WO2007085264A2 - An evaporator in a cooling furniture - Google Patents

An evaporator in a cooling furniture Download PDF

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Publication number
WO2007085264A2
WO2007085264A2 PCT/DK2007/000040 DK2007000040W WO2007085264A2 WO 2007085264 A2 WO2007085264 A2 WO 2007085264A2 DK 2007000040 W DK2007000040 W DK 2007000040W WO 2007085264 A2 WO2007085264 A2 WO 2007085264A2
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
freezing
chilling
flow
shared
Prior art date
Application number
PCT/DK2007/000040
Other languages
French (fr)
Other versions
WO2007085264A3 (en
Inventor
Finn Guldager Christensen
Original Assignee
Knudsen Køling
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knudsen Køling filed Critical Knudsen Køling
Publication of WO2007085264A2 publication Critical patent/WO2007085264A2/en
Publication of WO2007085264A3 publication Critical patent/WO2007085264A3/en

Links

Classifications

    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F25B39/022—Evaporators with plate-like or laminated elements
    • 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
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/06—Several compression cycles arranged in parallel
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/22—Refrigeration systems for supermarkets

Definitions

  • the present invention relates to an evaporator that improves the efficiency of a cooling furniture that is used for both cooling and freezing of food, e.g. in a supermarket.
  • a cooling furniture for the display and handling of food is capable of operating as a freezing counter for frozen food during some time periods and as a chilling counter for chilled food during other time periods.
  • Cooling systems for freezing and chilling typically constitute separate systems with different refrigerants.
  • a cooling furniture that may operate both at a freezing temperature, e.g. - 18 0 C, and at a chilling temperature, e.g. 4 0 C, the evaporator of the cooling furniture is coupled to the freezing system, and the temperature control in the furniture is switched between two thermostats so that easy selection between the two desired temperatures is provided.
  • the cooling furniture operates with the efficiency of the freezing system, which is considerably lower than the efficiency of the chilling system.
  • a refrigeration system comprising a freezing system and a chilling system with flow circuits for recirculation of separate refrigerants, each of the flow circuits comprising a compressor for generation of a refrigerant flow from a low-pressure side to a high-pressure side of the compressor and, in the order defined by the flow direction, connected in series with a condenser for cooling of the refrigerant towards the ambient temperature, a pressure reducing device, such as a reduction valve, cooperating with the compressor for generation of the low-pressure side and the high pressure side of the compressor, and an evaporator for evaporation of the refrigerant, e.g. in a cooling furniture.
  • the evaporator is a shared evaporator that is shared by the freezing system and the chilling system and provides a separate flow path through the evaporator for each of the refrigerants of the freezing system and the chilling system.
  • the evaporator may selectively be coupled into the flow circuit of the freezing system allowing the refrigerant of the freezing system to flow through the evaporator cooling the surroundings to a freezing temperature, e.g. - 18 0 C, and the evaporator may selectively be coupled into the flow circuit of the chilling system allowing the refrigerant of the chilling system to flow through the evaporator cooling the surroundings to a chilling temperature, e.g. 4 0 C.
  • the evaporator may selectively cool the surroundings to a freezing temperature with the efficiency of the freezing system and cool the surroundings to a chilling temperature with the efficiency of the chilling system.
  • one of the refrigerants is input to the respective flow path at a first end of the evaporator and the other of the refrigerants is input to the other respective flow path at a second end of the evaporator opposite the first end.
  • the evaporator may comprise a plurality of cooling fins for provision of an air flow path with a large cooling area, and an array of rows and columns of tubular flow channels extending linearly through and substantially perpendicular to the cooling fins, the tubular flow channels being interconnected with U-shaped tubes at the first and second end of the evaporator to form the separate flow paths for the refrigerants of the freezing system and the chilling system.
  • the flow channels may be interconnected in such a way that every second column of flow channels form part of one of the flow paths, and every other second column of flow channels form part of the other of the flow paths.
  • One of the refrigerants may be CO 2 .
  • the freezing system and/or the chilling system may be a transcritical system, such as a transcritical CO 2 system.
  • the gas cooler or condenser may be a shared gas cooler or condenser that is shared by the freezing system and the chilling system and provides a separate flow path for each of the refrigerants of the freezing system and the chilling system through the shared condenser or gas cooler.
