003—Transport containers
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
-
- 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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- This application relates to refrigeration systems having at least two fans for cooling an enclosed cargo space.
- Refrigeration systems are known. Generally, a compressor compresses a refrigerant and delivers it into a condenser. The refrigerant is cooled and passes through an expansion valve. The refrigerant is expanded and passes through an evaporator. The evaporator cools air to be delivered into an environment to be conditioned.
- a truck may have a refrigerated trailer. It is known to provide distinct temperatures at distinct compartments within a common trailer. Individual refrigeration circuits are often utilized to provide the distinct temperatures.
- a transportation refrigeration system includes a refrigeration circuit that includes a compressor, a condenser, a first heat exchanger and a second heat exchanger.
- a first variable speed fan is associated with the first heat exchanger and a second variable speed fan is associated the second heat exchanger.
- the first variable speed fan operates independently of the second variable speed fan.
- a first compartment passageway has a first compartment passageway inlet located upstream of the first heat exchanger.
- the first variable speed fan is located downstream of the first heat exchanger.
- a first nozzle is downstream of the first variable speed fan and has a first compartment outlet.
- a second compartment passageway has a second compartment passageway inlet located upstream of the second heat exchanger.
- a second variable speed fan is located downstream of the second heat exchanger.
- a second nozzle is downstream of the second variable speed fan and has a second compartment outlet.
- the first compartment outlet is spaced from the second compartment outlet.
- the first variable speed fan includes a plurality of first variable speed fans.
- the second variable speed fan includes a plurality of second variable speed fans.
- the first heat exchanger is in parallel to the second heat exchanger.
- a first expansion device is upstream of the first heat exchanger.
- the first expansion device is a first electronically controlled expansion valve.
- a controller is configured to control refrigerant flow to the first heat exchanger by controlling the first electronically controlled expansion valve.
- a second expansion device is upstream of the second heat exchanger.
- the second expansion device is a second electronically controlled expansion valve.
- the controller is configured to control refrigerant flow to the second heat exchanger by controlling the second electronically controlled expansion valve.
- a method of operating a refrigeration cycle includes the steps of conditioning a first compartment in a cargo space and a first heat exchanger by operating a first variable speed fan at a first speed. Conditioning a second compartment in the cargo space a second heat exchanger by operating a second variable speed fan at a second speed. The first speed is different from the second speed.
- operating the first variable speed fan includes drawing air from the first compartment into a first compartment passageway inlet, over the first heat exchanger and through a first nozzle having a first compartment passageway outlet.
- operating the second variable speed fan includes drawing air from the second compartment into a second compartment passageway inlet, over the second heat exchanger and through a second nozzle having a second compartment passageway outlet spaced from the first compartment passageway outlet.
- refrigerant flow is controlled through a first electronically controlled expansion valve upstream of the first heat exchanger with a controller in electrical communication with the first electronically controlled expansion valve.
- FIG. 1 is a schematic view illustrating a transport refrigeration system.
- FIG. 2 is a schematic view of the air flow over a pair of absorption heat exchangers.
- FIG. 1 illustrates a transport refrigeration system 20 associated with a cargo space 22 , such as a refrigerated cargo space.
- the cargo space 22 is divided into a first compartment 22 A and a second compartment 22 B by a dividing wall 23 .
- a controller 24 manages operation of the refrigeration system 20 to establish and regulate a desired product storage temperature within the first compartment 22 A and the second compartment 22 B of the cargo space 22 .
- the cargo space 22 may be the cargo box of a trailer, a truck, a seaboard shipping container or an intermodal container wherein perishable cargo, such as, for example, produce, meat, poultry, fish, dairy products, cut flowers, and other fresh or frozen perishable products, is stowed for transport.
- the refrigeration system 20 includes a refrigerant compression device 26 , a refrigerant rejection heat exchanger 28 , a first expansion device 30 A, a second expansion device 30 B, a first refrigerant absorption heat exchanger 32 A, and a second refrigerant absorption heat exchanger 32 B connected in a closed loop refrigerant circuit and arranged in a conventional refrigeration cycle.
