WO2011002401A2 - Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers - Google Patents
Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers Download PDFInfo
- Publication number
- WO2011002401A2 WO2011002401A2 PCT/SE2010/050717 SE2010050717W WO2011002401A2 WO 2011002401 A2 WO2011002401 A2 WO 2011002401A2 SE 2010050717 W SE2010050717 W SE 2010050717W WO 2011002401 A2 WO2011002401 A2 WO 2011002401A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat exchangers
- assembly
- heat exchanger
- conduit
- heat
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
-
- 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
- F25B6/02—Compression machines, plants or systems, with several condenser circuits 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
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/18—Optimization, e.g. high integration of refrigeration components
Definitions
- the present invention relates to a method of operating an assembly of heat exchangers for subchtical and transcritical conditions, by initially arranging at least two heat exchangers in parallel for the subchtical condition, and to an assembly of heat exchangers.
- heat release from the refrigerant is based on condensation of the refrigerant.
- the temperature is a critical point, which being constant during condensation.
- Operating an assembly of heat exchangers below the critical point is defined as subcritical mode. It is previously known to arrange heat exchangers in parallel at such subcritical mode.
- the upper limit for heat release based on condensation of CO2 will be around 20 0 C ambient temperature. Below this temperature, the CO2 stays below the critical point and the refrigeration system operates in subchtical mode. For refrigeration systems used in supermarkets, the ambient temperature will exceed 20 0 C during the summer in a large part of the world. At these temperatures, cooling of the CO2 is a single-phase cooling, namely a gas cooling. CO2 is above the critical point at the high pressure side of the system, and the refrigeration system operates in transchtical mode.
- these objects are achieved by arranging at least one heat exchanger at a transcritical condition in series with the other heat exchangers, and arranging an inlet and an outlet at opposite ends of the assembly, and switching the heat exchangers between being arranged in parallel to being arranged in series by closing a first conduit, connecting said inlet to a first duct of each heat exchanger, after the first heat exchanger and between every second heat exchanger, and a second conduit, connecting said outlet to a second duct of each heat exchanger, between the other heat exchangers.
- the method include the use of multiple heat exchangers in parallel during condensation and then change to use them in serial or a combination serial and parallel during transcritical operation.
- Another aspect of the invention is an assembly of heat exchangers having an inlet and an outlet at opposite ends of the assembly, a first conduit connected to said inlet and to a first duct of each heat exchanger and a second conduit connected to said outlet and a second duct of each heat exchanger, characterised in that a valve being located in the first conduit after the first heat exchanger and between every second heat exchanger and in the second conduit between the other heat exchangers, wherein the heat exchangers being arranged in parallel having all valves in open position and in series having all valves in closed position.
- Figure 1 a shows a schematically view of an assembly of heat exchangers according to a first parallel arranged operating condition according to the present invention.
- Figure 1 b shows a temperature/position chart for the operating condition according to figure 1 a.
- Figure 2a shows a schematically view of the assembly of heat exchangers according to a second serial arranged operating condition according to the present invention.
- Figure 2b shows a temperature/position chart for the operating condition according to figure 2a.
- FIG 1 a and 2a shows an assembly 1 of heat exchangers 2.
- the heat exchangers 2 each have a dual-circuit for heat transfer between two essential liquid media, such as a refrigerant and brine.
- the present invention is also applicable in heat exchangers with only one liquid media.
- the assembly 1 of heat exchangers 2 having an inlet A, e.g. from a compressor (not shown) in a refrigerant circuit, and an outlet B, e.g. to an expansion valve (not shown), at opposite ends of the assembly 1.
- the assembly 1 having a corresponding inlet C and outlet D for the brine circuit at opposite ends of the assembly 1.
- the assembly 1 having a first conduit 4 connected to said inlet A and to a first duct 5 of each heat exchanger 2, and a second conduit 6 connected to said outlet B and a second duct 7 of each heat exchanger 2.
- a valve 3 being located in the first conduit 4, after the first heat exchanger 2 and between every second heat exchanger 2, and in the second conduit 6 between the other heat exchangers 2, wherein the heat exchangers 2 being arranged in parallel having all valves 3 in open position, as shown in figure 1 a, and in series having all valves 3 in closed position, as shown in figure 2a.
- the heat exchangers 2 are arranged in parallel for the subchtical condition, i.e.
- the heat transfer is shown in figure 1 b, wherein the upper curve corresponds to the temperature drop from inlet A to outlet B of the refrigerant, which during condensation having a more or less constant temperature, and the lower curve corresponds to the temperature rise from inlet C to outlet D of the brine.
- the heat exchangers 2 are arranged in series with each other at a transcritical condition, i.e. at a temperature above condensing condition of the refrigerant.
- the heat transfer is shown in figure 2b, wherein the upper curve corresponds to the temperature drop from inlet A to outlet B of the refrigerant, and the lower curve corresponds to the temperature rise from inlet C to outlet D of the brine.
- the heat exchangers 2 are switched between being arranged in parallel to being arranged in series by closing valves 3 arranged alternating in a first conduit 4, connected to a first duct 5 of each heat exchanger 2, between each second heat exchanger and in a second conduit 6, connected to a second duct 7 of each heat exchanger 2, between the other heat exchangers 2.