  • the system may comprise a shared gas cooler or condenser and separate evaporators.
  • Fig. 1 is a blocked schematic of an embodiment of a refrigeration system according to the present invention.
  • Fig. 2 shows in perspective an evaporator according to the present invention.
  • Fig. 1 is a blocked schematic of an embodiment 10 of a refrigeration system according to the present invention.
  • the system 10 comprises a freezing system 12 and a chilling system 14.
  • the freezing system 12 has a refrigerant flow circuit 16 for recirculation of a refrigerant 18, the flow circuit 16 comprising a compressor 20 for generation of a refrigerant flow in the direction of the arrow 22 from a low-pressure side to a high-pressure side of the compressor 20 and, in the order defined by the flow direction, connected in series with a condenser, or, in a transcritical system, a gas cooler 24 for cooling of the refrigerant 18 towards the ambient temperature, a receiver 26 for accommodation of the refrigerant 18.
  • the receiver 26 is connected to a magnet valve 27 in series with an expansion valve 28 that cooperates with the compressor 20 for generation of the low-pressure side and the high-pressure side of the compressor 20, and a shared evaporator 30 for evaporation of the refrigerant 18.
  • the chilling system 14 has a refrigerant flow circuit 32 for recirculation of a refrigerant 34, the flow circuit 32 comprising a compressor 36 for generation of a refrigerant flow in the direction of the arrow 38 from a low-pressure side to a high-pressure side of the compressor 36 and, in the order defined by the flow direction, connected in series with a condenser, or, in a transcritical system, a gas cooler 40 for cooling of the refrigerant 34 towards the ambient temperature, a receiver 42 for accommodation of the refrigerant 34.
  • the receiver 42 is connected to a magnet valve 43 in series with an expansion valve 44 that cooperates with the compressor 36 for generation of the low-pressure side and the high-pressure side of the compressor 36, and the evaporator 30 for evaporation of the refrigerant 34.
  • the shared evaporator 30 may selectively be coupled into the flow circuit 16 of the freezing system 12 by opening magnet valve 27 and closing magnet valve 43 thereby allowing the refrigerant 18 of the freezing system 12 to flow through the shared evaporator 30 cooling the surroundings of the shared evaporator 30 to a freezing temperature, e.g. - 18 0 C, and the shared evaporator 30 may selectively be coupled into the flow circuit 32 of the chilling system 14 by opening magnet valve 43 and closing magnet valve 27 thereby allowing the refrigerant 34 of the chilling system 14 to flow through the shared evaporator 30 cooling the surroundings of the shared evaporator 30 to a chilling temperature, e.g. 4 0 C.
  • the shared evaporator 30 may selectively cool the surroundings to a freezing temperature with the efficiency of the freezing system and cool the surroundings to a chilling temperature with the efficiency of the chilling system.
  • Fig. 2 shows in perspective a shared evaporator 50 according to the present invention.
  • a part of the evaporator 50 shown in perspective from the left and a part of the evaporator 50 shown in perspective from the right is shown side by side.
  • the left part of Fig. 2 shows the first end 52 of the evaporator 50 where the refrigerant 18 of the freezing system 12 enters into the evaporator 50 at the input of flow channel 54 and flows through the evaporator 50 and is guided into flow channel 56 through a U-shaped tube 58 at the other end 60 of the evaporator.
  • the refrigerant flows back and forth through the evaporator 50 through the column 62 of flow channels until the refrigerant 18 is guided to the next column 64 of flow channels through U-shaped tube 66, etc. Finally, the refrigerant 18 leaves the evaporator 50 at the output of flow channel 68.
  • the refrigerant 18 is CO 2 .
  • the right part of Fig. 2 shows the second end 60 of the evaporator 50 where the refrigerant 34 of the chilling system 14 enters into the evaporator 50 at the input of flow channel 70 and flows through the evaporator 50 and is guided into flow channel 72 through a U-shaped tube 74 at the first end 52 of the evaporator 50.
  • the refrigerant 34 flows back and forth through the evaporator 50 through the column 76 of flow channels until the refrigerant 34 is guided to the next column 78 of flow channels through U-shaped tube 80, etc.
  • the refrigerant 34 leaves the evaporator 50 at the output of flow channels 82, 84.
  • the refrigerant 34 is R134a.
  • the evaporator 50 also comprises a plurality of cooling fins 90, preferably made of aluminium, for provision of an airflow path with a large cooling area.
  • the evaporator according to the present invention may be manufactured substantially at the same cost as a prior art evaporator since the only difference between the evaporator according to the present invention and the prior art evaporator may reside in a different way of connecting the U-shaped tubes to the flow channels, and the inputs and outputs for the refrigerants.
  • a shared gas cooler or condenser may also be constructed as illustrated in Fig. 2.