- the first and second expansion devices 30 A, 30 B can be electrically controlled expansion valves controlled by the controller 24 to regulator refrigerant flow through each of the first and second absorption heat exchangers 32 A, 32 B, respectively.
- the refrigeration system 20 also includes one or more fans 34 associated with the rejection heat exchanger 28 and a first and second fan 36 A, 36 B associated with each of the first and second absorption heat exchangers 32 A, 32 B.
- the first and second absorption heat exchangers 32 A, 32 B are evaporators.
- refrigerant circuit may be incorporated into the refrigerant circuit as desired, including for example, but not limited to, a suction modulation valve, a receiver, a filter/dryer, an economizer circuit.
- the rejection heat exchanger 28 may, for example, comprise one or more refrigerant conveying coiled tubes or one or more tube banks formed of a plurality of refrigerant conveying tubes extending between respective inlet and outlet manifolds.
- the fan(s) 34 are operative to pass air, typically ambient air, across the tubes of the refrigerant rejection heat exchanger 28 to cool refrigerant vapor passing through the tubes.
- the first and second absorption heat exchangers 32 A, 32 B may, for example, also comprise one or more refrigerant conveying coiled tubes or one or more tube banks formed of a plurality of refrigerant conveying tubes extending between respective inlet and outlet manifolds.
- the first and second fans 36 A, 36 B are operative to pass air drawn from the temperature controlled cargo space 22 across the tubes of the absorption heat exchangers 32 A, 32 B to heat the refrigerant passing through the tubes and cool the air.
- the air cooled in traversing the absorption heat exchangers 32 A, 32 B is supplied back to a respective first and second compartment 22 A, 22 B in the cargo space 22 .
- first and second fan 36 A, 36 B are shown in the illustrated embodiment, multiple first and second fans 36 A, 36 B could be associated with the first and second absorption heat exchangers 32 A, 32 B, respectively.
- the refrigerant compression device 26 Prior to entering the refrigerant compression device 26 , the refrigerant passes through an outlet valve 38 .
- the outlet valve 38 controls a pressure and state of the refrigerant entering the refrigerant compression device 26 .
- the refrigerant compression device 26 may comprise a single-stage or multiple-stage compressor such as, for example, a reciprocating compressor or a scroll compressor.
- the controller 24 is configured for controlling operation of the refrigeration system 20 including, but not limited to, operation of the various components of the refrigerant system 20 to provide and maintain a desired operating temperature within the cargo space 22 .
- the controller 24 may be an electronic controller including a microprocessor and an associated memory bank.
- the controller 24 controls operation of various components of the refrigeration system 20 , such as the refrigerant compression device 26 , the first and second expansion devices 30 A, 30 B, the fans 34 , 36 A, 36 B, and the outlet valve 38 .
- FIG. 2 schematically illustrates air flow from the first and second compartments 22 A, 22 B through a respective first and second absorption heat exchanger 32 A, 32 B.
- the air flow from the first compartment 22 A flows through a first compartment passageway 40 A and back into the first compartment 22 A.
- the first compartment passageway 40 A includes a first compartment passageway inlet 42 A that accepts air from the first compartment 22 A into the first compartment passageway 40 A. From the first compartment passageway inlet 42 A, the air is drawn by the first fan 36 A over the first absorption heat exchanger 32 A and into a first nozzle 44 A. From the first nozzle 44 A, the air exits the first compartment passageway 40 A through a first compartment passageway outlet 46 A and travels back into the first compartment 22 A.
- the second compartment passageway 40 B includes a second compartment passageway inlet 42 B that accepts air from the second compartment 22 B into the second compartment passageway 40 B. From the second compartment passageway inlet 42 B, the air is drawn by the second fan 36 B over the second absorption heat exchanger 32 B and into a second nozzle 44 B. From the second nozzle 44 B, the air exits the second compartment passageway 40 B through a second compartment passageway outlet 46 B and travels back into the second compartment 22 B.
- the first and second compartments 22 A, 22 B could be unequally sized in volume.
