[go: up one dir, main page]

WO2012071624A1 - Système frigorifique - Google Patents

Système frigorifique Download PDF

Info

Publication number
WO2012071624A1
WO2012071624A1 PCT/AU2011/001565 AU2011001565W WO2012071624A1 WO 2012071624 A1 WO2012071624 A1 WO 2012071624A1 AU 2011001565 W AU2011001565 W AU 2011001565W WO 2012071624 A1 WO2012071624 A1 WO 2012071624A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
main condenser
auxiliary heat
refrigeration system
condenser
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.)
Ceased
Application number
PCT/AU2011/001565
Other languages
English (en)
Inventor
Ian Wilson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STRATHBROOK INDUSTRIAL SERVICES Pty Ltd
Original Assignee
STRATHBROOK INDUSTRIAL SERVICES Pty Ltd
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
Priority claimed from AU2010905293A external-priority patent/AU2010905293A0/en
Application filed by STRATHBROOK INDUSTRIAL SERVICES Pty Ltd filed Critical STRATHBROOK INDUSTRIAL SERVICES Pty Ltd
Publication of WO2012071624A1 publication Critical patent/WO2012071624A1/fr
Priority to AU2013100212A priority Critical patent/AU2013100212B4/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary 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
    • 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
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser

Definitions

  • the present invention relates to refrigeration systems, in particular C0 2 refrigeration systems.
  • Vapour compression refrigeration systems typically include a refrigerant continuously cycled between the primary components of an evaporator, compressor, condenser and expansion valve.
  • the refrigerant collects heat from the air to be cooled. This heat exchange causes the temperature of the refrigerant in the evaporator to increase and vaporise.
  • the refrigerant is then compressed by a compressor which increases the refrigerants pressure and temperature, and the resultant hot gaseous refrigerant is then directed to a condenser where the heat can be removed by cooling the vapour.
  • heat is given up heat in the condenser via indirect heat transfer to a secondary fluid such as air, water or glycol.
  • the gaseous refrigerant thereby liquefies (condenses) and is returned, via an expansion valve, to the evaporator so the process can be continuous.
  • the type of refrigerant selected depends on the application and temperature of refrigeration required. Some examples include Carbon Dioxide, Ammonia and Freon (CFC's and HCFC's). In the past Freon was widely used, however due to its harmful effects on the environment, use of Freon in refrigeration systems is now prohibited in some countries. The current trend is towards more environmentally friendly refrigerants such as C.0 2 . C0 2 refrigeration systems are more efficient than conventional Freon refrigeration systems when the ambient temperature is low. However, as the ambient temperature rises, a significant decrease in performance is observed.
  • Carbon dioxide has a low critical temperature (the temperature above which the refrigerant will not liquefy) of 31 deg C. Some carbon dioxide systems are able to operate both above and below the critical temperature and these systems are called trans-critical systems.
  • a condenser for use in a carbon dioxide system can operate in two ways:
  • the present invention seeks to provide a refrigeration system that will prevent the loss of performance at warmer ambient temperatures whilst still permitting the system to take advantage of energy saving opportunities when lower ambient temperatures are available.
  • the present invention provides a carbon dioxide (C0 2 ) based refrigeration system including: a primary refrigeration circuit cycling C0 2 , the primary refrigeration circuit including a main condenser and an auxiliary heat exchanger, the auxiliary heat exchanger for reducing the temperature of C0 2 flowing out of the main condenser, wherein the auxiliary heat exchanger is independently operable with respect to the primary refrigeration circuit such that when the temperature of C0 2 flowing out of the main condenser is at or above a threshold temperature, the auxiliary heat exchanger operates to reduce the temperature of the C0 2 .
  • C0 2 carbon dioxide
  • the C0 2 based refrigeration system further includes a sensor for detecting the temperature of C0 2 flowing out of the main condenser, and a control unit connected to the sensor, the control unit configured to operate the auxiliary heat exchanger when the temperature of C0 2 flowing out of the main condenser is at or above the threshold temperature.