Abstract

Refrigeration system used for both cooling and freezing food, e.g. in a supermarket, comprises a freezing system(12) and a chilling system(14) with flow circuits for recirculation of separate refrigerants, each of the flow circuits comprising a shared evaporator (30) that is shared by the freezing system and the chilling system and provides a separate flow path through the evaporator for each of the refrigerants of the freezing system and the chilling system. The evaporator may selectively be coupled into the flow circuit of the freezing system allowing the refrigerant of the freezing system to flow through the evaporator cooling the surroundings to a freezing temperature, e.g. -180C, and the evaporator may selectively be coupled into the flow circuit of the chilling system allowing the refrigerant of the chilling system to flow through the evaporator cooling the surroundings to a chilling temperature, e .g.40C . In this way, the evaporator may selectively cool the surroudings to a freezing temperature with the efficiency of the freezing system and cool the surroundings to a chilling temperature with the efficiency of the chilling system.

Description

AN EVAPORATOR IN A COOLING FURNITURE
The present invention relates to an evaporator that improves the efficiency of a cooling furniture that is used for both cooling and freezing of food, e.g. in a supermarket.
BACKGROUND OF THE INVENTION In supermarkets, hypermarkets, etc., it is often desirable that a cooling furniture for the display and handling of food is capable of operating as a freezing counter for frozen food during some time periods and as a chilling counter for chilled food during other time periods. Cooling systems for freezing and chilling, respectively, typically constitute separate systems with different refrigerants. In known systems, a cooling furniture that may operate both at a freezing temperature, e.g. - 180C, and at a chilling temperature, e.g. 40C, the evaporator of the cooling furniture is coupled to the freezing system, and the temperature control in the furniture is switched between two thermostats so that easy selection between the two desired temperatures is provided. However, during operation at a chilling temperature, the cooling furniture operates with the efficiency of the freezing system, which is considerably lower than the efficiency of the chilling system.
SUMMARY OF THE INVENTION
Thus, it is an object of the present invention to provide a cooling furniture that is adapted for operation both at a freezing temperature and at a chilling temperature with improved efficiency at the chilling temperature. According to the present invention the above-mentioned and other objects are fulfilled by a refrigeration system comprising a freezing system and a chilling system with flow circuits for recirculation of separate refrigerants, each of the flow circuits comprising a compressor for generation of a refrigerant flow from a low-pressure side to a high-pressure side of the compressor and, in the order defined by the flow direction, connected in series with a condenser for cooling of the refrigerant towards the ambient temperature, a pressure reducing device, such as a reduction valve, cooperating with the compressor for generation of the low-pressure side and the high pressure side of the compressor, and an evaporator for evaporation of the refrigerant, e.g. in a cooling furniture.
The evaporator is a shared evaporator that is shared by the freezing system and the chilling system and provides a separate flow path through the evaporator for each of the refrigerants of the freezing system and the chilling system.
The evaporator may selectively be coupled into the flow circuit of the freezing system allowing the refrigerant of the freezing system to flow through the evaporator cooling the surroundings to a freezing temperature, e.g. - 18 0C, and the evaporator may selectively be coupled into the flow circuit of the chilling system allowing the refrigerant of the chilling system to flow through the evaporator cooling the surroundings to a chilling temperature, e.g. 4 0C. In this way, the evaporator may selectively cool the surroundings to a freezing temperature with the efficiency of the freezing system and cool the surroundings to a chilling temperature with the efficiency of the chilling system.
In a preferred embodiment, one of the refrigerants is input to the respective flow path at a first end of the evaporator and the other of the refrigerants is input to the other respective flow path at a second end of the evaporator opposite the first end.
The evaporator may comprise a plurality of cooling fins for provision of an air flow path with a large cooling area, and an array of rows and columns of tubular flow channels extending linearly through and substantially perpendicular to the cooling fins, the tubular flow channels being interconnected with U-shaped tubes at the first and second end of the evaporator to form the separate flow paths for the refrigerants of the freezing system and the chilling system. The flow channels may be interconnected in such a way that every second column of flow channels form part of one of the flow paths, and every other second column of flow channels form part of the other of the flow paths.
One of the refrigerants may be CO2.
The freezing system and/or the chilling system may be a transcritical system, such as a transcritical CO2 system.