- the fan 36 A, 36 B associated with the larger of the first and second compartments 22 A, 22 B could run at a high speed than the fan 36 A, 36 B associated with the smaller of the two compartments.
- the first and second compartments 22 A, 22 B could be the same size but have different cooling requirements.
- the refrigeration system 20 is able to operate more efficiently by operating the first and second fans 36 A, 36 B at an optimal speed that does not exceed demand for the respective first and second compartments 22 A, 22 B. Additionally, one of the first and second fans 36 A, 36 B could be rotating while the other of the first and second fans 36 A, 36 B could be stationary. In addition to varying speed between the first and second fans 36 A, 36 B, the first and second fans 36 A, 36 B can have different maximum flow rates to meet the cooling needs of the first and second compartments 22 A, 22 B. This can be achieved by changing a geometry, such as diameter and/or pitch, of the fan blades of the individual first and second fans 36 A, 36 B.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
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- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A transportation refrigeration system includes a refrigeration circuit that includes a compressor, a condenser, a first heat exchanger and a second heat exchanger. A first variable speed fan is associated with the first heat exchanger and a second variable speed fan is associated the second heat exchanger.
Description
- This application claims priority to U.S. Provisional Application No. 62/657,259, which was filed on Apr. 13, 2018 and is incorporated herein by reference.
- This application relates to refrigeration systems having at least two fans for cooling an enclosed cargo space.
- Refrigeration systems are known. Generally, a compressor compresses a refrigerant and delivers it into a condenser. The refrigerant is cooled and passes through an expansion valve. The refrigerant is expanded and passes through an evaporator. The evaporator cools air to be delivered into an environment to be conditioned.
- One application for such refrigeration systems is in a transportation refrigeration system. As an example, a truck may have a refrigerated trailer. It is known to provide distinct temperatures at distinct compartments within a common trailer. Individual refrigeration circuits are often utilized to provide the distinct temperatures.
- In one exemplary embodiment, a transportation refrigeration system includes a refrigeration circuit that includes a compressor, a condenser, a first heat exchanger and a second heat exchanger. A first variable speed fan is associated with the first heat exchanger and a second variable speed fan is associated the second heat exchanger.
- In a further embodiment of any of the above, the first variable speed fan operates independently of the second variable speed fan.
- In a further embodiment of any of the above, a first compartment passageway has a first compartment passageway inlet located upstream of the first heat exchanger. The first variable speed fan is located downstream of the first heat exchanger.
- In a further embodiment of any of the above, a first nozzle is downstream of the first variable speed fan and has a first compartment outlet.
- In a further embodiment of any of the above, a second compartment passageway has a second compartment passageway inlet located upstream of the second heat exchanger. A second variable speed fan is located downstream of the second heat exchanger.
- In a further embodiment of any of the above, a second nozzle is downstream of the second variable speed fan and has a second compartment outlet.
- In a further embodiment of any of the above, the first compartment outlet is spaced from the second compartment outlet.
- In a further embodiment of any of the above, the first variable speed fan includes a plurality of first variable speed fans.
- In a further embodiment of any of the above, the second variable speed fan includes a plurality of second variable speed fans.
- In a further embodiment of any of the above, the first heat exchanger is in parallel to the second heat exchanger.
- In a further embodiment of any of the above, a first expansion device is upstream of the first heat exchanger.
- In a further embodiment of any of the above, the first expansion device is a first electronically controlled expansion valve. A controller is configured to control refrigerant flow to the first heat exchanger by controlling the first electronically controlled expansion valve.
- In a further embodiment of any of the above, a second expansion device is upstream of the second heat exchanger.
- In a further embodiment of any of the above, the second expansion device is a second electronically controlled expansion valve. The controller is configured to control refrigerant flow to the second heat exchanger by controlling the second electronically controlled expansion valve.
- In another exemplary embodiment, a method of operating a refrigeration cycle includes the steps of conditioning a first compartment in a cargo space and a first heat exchanger by operating a first variable speed fan at a first speed. Conditioning a second compartment in the cargo space a second heat exchanger by operating a second variable speed fan at a second speed. The first speed is different from the second speed.