  • control unit is configured to stop operation of the auxiliary heat exchanger when the temperature of C0 2 flowing out of the main condenser below the threshold temperature.
  • auxiliary heat exchanger is connected downstream, in series with, the main condenser.
  • the auxiliary heat exchanger is connected in parallel with the main condenser.
  • a C0 2 based refrigeration system the auxiliary heat exchanger includes: an auxiliary condenser which is part of the primary refrigeration circuit such that it receives the C0 2 flowing through the circuit; and an evaporator which is part of a secondary refrigeration circuit cycling a second refrigerant, the evaporator indirectly cooling the C0 2 flowing through the auxiliary condenser.
  • the threshold temperature is such that the C0 2 flowing through the primary refrigeration circuit is prevented from becoming a super critical fluid.
  • the threshold temperature is about 31° C.
  • the threshold temperature is about 25° C.
  • the primary refrigeration circuit includes a plurality of auxiliary heat exchangers.
  • the refrigeration system includes a plurality of primary refrigeration circuits, and a plurality of auxiliary heat exchangers, any one or a combination of the plurality of auxiliary heat exchangers operating to reduce the temperature of C0 2 within any one of the plurality of primary refrigeration circuits.
  • the present invention provides a C0 2 based refrigeration system including:
  • a primary refrigeration circuit cycling C0 2 the primary refrigeration circuit including a main condenser
  • cooling assembly is operable to reduce the temperature of the main condenser.
  • the cooling assembly operates to reduce the temperature of the main condenser when the temperature of C0 2 flowing out of the main condenser reaches a threshold temperature.
  • the refrigeration system further includes a sensor for detecting the temperature of C0 2 flowing out of the main condenser, and a control unit connected to the sensor, the control unit configured to operate the cooling assembly when the temperature of C0 2 flowing out of the main condenser is at or above the threshold temperature.
  • Figure 1 illustrates a refrigeration system according to one example of the invention having "parallel" configuration.
  • Figure 2 illustrates a refrigeration system according to one example of the invention having "series" configuration.
  • Figure 3 illustrates a refrigeration system with two auxiliary heat exchangers.
  • Figure 4 illustrates a larger refrigeration system according to one example of the invention having multiple primary refrigeration loops and multiple auxiliary heat exchangers.
  • Figure 5 illustrates a larger refrigeration system according to one example of the invention having multiple primary refrigeration loops and multiple auxiliary heat exchangers.
  • Embodiments of the present invention provide a carbon dioxide (C0 2 ) based refrigeration system including a primary refrigeration circuit cycling C0 2 , the primary refrigeration circuit including a main condenser and an auxiliary heat exchanger, the auxiliary heat exchanger for reducing the temperature of C0 2 flowing out of the main condenser.
  • the auxiliary heat exchanger is independently operable with respect to the primary refrigeration circuit such that when the temperature of C0 2 flowing out of the main condenser is at or above a threshold temperature, the auxiliary heat exchanger operates to reduce the temperature of the C0 2 .
  • FIG. 1 illustrates a refrigeration system according to one embodiment of the invention.
  • the refrigeration system (1) includes a primary refrigeration circuit (2) cycling C0 2 .
  • the primary refrigeration circuit (2) includes a compressor, main condenser (4), auxiliary condenser (5), expansion valve (6) and evaporator (7).
  • a secondary refrigeration circuit (8) can operate to maintain the auxiliary condenser (5) at a temperature lower than the main condenser (4). Accordingly this auxiliary heat exchange operates to reduce the temperature of the C0 2 flowing out of the main condenser if necessary. For example, if the temperature of C0 2 leaving the main condenser is too high (above about 31°C), the C0 2 can become super critical, lessening efficiency of the compressor and overall circuit. In practice one may wish to keep the C0 2 temperature below about 25°C so as to avoid fluctuations in C0 2 density.
  • the secondary refrigeration circuit (8) is independently operable to the primary refrigeration circuit and cycles a second refrigerant (such as, for example, Ammonia or R134A). Although not all shown in the figures, the secondary refrigeration circuit would also typically also include a compressor, condenser, expansion valve and evaporator (9). It is the evaporator (9) of the secondary refrigeration circuit (8) that indirectly cools the auxiliary condenser (5) of the first refrigeration circuit (2) such that it is reduced . to a temperature lower than the main condenser (5). This allows the auxiliary condenser to further cool C0 2 leaving the main condenser.