Similar to the shared evaporator, the gas cooler or condenser may be a shared gas cooler or condenser that is shared by the freezing system and the chilling system and provides a separate flow path for each of the refrigerants of the freezing system and the chilling system through the shared condenser or gas cooler. The system may comprise a shared gas cooler or condenser and separate evaporators. BRIEF DESCRIPTION OF THE DRAWINGS
Below the invention will be described in more detail with reference to the exemplary embodiments illustrated in the drawing, wherein
Fig. 1 is a blocked schematic of an embodiment of a refrigeration system according to the present invention, and
Fig. 2 shows in perspective an evaporator according to the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Fig. 1 is a blocked schematic of an embodiment 10 of a refrigeration system according to the present invention. The system 10 comprises a freezing system 12 and a chilling system 14. The freezing system 12 has a refrigerant flow circuit 16 for recirculation of a refrigerant 18, the flow circuit 16 comprising a compressor 20 for generation of a refrigerant flow in the direction of the arrow 22 from a low-pressure side to a high-pressure side of the compressor 20 and, in the order defined by the flow direction, connected in series with a condenser, or, in a transcritical system, a gas cooler 24 for cooling of the refrigerant 18 towards the ambient temperature, a receiver 26 for accommodation of the refrigerant 18. The receiver 26 is connected to a magnet valve 27 in series with an expansion valve 28 that cooperates with the compressor 20 for generation of the low-pressure side and the high-pressure side of the compressor 20, and a shared evaporator 30 for evaporation of the refrigerant 18. Likewise, the chilling system 14 has a refrigerant flow circuit 32 for recirculation of a refrigerant 34, the flow circuit 32 comprising a compressor 36 for generation of a refrigerant flow in the direction of the arrow 38 from a low-pressure side to a high-pressure side of the compressor 36 and, in the order defined by the flow direction, connected in series with a condenser, or, in a transcritical system, a gas cooler 40 for cooling of the refrigerant 34 towards the ambient temperature, a receiver 42 for accommodation of the refrigerant 34. The receiver 42 is connected to a magnet valve 43 in series with an expansion valve 44 that cooperates with the compressor 36 for generation of the low-pressure side and the high-pressure side of the compressor 36, and the evaporator 30 for evaporation of the refrigerant 34.
The shared evaporator 30 may selectively be coupled into the flow circuit 16 of the freezing system 12 by opening magnet valve 27 and closing magnet valve 43 thereby allowing the refrigerant 18 of the freezing system 12 to flow through the shared evaporator 30 cooling the surroundings of the shared evaporator 30 to a freezing temperature, e.g. - 18 0C, and the shared evaporator 30 may selectively be coupled into the flow circuit 32 of the chilling system 14 by opening magnet valve 43 and closing magnet valve 27 thereby allowing the refrigerant 34 of the chilling system 14 to flow through the shared evaporator 30 cooling the surroundings of the shared evaporator 30 to a chilling temperature, e.g. 4 0C. In this way, the shared evaporator 30 may selectively cool the surroundings to a freezing temperature with the efficiency of the freezing system and cool the surroundings to a chilling temperature with the efficiency of the chilling system.
Fig. 2 shows in perspective a shared evaporator 50 according to the present invention. For illustration purposes, a part of the evaporator 50 shown in perspective from the left and a part of the evaporator 50 shown in perspective from the right is shown side by side. The left part of Fig. 2 shows the first end 52 of the evaporator 50 where the refrigerant 18 of the freezing system 12 enters into the evaporator 50 at the input of flow channel 54 and flows through the evaporator 50 and is guided into flow channel 56 through a U-shaped tube 58 at the other end 60 of the evaporator. The refrigerant flows back and forth through the evaporator 50 through the column 62 of flow channels until the refrigerant 18 is guided to the next column 64 of flow channels through U-shaped tube 66, etc. Finally, the refrigerant 18 leaves the evaporator 50 at the output of flow channel 68. In the illustrated example, the refrigerant 18 is CO2.
Likewise, the right part of Fig. 2 shows the second end 60 of the evaporator 50 where the refrigerant 34 of the chilling system 14 enters into the evaporator 50 at the input of flow channel 70 and flows through the evaporator 50 and is guided into flow channel 72 through a U-shaped tube 74 at the first end 52 of the evaporator 50. The refrigerant 34 flows back and forth through the evaporator 50 through the column 76 of flow channels until the refrigerant 34 is guided to the next column 78 of flow channels through U-shaped tube 80, etc. Finally, the refrigerant 34 leaves the evaporator 50 at the output of flow channels 82, 84. In the illustrated example, the refrigerant 34 is R134a.
The evaporator 50 also comprises a plurality of cooling fins 90, preferably made of aluminium, for provision of an airflow path with a large cooling area.
The person skilled in the art will appreciate that the evaporator according to the present invention may be manufactured substantially at the same cost as a prior art evaporator since the only difference between the evaporator according to the present invention and the prior art evaporator may reside in a different way of connecting the U-shaped tubes to the flow channels, and the inputs and outputs for the refrigerants.
A shared gas cooler or condenser may also be constructed as illustrated in Fig. 2.

