EP1872068B1 - Multi-part heat exchanger - Google Patents
Multi-part heat exchanger Download PDFInfo
- Publication number
- EP1872068B1 EP1872068B1 EP05856004.6A EP05856004A EP1872068B1 EP 1872068 B1 EP1872068 B1 EP 1872068B1 EP 05856004 A EP05856004 A EP 05856004A EP 1872068 B1 EP1872068 B1 EP 1872068B1
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- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- component
- heat
- refrigerant
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003507 refrigerant Substances 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 3
- 235000013361 beverage Nutrition 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
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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
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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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/02—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors plug-in type
-
- 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
-
- 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
- F25D23/003—General constructional features for cooling refrigerating machinery
-
- 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
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
- F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return
- F25D2317/0651—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return through the bottom
-
- 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
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
- F25D2317/066—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply
- F25D2317/0661—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply from the bottom
-
- 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
- F25D2323/00—General constructional features not provided for in other groups of this subclass
- F25D2323/002—Details for cooling refrigerating machinery
- F25D2323/0026—Details for cooling refrigerating machinery characterised by the incoming air flow
- F25D2323/00264—Details for cooling refrigerating machinery characterised by the incoming air flow through the front bottom part
-
- 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
- F25D2323/00—General constructional features not provided for in other groups of this subclass
- F25D2323/002—Details for cooling refrigerating machinery
- F25D2323/0027—Details for cooling refrigerating machinery characterised by the out-flowing air
- F25D2323/00271—Details for cooling refrigerating machinery characterised by the out-flowing air from the back bottom
-
- 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
- F25D2500/00—Problems to be solved
- F25D2500/02—Geometry problems
Definitions
- the invention relates to vapor compression systems and, more particularly, to a heat exchanger configuration for such a system.
- An exemplary heat exchanger system according to the preamble of claim 1 is disclosed in JP 6-207773 .
- the heat exchanger placement is very much constrained by space.
- the efficiency of the system is often low in comparison to a system with a properly sized heat exchanger due to the large temperature difference between the air and the refrigerant in the heat exchangers.
- the present invention provides a refrigeration system comprising: a compressor for driving a refrigerant along a flow path in at least a first mode of system operation; a first heat exchanger along the flow path downstream of the compressor in the first mode; a second heat exchanger along the flow path upstream of the compressor in the first mode; and an expansion device in the flow path downstream of the first heat exchanger and upstream of the second heat exchanger in the first mode, wherein the first heat exchanger comprises at least a first heat exchanger component and a second heat exchanger component arranged along a flow path of heat exchange fluid for the first heat exchanger, the first heat exchanger component being downstream of the second heat exchanger in the first mode; and wherein a fan is arranged to provide a flow of heat exchange medium past the first heat exchanger, such that the first heat exchanger component is upstream of the second heat exchanger component in the flow of heat exchange medium; characterised by a refrigerator housing defining a cassette receiving area, wherein the heat exchanger components are mounted within a cassette adapted to be inserted into
- the invention relates to a vapor compression system of a refrigerator unit and, more particularly, to the arrangement of a heat exchanger in a vapor compression system, preferably in a transcritical vapor compression system.
- greater contact area between the heat exchanger and heat exchange medium is obtained by utilizing all potentially available spaces within a particular vapor compression system to house additional components of a heat exchanger, such that the heat exchanger is implemented in a series or plurality of heat exchange components. In this manner, small available spaces are nevertheless utilized to increase heat exchange efficiency and, therefore, efficiency of the overall system.
- FIG. 1 shows a system in accordance with the present invention.
- system 10 which, in this particular embodiment, is the vapor compression system for a bottle cooler refrigeration assembly.
- FIG. 1 shows the lower portion of such an assembly, including a housing 12 containing a vapor compression system.
- FIGS.1 - 3 for further discussion of the vapor compression system, which includes a compressor 14, a downstream heat exchanger 16, an expansion device 18 and an evaporator 20.
- Compressor 14 is operative to drive a refrigerant along refrigerant lines ( FIG.3 ) first to heat exchanger 16, then to expansion device 18, and then to evaporator 20. Refrigerant flows from evaporator 20 back to compressor 14 to complete the circuit.
- first heat exchanger 16 is provided having a first heat exchange component 22 and a second heat exchange component 24. These components are positioned within housing 12 to take advantage of the spaces available such that high amounts of heat exchange can be accomplished with relatively small available spaces.
- housing 12 defines a flow path for heat exchange medium, for example air, to enter into heat exchange relationship with first heat exchanger 16.