  • a second refrigerant such as, for example, Ammonia or R134A.
  • a control unit for the refrigeration system is able to turn the secondary refrigeration circuit (8) on and off as required.
  • the primary refrigeration circuit can operate either on its own, when low temperature ambient conditions are available, or in conjunction with the secondary refrigeration circuit, when surrounding ambient temperatures are not sufficiently cool.
  • the refrigeration system may further include a sensor connected to the control unit for detecting the temperature and/or pressure of C0 2 leaving the main condenser, or the surrounding ambient temperature.
  • the control unit may be configured to operate the cooling assembly at or above a threshold C0 2 temperature or pressure, or at or above a threshold ambient temperature.
  • the control unit may also be configured to stop operation of the secondary refrigeration circuit below the threshold C0 2 temperature or pressure, or below ambient temperature.
  • the independently operable secondary refrigeration circuit (8) operates to allow the primary refrigeration circuit to operate at its most energy efficient condition when ambient temperatures are warm, by keeping the C0 2 below its super critical point. Once C0 2 reaches the super critical phase, the efficiency of the compressor is greatly reduced. When ambient temperatures are cool enough, the secondary refrigeration circuit need not be operated as the primary circuit can take advantage of all the available ambient cooling (low ambient temperatures at night or during winter months for example).
  • the auxiliary condenser (5) is arranged in parallel to the main condenser (4).
  • the first refrigerant is thereby cooled alternatively at the main condenser (4) or by heat exchange between the auxiliary condenser (5) and the evaporator (9) of the secondary refrigeration circuit (8).
  • no control valves are required to control the direction of refrigerant flow between the two condenser options. Instead the cooling will take place in which ever condenser is in operation.
  • C0 2 would be naturally drawn to the cooler condenser as a cooler condenser converts more gas to liquid and thus lowers the pressure within the condenser, ultimately drawing in more C0 2 .
  • the air cooled main condenser (4) with fans running will draw cooling air through it and perform refrigerant cooling. Should the surrounding ambient air temperature rise to a level whereby cooling provided by the main condenser is insufficient, the auxiliary condenser (5) can take over cooling. Additionally, the auxiliary condenser (5) will take over refrigerant cooling if the airs on the primary condenser (4) are stopped and the secondary refrigeration circuit (8) is activated. As the auxiliary condenser (5) is cooled by the secondary refrigeration circuit (8) rather than the ambient environment, it can achieve sufficient cooling even when ambient temperatures are too high for the main condenser to provide efficient operation.
  • the parallel arrangement is best suited to systems that have height restrictions where the primary condenser and the auxiliary condenser must be mounted at the same level.
  • Figure 2 illustrates a different configuration wherein the main condenser (4) of the first refrigeration circuit is connected in series with the auxiliary condenser (5) such that both the condensers are able to cool and condense the low stage refrigerant.
  • This "in series” configuration cools the refrigerant (e.g., carbon dioxide) in the main condenser (4) prior to entering the auxiliary condenser (5).
  • This arrangement can provide two-stage cooling and therefore may also have power absorbed by both main (4) and auxiliary condensers (5). Energy usage may need to be managed more closely to make the system run at the optimum power consumption possible.
  • a C0 2 refrigeration system in accordance with the "in series" embodiment of figure 2 series may operate as follows in under hot, cool and cold conditions:
  • a C0 2 refrigerant may de-super heat in the main condenser to a point about 2 deg C above ambient temperature, reducing the load on the auxiliary condenser, which would thereafter condense the C0 2 and sub cool it to about 15 deg C.
  • the auxiliary condenser can act as a sub-cooler, so as to improve the efficiency of the C0 2 system.
  • the refrigeration system may include a primary refrigeration loop with a plurality of auxiliary heat exchangers.