Claims

1. A refrigeration system comprising a freezing system and a chilling system with flow circuits for recirculation of separate refrigerants, each of the flow circuits comprising a compressor, a condenser or gas cooler, a pressure reducing device, and an evaporator, c h a r a c t e r i z e d in that the evaporator is a shared evaporator that is shared by the freezing system and the chilling system and provides a separate flow path for each of the refrigerants of the freezing system and the chilling system through the shared evaporator, and/or the condenser or gas cooler is a shared condenser or gas cooler that is shared by the freezing system and the chilling system and provides a separate flow path for each of the refrigerants of the freezing system and the chilling system through the shared condenser or gas cooler.
2. A system according to claim 1 , wherein the evaporator has a first end and a second end opposite the first end, and wherein one of the refrigerants is input to the respective flow path at the first end and the other of the refrigerants is input to the other respective flow path at the second end.
3. A system according to claim 1 or 2, wherein the evaporator comprises a plurality of cooling fins for provision of an air flow path with a large cooling area, and an array of rows and columns of tubular flow channels extending linearly through and substantially perpendicular to the cooling fins, the tubular flow channels being interconnected with U-shaped tubes at the first and second end of the evaporator to form the separate flow paths for the refrigerants of the freezing system and the chilling system.
4. A system according to any of the previous claims, wherein the flow channels are interconnected in such a way that every second column of flow channels form part of one of the flow paths, and every other second column of flow channels form part of the other of the flow paths.
5. A system according to any of the previous claims, wherein one of the refrigerants is CO2.
6. A system according to any of the previous claims, wherein the freezing system is a transcritical system.
7. A system according to any of the previous claims, wherein the chilling system is a transcritical system.
PCT/DK2007/000040 2006-01-27 2007-01-27 An evaporator in a cooling furniture WO2007085264A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200600126 2006-01-27
DKPA200600126 2006-01-27

Publications (2)

Publication Number Publication Date
WO2007085264A2 true WO2007085264A2 (en) 2007-08-02
WO2007085264A3 WO2007085264A3 (en) 2007-09-20

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5205130A (en) * 1991-07-02 1993-04-27 Pannell Bobby L Dual stage AC system for recreational vehicle
US20020092318A1 (en) * 2001-01-16 2002-07-18 Russ Tipton Multi-stage refrigeration system
US20020179294A1 (en) * 2001-05-31 2002-12-05 Gupte Neelkanth Shridhar Tube and shell heat exchanger for multiple circuit refrigerant system
WO2004018946A2 (en) * 2002-08-23 2004-03-04 Hebert Thomas H Integrated dual circuit evaporator
DE10316165A1 (en) * 2003-04-09 2004-10-28 Institut für Luft- und Kältetechnik gGmbH Solar compact milk refrigerating unit has energy converter and two different sized individually switchable speed-controllable coolant compressors with heat exchangers and through flow refrigerator
JP2005241090A (en) * 2004-02-25 2005-09-08 Mitsubishi Heavy Ind Ltd Combination type air conditioning equipment and its operating method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5205130A (en) * 1991-07-02 1993-04-27 Pannell Bobby L Dual stage AC system for recreational vehicle
US20020092318A1 (en) * 2001-01-16 2002-07-18 Russ Tipton Multi-stage refrigeration system
US20020179294A1 (en) * 2001-05-31 2002-12-05 Gupte Neelkanth Shridhar Tube and shell heat exchanger for multiple circuit refrigerant system
WO2004018946A2 (en) * 2002-08-23 2004-03-04 Hebert Thomas H Integrated dual circuit evaporator
DE10316165A1 (en) * 2003-04-09 2004-10-28 Institut für Luft- und Kältetechnik gGmbH Solar compact milk refrigerating unit has energy converter and two different sized individually switchable speed-controllable coolant compressors with heat exchangers and through flow refrigerator
JP2005241090A (en) * 2004-02-25 2005-09-08 Mitsubishi Heavy Ind Ltd Combination type air conditioning equipment and its operating method

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