- An upper portion of housing 12 also defines a flow path for air from within the refrigerated space (not shown, but located above housing 12 and supplied with air cooled by arrows 27) to be treated with second heat exchanger 20.
- first and second components 22, 24 of first heat exchanger 16 can and most likely will be different in size and/or shape so that these components can advantageously take advantage of the available space within a particular device.
- first component 22 has a relatively larger area in a transverse plane with respect to the flow, and is relatively thin from front to back. This is because first component 22 in this embodiment is sized to fit within a relatively narrow (from front to back) space toward the open front of housing 12.
- a second space within housing 12 in this embodiment is available beneath a wall 28 which separates one portion of housing 12 for treating the first flow of air 26 from a second portion of housing 12 for treating the second portion of air 27.
- This wall 28 extends downwardly relative to the outer contour of housing 12, and results in a restriction in flow area as air flows from the inlet end 30 to the outlet end 32 of housing 12.
- This zone of decreased cross sectional flow area results in an increase in velocity of the air flowing through this zone.
- An increased velocity flow has been found to provide improved efficiency heat exchange in heat exchangers such as that of the present invention.
- this zone has a substantially short height and yet extends much further from the inlet side toward the outlet side as compared to the space for accommodating first component 22.
- second component 24 is advantageously shaped and adapted to fit properly within this space, thereby providing maximum possible heat exchange area and further taking advantage of the increased flow velocity of air through that zone.
- one preferred implementation of the vapor compression system in accordance with the present invention is a transcritical vapor compression system.
- a transcritical vapor compression system operates upon a refrigerant which does not condense in the first heat exchanger.
- a refrigerant of a transcritical vapor compression system is CO 2 .
- other refrigerants could be used well within the scope of the present invention to provide suitable vapor compression systems which would benefit from the heat exchanger arrangement of the present invention.
- Expansion device 18 can be any suitable expansion device for decreasing the pressure of refrigerant passing there through as is known to a person of skill in the art. Various known expansion devices could be utilized for this purpose.
- a pressure regulator such as that disclosed in WO 2006/101566 , is a particularly desirable type of expansion device for use in connection with the present invention. As used herein, the term expansion device is considered to include such a pressure regulator.
- Second heat exchanger 20 which performs the function of an evaporator, is shown as a single heat exchanger in the drawings. It should be appreciated that second heat exchanger 20 could also be provided in a plurality of components, as well, in the event that space for treatment of flow of air from the refrigerated space is particularly small and/or irregularly shaped.
- FIG. 3 shows refrigerant lines connecting from first heat exchanger 16 to expansion device 18 and then to second heat exchanger or evaporator 20. Refrigerant flows from evaporator 20 back to the suction inlet of compressor 14.
- the present invention provides for increased heat exchange efficiency due to increase in area of contact between the heat exchanger and the heat exchange medium. It should further be appreciated that the system of the present invention provides for enhanced utilization of space available for heat exchange, thereby providing more efficient operation of a vapor compression system as desired in accordance with the present invention.
- FIG. 2 shows an example with a two part heat exchanger.
- the refrigerant flow would be circuited first through component 24 and then through component 22 if the air flow was directed from front to back.
- the refrigerant flow would be circuited first through component 22 and then through component 24 if the air flow was from back to front.
- This concept is especially useful for transcritical vapor compression systems (such as using CO 2 ), where it is critically important for efficiency that the temperature of refrigerant leaving the heat rejecting heat exchanger be as close as possible to the heat sink fluid (typically air) entering the heat exchanger.
- the individual heat exchanger segments or components could also be circuited to be as counterflow as possible to further enhance this effect.
- the segments or components of the heat exchanger could be manufactured and shipped as one piece, or separately manufactured and connected during the unit assembly process.
- This type of a heat exchanger is particularly useful for applications where a low number of fins are used on the heat exchanger for reasons of fouling.
- the reduction in fins due to fouling concerns is offset by the additional heat exchanger tube or channel surface area.
- This heat exchanger could be a round tube plate fin, wire on tube, microchannel, or any other configuration.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Description
- The invention relates to vapor compression systems and, more particularly, to a heat exchanger configuration for such a system. An exemplary heat exchanger system according to the preamble of claim 1 is disclosed in
JP 6-207773 - In many vapor compression systems, the heat exchanger placement is very much constrained by space. For these applications, the efficiency of the system is often low in comparison to a system with a properly sized heat exchanger due to the large temperature difference between the air and the refrigerant in the heat exchangers.
- The need exists for more efficient heat exchange despite space requirements of the system, and it is an object of the invention to provide such a system.
- Other objects and advantages will appear herein below.