- In a further embodiment of any of the above, operating the first variable speed fan includes drawing air from the first compartment into a first compartment passageway inlet, over the first heat exchanger and through a first nozzle having a first compartment passageway outlet.
- In a further embodiment of any of the above, operating the second variable speed fan includes drawing air from the second compartment into a second compartment passageway inlet, over the second heat exchanger and through a second nozzle having a second compartment passageway outlet spaced from the first compartment passageway outlet.
- In a further embodiment of any of the above, refrigerant flow is controlled through a first electronically controlled expansion valve upstream of the first heat exchanger with a controller in electrical communication with the first electronically controlled expansion valve.
- In a further embodiment of any of the above, controlling refrigerant flow through a second electronically controlled expansion valve upstream of the second heat exchanger with a controller in electrical communication with the second electronically controlled expansion valve.
- In a further embodiment of any of the above, operating the first variable speed fan at a first maximum flow rate and operating a second variable speed fan at a second maximum flow rate that is less than the first maximum flow rate.
-
FIG. 1 is a schematic view illustrating a transport refrigeration system. -
FIG. 2 is a schematic view of the air flow over a pair of absorption heat exchangers. -
FIG. 1 illustrates atransport refrigeration system 20 associated with acargo space 22, such as a refrigerated cargo space. In the illustrated example, thecargo space 22 is divided into afirst compartment 22A and asecond compartment 22B by a dividingwall 23. - A
controller 24 manages operation of therefrigeration system 20 to establish and regulate a desired product storage temperature within thefirst compartment 22A and thesecond compartment 22B of thecargo space 22. Thecargo space 22 may be the cargo box of a trailer, a truck, a seaboard shipping container or an intermodal container wherein perishable cargo, such as, for example, produce, meat, poultry, fish, dairy products, cut flowers, and other fresh or frozen perishable products, is stowed for transport. - The
refrigeration system 20 includes arefrigerant compression device 26, a refrigerantrejection heat exchanger 28, afirst expansion device 30A, asecond expansion device 30B, a first refrigerantabsorption heat exchanger 32A, and a second refrigerantabsorption heat exchanger 32B connected in a closed loop refrigerant circuit and arranged in a conventional refrigeration cycle. The first andsecond expansion devices controller 24 to regulator refrigerant flow through each of the first and secondabsorption heat exchangers refrigeration system 20 also includes one ormore fans 34 associated with therejection heat exchanger 28 and a first andsecond fan absorption heat exchangers absorption heat exchangers - It is to be understood that other components (not shown) may be incorporated into the refrigerant circuit as desired, including for example, but not limited to, a suction modulation valve, a receiver, a filter/dryer, an economizer circuit.
- The
rejection heat exchanger 28 may, for example, comprise one or more refrigerant conveying coiled tubes or one or more tube banks formed of a plurality of refrigerant conveying tubes extending between respective inlet and outlet manifolds. The fan(s) 34 are operative to pass air, typically ambient air, across the tubes of the refrigerantrejection heat exchanger 28 to cool refrigerant vapor passing through the tubes. - The first and second
absorption heat exchangers second fans cargo space 22 across the tubes of theabsorption heat exchangers absorption heat exchangers second compartment cargo space 22. Although only a single first andsecond fan second fans absorption heat exchangers - Prior to entering the
refrigerant compression device 26, the refrigerant passes through anoutlet valve 38. Theoutlet valve 38 controls a pressure and state of the refrigerant entering therefrigerant compression device 26. Therefrigerant compression device 26 may comprise a single-stage or multiple-stage compressor such as, for example, a reciprocating compressor or a scroll compressor. - In the
refrigeration system 20, thecontroller 24 is configured for controlling operation of therefrigeration system 20 including, but not limited to, operation of the various components of therefrigerant system 20 to provide and maintain a desired operating temperature within thecargo space 22. Thecontroller 24 may be an electronic controller including a microprocessor and an associated memory bank. Thecontroller 24 controls operation of various components of therefrigeration system 20, such as therefrigerant compression device 26, the first andsecond expansion devices fans outlet valve 38. -