  • auxiliary heat exchanger down stream from the main condenser does not need to be facilitated by a secondary refrigeration circuit.
  • other cooling means to cool the C0 2 leaving the main condenser can be provided, such as, for example, a natural source such as river water or other water source.
  • Figure 3 illustrates an embodiment wherein a secondary refrigeration circuit provides two evaporators (36a, 36b) connected in parallel, each evaporator operating to cool a corresponding auxiliary condenser (41a, 41b) of a primary C0 2 refrigeration loop (40a, 40b).
  • the secondary refrigeration circuit of figure 3 includes an accumulator (31), compressor (30), oil separator (32), condenser (33), receiver (34) and two evaporators (36a, 36b) connected in parallel.
  • the two evaporators (36a, 36b) are arranged to interact and cool the auxiliary condensers (41a, 41b) of the two primary loops (40a, 40 b).
  • the multiple evaporator configuration of figure 3 may be used to cool a single large primary refrigeration circuit.
  • Multiple evaporators of the secondary circuit could operate to cool one or more condensers (arranged in series or otherwise) of a large primary refrigeration circuit.
  • Such a configuration would allow the heat transfer load at each heat exchange point to thereby be divided among the evaporators of the secondary circuit.
  • Some larger refrigeration systems may include multiple primary C0 2 refrigeration circuits, the respective auxiliary condensers of each primary circuit being cooled by any one or a combination of secondary refrigeration circuits or otherwise.
  • figure 4 provides a refrigeration system including two primary C0 2 refrigeration circuits (50,50a) each having respective main condensers (51, 51a).
  • Each primary refrigeration circuit has 3 auxiliary heat exchangers (52, 53, 54) (52a, 53a, 54a).
  • the auxiliary heat exchangers are connected in parallel with each other and with the main condenser.
  • Figure 5 shows a similar arrangement with two primary C0 2 refrigeration loops (60,60a) each having respective main condensers (61,61a). Each loop has 3 auxiliary heat exchangers (62, 63, 64), (62a, 63a, 64a). However, figure 5 has the auxiliary heat exchangers of the primary circuits in parallel with one another, but in series with respective main condensers.
  • the larger system configurations such as those of figures 3, 4 and 5 can provide additional protection against individual refrigeration circuit failure.
  • the main and auxiliary condensers do not necessarily need to be air cooled.
  • the cooling fluid may be anything that is cooler than the condensing temperature.
  • the main condenser could be cooled by air, water, brine or any other fluid.
  • a further embodiment does not utilise an auxiliary heat exchanger in combination with a main condenser, but rather a cooling assembly operates to cool the main condenser itself.
  • the system may have chilled water as the main condenser cooling fluid, which requires operation of a cooling assembly (chiller).
  • a cooling assembly (chiller).
  • the chiller may be shut down and the colder surrounding ambient air may be used to cool the main condenser.
  • the cooling assembly/chiller may be switched on such that chilled water is used for cooling.
  • the present invention allows the auxiliary heat exchanger to be switched on and off on demand.
  • the auxiliary heat exchanger can provide a cooling fluid that is the below the temperature of the main condenser in the primary refrigeration circuit. For example, in colder ambient temperatures the auxiliary heat exchanger may be switched off such that the main condenser is cooled by surrounding air.
  • a C0 2 refrigeration system may be installed in the vicinity of one or more separate air conditioning systems (for example such systems may provide cooling via ammonia water chillers).
  • air conditioning systems for example such systems may provide cooling via ammonia water chillers.
  • Such an arrangement is typical in a supermarket environment wherein refrigeration and air conditioning can be required simultaneously.
  • the air conditioning systems would typically be off, and the cooler ambient temperatures would allow the C0 2 system to effectively provide refrigeration.
  • the air conditioning systems would typically be running. Accordingly, if the main condenser of the refrigeration system is not sufficiently cooling the C0 2 , any excess cooling capacity could be fed off the running air conditioning systems to provide further cooling to the C0 2 . This would prevent C0 2 becoming super critical and thus avoid compressor inefficiency in the C0 2 system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