- According to the present invention, the foregoing objects and advantages have been attained.
- The present invention provides a refrigeration system comprising: a compressor for driving a refrigerant along a flow path in at least a first mode of system operation; a first heat exchanger along the flow path downstream of the compressor in the first mode; a second heat exchanger along the flow path upstream of the compressor in the first mode; and an expansion device in the flow path downstream of the first heat exchanger and upstream of the second heat exchanger in the first mode, wherein the first heat exchanger comprises at least a first heat exchanger component and a second heat exchanger component arranged along a flow path of heat exchange fluid for the first heat exchanger, the first heat exchanger component being downstream of the second heat exchanger in the first mode; and wherein a fan is arranged to provide a flow of heat exchange medium past the first heat exchanger, such that the first heat exchanger component is upstream of the second heat exchanger component in the flow of heat exchange medium; characterised by a refrigerator housing defining a cassette receiving area, wherein the heat exchanger components are mounted within a cassette adapted to be inserted into the receiving area, and wherein the second heat exchanger component is in a zone of decreased cross-sectional flow area in the flow of heat exchange medium, whereby the velocity is increased.
- A detailed description of preferred embodiments of the invention follows with reference to the attached drawings, wherein:
-
FIG. 1 is a perspective view of a system having a multi-part heat exchanger according to the invention; -
FIG. 2 is a schematic illustration of a multi-part heat exchanger system according to the invention: and -
FIG. 3 illustrates the refrigerant and air flow in a system according to the invention. - The invention relates to a vapor compression system of a refrigerator unit and, more particularly, to the arrangement of a heat exchanger in a vapor compression system, preferably in a transcritical vapor compression system.
- As set forth above, the greater the area of heat exchanger contact with heat exchange medium such as air, the greater the efficiency in operation of a vapor compression system. In accordance with the present invention, greater contact area between the heat exchanger and heat exchange medium is obtained by utilizing all potentially available spaces within a particular vapor compression system to house additional components of a heat exchanger, such that the heat exchanger is implemented in a series or plurality of heat exchange components. In this manner, small available spaces are nevertheless utilized to increase heat exchange efficiency and, therefore, efficiency of the overall system.
-
FIG. 1 shows a system in accordance with the present invention.FIG. 1 showssystem 10 which, in this particular embodiment, is the vapor compression system for a bottle cooler refrigeration assembly.FIG. 1 shows the lower portion of such an assembly, including ahousing 12 containing a vapor compression system. Reference is made toFIGS.1 - 3 for further discussion of the vapor compression system, which includes acompressor 14, adownstream heat exchanger 16, anexpansion device 18 and anevaporator 20.Compressor 14 is operative to drive a refrigerant along refrigerant lines (FIG.3 ) first toheat exchanger 16, then toexpansion device 18, and then toevaporator 20. Refrigerant flows fromevaporator 20 back tocompressor 14 to complete the circuit. - In accordance with the present invention,
first heat exchanger 16 is provided having a firstheat exchange component 22 and a secondheat exchange component 24. These components are positioned withinhousing 12 to take advantage of the spaces available such that high amounts of heat exchange can be accomplished with relatively small available spaces. - As illustrated in the drawings,
housing 12 defines a flow path for heat exchange medium, for example air, to enter into heat exchange relationship withfirst heat exchanger 16. An upper portion ofhousing 12 also defines a flow path for air from within the refrigerated space (not shown, but located abovehousing 12 and supplied with air cooled by arrows 27) to be treated withsecond heat exchanger 20. - In connection with any heat exchange system, and particularly in connection with vapor compression systems which form the preferred embodiment of the present invention, extended area of heat exchange contact between the heat exchange medium and the refrigerant-carrying heat exchangers is critical to obtaining good efficiency of the system. It has also been found that such systems operate most efficiently with counter-current flow of refrigerant verses heat exchange medium. That is, referring to
FIG. 3 , if heat exchange medium or air is flowing in the direction ofarrows 26, it is preferred that refrigerant flow throughheat exchanger 16 be in the flow direction shown such that the direction of flow of refrigerant is counter to that of the flow of heat exchange medium. Referring further toFIGS. 