FIG. 2 schematically illustrates air flow from the first andsecond compartments absorption heat exchanger first compartment 22A flows through afirst compartment passageway 40A and back into thefirst compartment 22A. Thefirst compartment passageway 40A includes a firstcompartment passageway inlet 42A that accepts air from thefirst compartment 22A into thefirst compartment passageway 40A. From the firstcompartment passageway inlet 42A, the air is drawn by thefirst fan 36A over the firstabsorption heat exchanger 32A and into afirst nozzle 44A. From thefirst nozzle 44A, the air exits thefirst compartment passageway 40A through a first compartment passageway outlet 46A and travels back into thefirst compartment 22A. - Similarly, the air flow from the
second compartment 22B flows through asecond compartment passageway 40B and back into thesecond compartment 22B. Thesecond compartment passageway 40B includes a secondcompartment passageway inlet 42B that accepts air from thesecond compartment 22B into thesecond compartment passageway 40B. From the secondcompartment passageway inlet 42B, the air is drawn by thesecond fan 36B over the secondabsorption heat exchanger 32B and into asecond nozzle 44B. From thesecond nozzle 44B, the air exits thesecond compartment passageway 40B through a secondcompartment passageway outlet 46B and travels back into thesecond compartment 22B. - In one example, the first and
second compartments fan second compartments fan second compartments - Because the first and
second fans refrigeration system 20 is able to operate more efficiently by operating the first andsecond fans second compartments second fans second fans second fans second fans second compartments second fans - The preceding description is exemplary rather than limiting in nature. Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this disclosure. The scope of legal protection given to this disclosure can only be determined by studying the following claims.
Claims (20)
1. A transportation refrigeration system comprising:
a refrigeration circuit including a compressor, a condenser, a first heat exchanger, and a second heat exchanger, wherein a first variable speed fan is associated with the first heat exchanger and a second variable speed fan is associated the second heat exchanger.
2. The transportation refrigeration system of claim 1 , wherein the first variable speed fan operates independently of the second variable speed fan.
3. The transportation refrigeration system of claim 1 , further comprising a first compartment passageway having a first compartment passageway inlet located upstream of the first heat exchanger and the first variable speed fan located downstream of the first heat exchanger.
4. The transportation refrigeration system of claim 3 , including a first nozzle downstream of the first variable speed fan having a first compartment outlet.
5. The transportation refrigeration system of claim 4 , further comprising a second compartment passageway having a second compartment passageway inlet located upstream of the second heat exchanger and a second variable speed fan located downstream of the second heat exchanger.
6. The transportation refrigeration system of claim 5 , including a second nozzle downstream of the second variable speed fan having a second compartment outlet.
7. The transportation refrigeration system of claim 6 , wherein the first compartment outlet is spaced from the second compartment outlet.
8. The transportation refrigeration system of claim 7 , wherein the first variable speed fan includes a plurality of first variable speed fans.
9. The transportation refrigeration system of claim 8 , wherein the second variable speed fan includes a plurality of second variable speed fans.
10. The transportation refrigeration system of claim 1 , wherein the first heat exchanger is in parallel to the second heat exchanger.
11. The transportation refrigeration system of claim 10 , further comprising a first expansion device upstream of the first heat exchanger.
12. The transportation refrigeration system of claim 11 , wherein the first expansion device is a first electronically controlled expansion valve and a controller is configured to control refrigerant flow to the first heat exchanger by controlling the first electronically controlled expansion valve.
13. The transportation refrigeration system of claim 12 , further comprising a second expansion device upstream of the second heat exchanger.
14. The transportation refrigeration system of claim 13 , and the second expansion device is a second electronically controlled expansion valve and the controller is configured to control refrigerant flow to the second heat exchanger by controlling the second electronically controlled expansion valve.
15. A method of operating a refrigeration cycle comprising the steps of:
conditioning a first compartment in a cargo space a first heat exchanger by operating a first variable speed fan at a first speed; and
conditioning a second compartment in the cargo space a second heat exchanger by operating a second variable speed fan at a second speed; wherein the first speed is different from the second speed.