- the brine circuit (not shown) having a corresponding conduit 8 and a conduit 9, communicating with the inlet C and the outlet D, respectively, and valves 10.
- the brine circuit may likewise be switched between being arranged in parallel to being arranged in series.
- the valves 10 being located in the conduit 8, after the first heat exchanger 2 referred to the inlet C and between every second heat exchanger 2, and in the second conduit 9 between the other heat exchangers 2, wherein the heat exchangers 2 being arranged in parallel having all valves 10 in open position, as shown in figure 1 a, and in series having all valves 10 in closed position, as shown in figure 2a.
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)
- Other Air-Conditioning Systems (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- External Artificial Organs (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2765853A CA2765853A1 (en) | 2009-06-30 | 2010-06-23 | Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers |
US13/380,678 US20120132399A1 (en) | 2009-06-30 | 2010-06-23 | Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers |
RU2012103008/06A RU2012103008A (en) | 2009-06-30 | 2010-06-23 | METHOD OF OPERATION OF THE HEAT EXCHANGER UNIT FOR PRE-CRITICAL AND TRANSCRITICAL STATE AND THE HEAT EXCHANGER UNIT |
EP10766360A EP2449330A2 (en) | 2009-06-30 | 2010-06-23 | Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers |
JP2012517456A JP2012532303A (en) | 2009-06-30 | 2010-06-23 | Method of operating a heat exchanger assembly during subcritical and transcritical states, and heat exchanger assembly |
CN2010800301916A CN102472588A (en) | 2009-06-30 | 2010-06-23 | Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0950507A SE533859C2 (en) | 2009-06-30 | 2009-06-30 | Method for operating a system of heat exchangers for subcritical and transcritical states, as well as a system of heat exchangers |
SE0950507-4 | 2009-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2011002401A2 true WO2011002401A2 (en) | 2011-01-06 |
WO2011002401A3 WO2011002401A3 (en) | 2011-06-09 |
Family
ID=43411645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2010/050717 WO2011002401A2 (en) | 2009-06-30 | 2010-06-23 | Method of operating an assembly of heat exchangers for subcritical and transcritical conditions, and an assembly of heat exchangers |
Country Status (9)
Country | Link |
---|---|
US (1) | US20120132399A1 (en) |
EP (1) | EP2449330A2 (en) |
JP (1) | JP2012532303A (en) |
KR (1) | KR20120036899A (en) |
CN (1) | CN102472588A (en) |
CA (1) | CA2765853A1 (en) |
RU (1) | RU2012103008A (en) |
SE (1) | SE533859C2 (en) |
WO (1) | WO2011002401A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013160929A1 (en) * | 2012-04-23 | 2013-10-31 | 三菱電機株式会社 | Refrigeration cycle system |
CN107631512A (en) * | 2017-09-04 | 2018-01-26 | 广东美的暖通设备有限公司 | Multiple on-line system |
CN111336707B (en) * | 2020-02-29 | 2021-09-03 | 同济大学 | Carbon dioxide heat pump heating system with topologic homoembryo circulation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10170081A (en) * | 1996-12-11 | 1998-06-26 | Toshiba Corp | Air conditioner |
JPH10267494A (en) * | 1997-03-25 | 1998-10-09 | Mitsubishi Electric Corp | Cooler |
JP2006097978A (en) * | 2004-09-29 | 2006-04-13 | Denso Corp | Refrigerating cycle |
EP1859208A1 (en) * | 2005-03-14 | 2007-11-28 | York International Corporation | Hvac system with powered subcooler |
KR100865093B1 (en) * | 2007-07-23 | 2008-10-24 | 엘지전자 주식회사 | Air conditioning system |
-
2009
- 2009-06-30 SE SE0950507A patent/SE533859C2/en not_active IP Right Cessation
-
2010
- 2010-06-23 KR KR1020117031414A patent/KR20120036899A/en not_active Application Discontinuation
- 2010-06-23 WO PCT/SE2010/050717 patent/WO2011002401A2/en active Application Filing
- 2010-06-23 RU RU2012103008/06A patent/RU2012103008A/en not_active Application Discontinuation
- 2010-06-23 US US13/380,678 patent/US20120132399A1/en not_active Abandoned
- 2010-06-23 CA CA2765853A patent/CA2765853A1/en not_active Abandoned
- 2010-06-23 JP JP2012517456A patent/JP2012532303A/en active Pending
- 2010-06-23 EP EP10766360A patent/EP2449330A2/en not_active Withdrawn
- 2010-06-23 CN CN2010800301916A patent/CN102472588A/en active Pending
Non-Patent Citations (1)
Title |
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None |
Also Published As
Publication number | Publication date |
---|---|
RU2012103008A (en) | 2013-08-10 |
WO2011002401A3 (en) | 2011-06-09 |
EP2449330A2 (en) | 2012-05-09 |
SE533859C2 (en) | 2011-02-08 |
US20120132399A1 (en) | 2012-05-31 |
CN102472588A (en) | 2012-05-23 |
SE0950507A1 (en) | 2010-12-31 |
JP2012532303A (en) | 2012-12-13 |
KR20120036899A (en) | 2012-04-18 |
CA2765853A1 (en) | 2011-01-06 |
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