1 - 3 , it should readily apparent that first andsecond components first heat exchanger 16 can and most likely will be different in size and/or shape so that these components can advantageously take advantage of the available space within a particular device. For example, in the embodiment shown,first component 22 has a relatively larger area in a transverse plane with respect to the flow, and is relatively thin from front to back. This is becausefirst component 22 in this embodiment is sized to fit within a relatively narrow (from front to back) space toward the open front ofhousing 12. A second space withinhousing 12 in this embodiment is available beneath awall 28 which separates one portion ofhousing 12 for treating the first flow ofair 26 from a second portion ofhousing 12 for treating the second portion ofair 27. Thiswall 28 extends downwardly relative to the outer contour ofhousing 12, and results in a restriction in flow area as air flows from theinlet end 30 to theoutlet end 32 ofhousing 12. This zone of decreased cross sectional flow area results in an increase in velocity of the air flowing through this zone. An increased velocity flow has been found to provide improved efficiency heat exchange in heat exchangers such as that of the present invention. According to the invention, it is preferred to positionsecond component 24 offirst heat exchanger 16 within this zone of decreased cross sectional flow area so as to take advantage of the increased flow of velocity in this zone: Further, the shape of this zone dictates a different configuration forsecond component 24 as compared tofirst component 22. Specifically, this zone has a substantially short height and yet extends much further from the inlet side toward the outlet side as compared to the space for accommodatingfirst component 22. Thus,second component 24 is advantageously shaped and adapted to fit properly within this space, thereby providing maximum possible heat exchange area and further taking advantage of the increased flow velocity of air through that zone. - As set forth above, one preferred implementation of the vapor compression system in accordance with the present invention is a transcritical vapor compression system. Such a system, as is known to a person of skill in the art, operates upon a refrigerant which does not condense in the first heat exchanger. One example of a refrigerant of a transcritical vapor compression system is CO2. Of course, other refrigerants could be used well within the scope of the present invention to provide suitable vapor compression systems which would benefit from the heat exchanger arrangement of the present invention.
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Expansion device 18 can be any suitable expansion device for decreasing the pressure of refrigerant passing there through as is known to a person of skill in the art. Various known expansion devices could be utilized for this purpose. In accordance with a preferred aspect of the present invention, a pressure regulator, such as that disclosed inWO 2006/101566 , is a particularly desirable type of expansion device for use in connection with the present invention. As used herein, the term expansion device is considered to include such a pressure regulator. -
Second heat exchanger 20, which performs the function of an evaporator, is shown as a single heat exchanger in the drawings. It should be appreciated thatsecond heat exchanger 20 could also be provided in a plurality of components, as well, in the event that space for treatment of flow of air from the refrigerated space is particularly small and/or irregularly shaped. -
FIG. 3 shows refrigerant lines connecting fromfirst heat exchanger 16 toexpansion device 18 and then to second heat exchanger orevaporator 20. Refrigerant flows fromevaporator 20 back to the suction inlet ofcompressor 14. - It should be appreciated that the present invention provides for increased heat exchange efficiency due to increase in area of contact between the heat exchanger and the heat exchange medium. It should further be appreciated that the system of the present invention provides for enhanced utilization of space available for heat exchange, thereby providing more efficient operation of a vapor compression system as desired in accordance with the present invention.
- In some systems it is possible to use a heat exchanger divided into multiple parts and arranged where space is available to increase the overall heat transfer area of the heat exchanger. This disclosure makes use of this with the addition of arranging the multiple parts of the heat exchanger in such a way that the effective refrigerant flows and air (or other heat transfer mediums) flows are opposite to each other.
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FIG. 2 shows an example with a two part heat exchanger. In this case the refrigerant flow would be circuited first throughcomponent 24 and then throughcomponent 22 if the air flow was directed from front to back. The refrigerant flow would be circuited first throughcomponent 22 and then throughcomponent 24 if the air flow was from back to front. This concept is especially useful for transcritical vapor compression systems (such as using CO2), where it is critically important for efficiency that the temperature of refrigerant leaving the heat rejecting heat exchanger be as close as possible to the heat sink fluid (typically air) entering the heat exchanger. The individual heat exchanger segments or components could also be circuited to be as counterflow as possible to further enhance this effect. - In
FIG. 2 , only onefan 34 is used to move the heat transfer fluid (air) through all of theheat exchanger components - The segments or components of the heat exchanger could be manufactured and shipped as one piece, or separately manufactured and connected during the unit assembly process. This type of a heat exchanger is particularly useful for applications where a low number of fins are used on the heat exchanger for reasons of fouling. The reduction in fins due to fouling concerns is offset by the additional heat exchanger tube or channel surface area. This heat exchanger could be a round tube plate fin, wire on tube, microchannel, or any other configuration.
- One or more embodiments of the present invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from scope of the invention as claimed. For example, when implemented as a remanufacturing of an existing system or reengineering of an existing system configuration, details of the existing configuration may influence details of the implementation. Accordingly, other embodiments are within the scope of the following claims.