16. The method of claim 15 , wherein operating the first variable speed fan includes drawing air from the first compartment into a first compartment passageway inlet, over the first heat exchanger and through a first nozzle having a first compartment passageway outlet.
17. The method of claim 16 , wherein operating the second variable speed fan includes drawing air from the second compartment into a second compartment passageway inlet, over the second heat exchanger and through a second nozzle having a second compartment passageway outlet spaced from the first compartment passageway outlet.
18. The method of claim 15 , further comprising:
controlling refrigerant flow through a first electronically controlled expansion valve upstream of the first heat exchanger with a controller in electrical communication with the first electronically controlled expansion valve.
19. The method of claim 18 , further comprising:
controlling refrigerant flow through a second electronically controlled expansion valve upstream of the second heat exchanger with a controller in electrical communication with the second electronically controlled expansion valve.
20. The method of claim 15 , further comprising:
operating the first variable speed fan at a first maximum flow rate; and
operating a second variable speed fan at a second maximum flow rate that is less than the first maximum flow rate.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US16/290,261 US20190316828A1 (en) | 2018-04-13 | 2019-03-01 | Transportation refrigeration system having multiple fans |
CN201910294140.7A CN110375471A (en) | 2018-04-13 | 2019-04-12 | Transport refrigeration system with multiple fans |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201862657259P | 2018-04-13 | 2018-04-13 | |
US16/290,261 US20190316828A1 (en) | 2018-04-13 | 2019-03-01 | Transportation refrigeration system having multiple fans |
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US20190316828A1 true US20190316828A1 (en) | 2019-10-17 |
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US16/290,261 Abandoned US20190316828A1 (en) | 2018-04-13 | 2019-03-01 | Transportation refrigeration system having multiple fans |
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US (1) | US20190316828A1 (en) |
CN (1) | CN110375471A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11371768B2 (en) * | 2018-12-28 | 2022-06-28 | Lg Electronics Inc. | Refrigerator and method for controlling the same |
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US4326452A (en) * | 1977-10-24 | 1982-04-27 | Matsushita Electric Industrial Co., Ltd. | Fluid diverting assembly |
US5467606A (en) * | 1992-10-28 | 1995-11-21 | Kabushiki Kaisha Toshiba | Air conditioning apparatus capable of operating in cooling mode and heating mode |
US20150068231A1 (en) * | 2013-09-07 | 2015-03-12 | Trane International Inc. | HVAC System with Electronically Controlled Expansion Valve |
US9297548B2 (en) * | 2008-10-31 | 2016-03-29 | Carrier Corporation | Control of multiple zone refrigerant vapor compression systems |
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KR100224999B1 (en) * | 1993-06-09 | 1999-10-15 | 구자홍 | Air distribution apparatus of a refrigerator |
CN104677050A (en) * | 2014-11-28 | 2015-06-03 | 中山市新顺翔电器制造有限公司 | Dual temperature zone wine cabinet |
CN107014137A (en) * | 2017-05-24 | 2017-08-04 | 合肥美菱股份有限公司 | A kind of wind cooling refrigerator |
-
2019
- 2019-03-01 US US16/290,261 patent/US20190316828A1/en not_active Abandoned
- 2019-04-12 CN CN201910294140.7A patent/CN110375471A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4326452A (en) * | 1977-10-24 | 1982-04-27 | Matsushita Electric Industrial Co., Ltd. | Fluid diverting assembly |
US5467606A (en) * | 1992-10-28 | 1995-11-21 | Kabushiki Kaisha Toshiba | Air conditioning apparatus capable of operating in cooling mode and heating mode |
US9297548B2 (en) * | 2008-10-31 | 2016-03-29 | Carrier Corporation | Control of multiple zone refrigerant vapor compression systems |
US20150068231A1 (en) * | 2013-09-07 | 2015-03-12 | Trane International Inc. | HVAC System with Electronically Controlled Expansion Valve |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11371768B2 (en) * | 2018-12-28 | 2022-06-28 | Lg Electronics Inc. | Refrigerator and method for controlling the same |
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CN110375471A (en) | 2019-10-25 |
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