La présente invention a trait à un système frigorifique à base de dioxyde de carbone (CO2) qui inclut un circuit frigorifique primaire qui met en cycle le CO2, lequel circuit frigorifique primaire inclut un condensateur principal et un échangeur de chaleur auxiliaire. L'échangeur de chaleur auxiliaire permet de réduire la température du CO2 qui sort du condensateur principal. L'échangeur de chaleur auxiliaire fonctionne de façon indépendante par rapport au circuit frigorifique primaire de sorte que, lorsque la température du CO2 sortant du condensateur principal est supérieure ou égale à une température seuil, l'échangeur de chaleur auxiliaire fonctionne de manière à réduire la température du CO2.
PCT/AU2011/001565 2010-12-01 2011-12-01 Système frigorifique Ceased WO2012071624A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2013100212A AU2013100212B4 (en) 2010-12-01 2013-02-26 A Refrigeration System

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2010905293 2010-12-01
AU2010905293A AU2010905293A0 (en) 2010-12-01 A refrigeration system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
AU2013100212A Division AU2013100212B4 (en) 2010-12-01 2013-02-26 A Refrigeration System

Publications (1)

Publication Number Publication Date
WO2012071624A1 true WO2012071624A1 (fr) 2012-06-07

Family

ID=46171099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2011/001565 Ceased WO2012071624A1 (fr) 2010-12-01 2011-12-01 Système frigorifique

Country Status (1)

Country Link
WO (1) WO2012071624A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024259496A1 (fr) * 2023-06-21 2024-12-26 Strathbrook Refrigeration Services Pty Limited Système de réfrigération et procédé associé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11142017A (ja) * 1997-11-13 1999-05-28 Mitsubishi Electric Corp 空気調和機
WO2001090663A1 (fr) * 2000-05-26 2001-11-29 Thermal Energy Accumulator Products Pty Ltd Systeme de chauffage et refroidissement super efficace multi-usage
US6862894B1 (en) * 2004-02-04 2005-03-08 Donald R. Miles Adaptive auxiliary condensing device and method
JP2007327720A (ja) * 2006-06-09 2007-12-20 Orion Mach Co Ltd ヒートポンプの冷凍回路
JP2009257746A (ja) * 2008-03-28 2009-11-05 Fuji Koki Corp 補助冷却装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11142017A (ja) * 1997-11-13 1999-05-28 Mitsubishi Electric Corp 空気調和機
WO2001090663A1 (fr) * 2000-05-26 2001-11-29 Thermal Energy Accumulator Products Pty Ltd Systeme de chauffage et refroidissement super efficace multi-usage
US6862894B1 (en) * 2004-02-04 2005-03-08 Donald R. Miles Adaptive auxiliary condensing device and method
JP2007327720A (ja) * 2006-06-09 2007-12-20 Orion Mach Co Ltd ヒートポンプの冷凍回路
JP2009257746A (ja) * 2008-03-28 2009-11-05 Fuji Koki Corp 補助冷却装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ALBERTO CAVALLINI ET AL.: "Carbon dioxide as a natural refrigerant", INTERNATIONAL JOURNAL OF LOW CARBON TECHNOLOGIES, vol. 2, no. ISS.3, 2007, pages 225 - 249, Retrieved from the Internet <URL:http://ijlct.oxfordjournals.org/content/2/3/225.abstract> [retrieved on 20120127] *
WILLIAM C. WITTMAN ET AL.: "Refrigeration and Air Condition Technology", THOMASON DELMAR LEARNING, 2005, pages 595 - 596 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024259496A1 (fr) * 2023-06-21 2024-12-26 Strathbrook Refrigeration Services Pty Limited Système de réfrigération et procédé associé

Similar Documents

Publication Publication Date Title
CN105283719B (zh) 冷冻装置的除霜系统以及冷却单元
EP3217121B1 (fr) Unité extérieure de climatiseur d&#39;air et son procédé de commande
USRE39924E1 (en) Refrigeration system with modulated condensing loops
US10352606B2 (en) Cooling system
ES2807850T3 (es) Procedimiento de conmutación de capacidad de compresor
EP3982059A1 (fr) Système de gestion de chaleur
ES2962114T3 (es) Aparato de refrigeración
JP2009109065A (ja) 冷凍装置
JP4317793B2 (ja) 冷却システム
EP2165135B1 (fr) Système de réfrigération
DK2649387T3 (en) CYCLE FOR COOLING
JP5246891B2 (ja) ヒートポンプシステム
JP6388260B2 (ja) 冷凍装置
JP2010501826A (ja) 通信装備用冷房装置
JP2011117685A (ja) 冷凍冷蔵庫
AU2013100212A4 (en) A Refrigeration System
CA2807643C (fr) Sous-refroidissement mecanique de systemes de refrigeration r-744 transcritiques avec recuperation de chaleur et pression de tete flottante de pompe a chaleur
WO2012071624A1 (fr) Système frigorifique
KR102856686B1 (ko) 프리쿨링을 이용한 냉동싸이클
KR20140059008A (ko) 공조 냉장 복합 시스템
JP5176874B2 (ja) 冷凍装置
JP5228661B2 (ja) 冷凍装置
JP2003106686A (ja) 冷凍装置
CA2363288C (fr) Systeme frigorifique a boucles de condensation modulees
WO2024259496A1 (fr) Système de réfrigération et procédé associé

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11844062

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11844062

Country of ref document: EP

Kind code of ref document: A1