Claims (7)
- A refrigeration system (10) comprising:a compressor (14) for driving a refrigerant along a flow path in at least a first mode of system operation;a first heat exchanger (16) along the flow path downstream of the compressor in the first mode;a second heat exchanger (20) along the flow path upstream of the compressor in the first mode; andan expansion device (18) in the flow path downstream of the first heat exchanger and upstream of the second heat exchanger in the first mode,wherein the first heat exchanger comprises at least a first heat exchanger component (22) and a second heat exchanger component (24) arranged along a flow path of heat exchange fluid for the first heat exchanger, the first heat exchanger component (22) being downstream of the second heat exchanger component (24) in the first mode; andwherein a fan (34) is arranged to provide a flow of heat exchange medium past the first heat exchanger, such that the first heat exchanger component is upstream of the second heat exchanger component in the flow of heat exchange medium;characterised by a refrigerator housing defining a cassette receiving area, wherein the heat exchanger components (22, 24) are mounted within a cassette adapted to be inserted into the receiving area, and wherein the second heat exchanger component (24) is in a zone of decreased cross-sectional flow area in the flow of heat exchange medium, whereby the velocity is increased.
- The system of claim 1 wherein the second heat exchanger (20) also comprises a plurality of heat exchange components.
- The system of claim 1 wherein the first heat exchanger (16) is mounted within a housing having separate and discrete available spaces, and wherein the heat exchanger components (22, 24) are positioned in the spaces.
- The system of claim 1, wherein the first component (22) has a different shape than the second component (24).
- The system of claim 1, wherein the refrigerant comprises, in major mass part, CO2; and the first and second heat exchangers (16, 20) are refrigerant-air heat exchangers.
- The system of claim 1, wherein the system contains a refrigerant and the refrigerant is a transcritical vapor compression.
- A beverage cooling device comprising the system of claim 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66391705P | 2005-03-18 | 2005-03-18 | |
PCT/US2005/047524 WO2006101563A2 (en) | 2005-03-18 | 2005-12-30 | Multi-part heat exchanger |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1872068A2 EP1872068A2 (en) | 2008-01-02 |
EP1872068A4 EP1872068A4 (en) | 2011-11-16 |
EP1872068B1 true EP1872068B1 (en) | 2016-06-22 |
Family
ID=37024267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05856004.6A Active EP1872068B1 (en) | 2005-03-18 | 2005-12-30 | Multi-part heat exchanger |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080184731A1 (en) |
EP (1) | EP1872068B1 (en) |
JP (1) | JP4705157B2 (en) |
CN (1) | CN100575813C (en) |
ES (1) | ES2580080T3 (en) |
HK (1) | HK1120103A1 (en) |
WO (1) | WO2006101563A2 (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2936806B1 (en) | 2008-10-08 | 2012-08-31 | Arkema France | REFRIGERANT FLUID |
FR2950065B1 (en) | 2009-09-11 | 2012-02-03 | Arkema France | BINARY REFRIGERANT FLUID |
FR2950071B1 (en) | 2009-09-11 | 2012-02-03 | Arkema France | TERNARY COMPOSITIONS FOR LOW CAPACITY REFRIGERATION |
FR2950067B1 (en) * | 2009-09-11 | 2011-10-28 | Arkema France | HEAT TRANSFER FLUID IN REPLACEMENT OF R-410A |
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- 2005-12-30 JP JP2008501863A patent/JP4705157B2/en not_active Expired - Fee Related
- 2005-12-30 US US11/908,418 patent/US20080184731A1/en not_active Abandoned
- 2005-12-30 EP EP05856004.6A patent/EP1872068B1/en active Active
- 2005-12-30 WO PCT/US2005/047524 patent/WO2006101563A2/en active Application Filing
- 2005-12-30 CN CN200580049153A patent/CN100575813C/en active Active
- 2005-12-30 ES ES05856004.6T patent/ES2580080T3/en active Active
-
2008
- 2008-10-30 HK HK08111972.1A patent/HK1120103A1/en not_active IP Right Cessation
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Title |
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None * |
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JP4705157B2 (en) | 2011-06-22 |
EP1872068A4 (en) | 2011-11-16 |
WO2006101563A2 (en) | 2006-09-28 |
CN100575813C (en) | 2009-12-30 |
US20080184731A1 (en) | 2008-08-07 |
JP2008533425A (en) | 2008-08-21 |
CN101175952A (en) | 2008-05-07 |
HK1120103A1 (en) | 2009-03-20 |
WO2006101563A3 (en) | 2008-01-17 |
EP1872068A2 (en) | 2008-01-02 |
ES2580080T3 (en) | 2016-08-19 |
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