• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE0950507A1
    申请号:SE0950507
    申请日:2009-06-30
    公开日:2010-12-31
    发明作者:Rolf Christensen
    申请人:Alfa Laval Corp Ab；
    IPC主号:
    专利说明:

    With regard to the temperature difference required in a heat exchanger, ie. approximately 10 ° C, the upper limit of heat generation, based on the CO2 condensation, will have an ambient temperature of around 20 ° C. Below this temperature, CO2 stays below the critical point, which means that the cooling system is operated in a subcritical position. For refrigeration systems used in grocery stores, the ambient temperature during the summer exceeds 20 ° C in a large part of the world. At these temperatures, the CO 2 cooling constitutes a single-phase cooling, namely gas cooling. CO2 is above the critical point on the high-pressure side of the system, which means that the cooling system is operated in a transcritical position.
    The cooling system's efficiency and cooling capacity are lower in transcritical operation than in subcritical operation. It is a weakness of existing CO 2 cooling systems that they have degraded performance at elevated ambient temperatures in excess of about 20 ° C, i.e. when high performance is desired. The object of the present invention is to provide a transcritical cooling system with improved performance during transcritical operation.
    DISCLOSURE OF THE INVENTION An object of the present invention is to provide a solution to the problem of the conflicting requirements regarding the heat exchanger construction for gas coolers and condensers. Instead of developing a heat exchanger design that is adapted for subcritical conditions and then using this for transcritical operation, you can use a number of heat exchangers in a system.
    In accordance with a first aspect of the present invention, these objects are achieved by connecting at least one heat exchanger in series with the other heat exchangers in a transcritical state.
    The method includes the principle of connecting your heat exchangers in parallel during condensation and then connecting them in series or connecting them in series in parallel during transcritical operation. Preferably, the method comprises arranging an inlet and an outlet at opposite ends of the system and connecting all heat exchangers in series in a transcritical state.
    This significantly improves the efficiency in the transcritical mode because the thermal length and heat transfer increase with the consequence that the coolant outlet temperature can be lowered.
    The system is further changed from parallel connected to series-connected heat exchangers by closing a first pipeline, connecting said inlet to a first channel in each heat exchanger after the first heat exchanger and between every second subsequent heat exchanger, and a second pipeline, connecting said outlet to each second channel heat exchanger between remaining heat exchangers.
    By providing said heat exchanger with a double circuit for heat transfer between two essentially liquid-based media, e.g. a coolant and a saline solution, an advantage arises when each circuit is switched between being connected in parallel and connected in series.
    Thanks to the ibil flexibility, it becomes possible to optimize the system's performance for both subcritical and transcritical operation.
    Another aspect of the invention consists of a system of heat exchangers with an inlet and an outlet at opposite ends of the system, a first pipeline connected to said inlet and to a first channel in each heat exchanger and a second pipeline connected to said outlet and to a second duct in each heat exchanger, characterized in that a valve is located in the first pipeline after the first heat exchanger and between every other subsequent heat exchanger and the second pipeline between the remaining heat exchangers, and where the heat exchangers are connected in parallel when all valves are in open position and in series valves are in the closed position. BRIEF DESCRIPTION OF THE DRAWINGS This and other aspects of the present invention will be described in detail below with reference to the accompanying drawings, which show an adequate embodiment of the invention.
    Figure 1a shows a schematic view of a system of heat exchangers in accordance with a first parallel-connected operating state in accordance with the present invention.
    Figure 1b shows a diagram regarding temperature / position for the operating condition according to Figure 1a.
    Figure 2a shows a schematic view of a system of heat exchangers in accordance with a second series-connected operating condition in accordance with the present invention.
    Figure 2b shows a diagram regarding temperature / position for the operating condition according to Figure 2a.
    DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION Figures 1a and 2a depict a system 1 of heat exchanger 2. Each heat exchanger 2 has a double circuit for heat transfer between two substantially liquid-based media, for example a cooling medium and a saline solution. However, the present invention is also applicable to heat exchangers which use only one medium. The system 1 of heat exchanger 2 has an inlet A, e.g. from a compressor (not shown) in a refrigerant circuit, and an outlet B, e.g. an expansion valve (not shown), at opposite ends of the system 1.
    Correspondingly, the system 1 has an inlet C and an outlet D for the saline circuit at opposite ends of the system 1. The system 1 further has a first pipeline 4 connected to said inlet A and to a first channel 5 in each heat exchanger 2, and a second pipeline 6 connected to said outlet B and to a second channel 7 in each heat exchanger 2. A valve 3 is further placed in the first pipeline 4, after the first heat exchanger 2 and between every second subsequent heat exchanger 2, and in the second pipeline 6 between The remaining heat exchangers 2, where the heat exchangers 2 are connected in parallel when all valves 3 are in the open position, as shown in Figure 1a, and connected in series when all the valves 3 are in the closed position, as shown in Figure 2a. In Figure 1a, the heat exchangers 2 are connected in parallel for the subcritical state, i.e. at a temperature below the condensation point of the refrigerant. The heat transfer is depicted in Figure 1b, where the upper curve corresponds to the temperature drop of the coolant between inlet A and outlet B, where the coolant has a more or less constant temperature during condensation, and where the lower curve corresponds to the temperature increase of the saline between inlet C and outlet D. Figure 2a are the heat exchangers 2 connected in series with each other for a transcritical state, i.e. at a temperature exceeding the condensation point of the refrigerant. The heat transfer is depicted in Figure 2b, where the upper curve corresponds to the temperature drop of the refrigerant between inlet A and outlet B, and where the lower curve corresponds to the temperature increase of the saline solution between inlet C and outlet D. The heat exchangers 2 are shifted from being connected in parallel by closing valves 3 which are arranged in a first pipeline 4 connected to a first duct 5 in each heat exchanger 2 after every other heat exchanger 2, and in a second pipeline 6 connected to a second duct 7 in each heat exchanger 2 between remaining heat exchangers 2.
    The saline circuit (not shown) has a corresponding pipeline 8 and a pipeline 9, which communicate with inlet C and outlet D, respectively, and the valves 10. The saline circuit can be similarly switched between being connected in parallel and being connected in series. The valves 10 are located in the pipeline 8, after the first heat exchanger 2 and inlet C and between every other subsequent heat exchanger 2, and in the second pipeline 9 between the remaining heat exchangers 2, where the heat exchangers 2 are connected in parallel when all valves 10 are in the open position. as shown in Figure 1a, and connected in series when all valves 10 are in the closed position, as shown in Figure 2a.
    Those skilled in the art will appreciate that the present invention is in no way limited to the adequate embodiments described above. On the contrary, the situation is such that many modifications and variations are possible within the scope of the appended claims. For example, only one circuit in the dual circuit heat exchanger needs to be in operation in accordance with the present invention.
    权利要求:
    Claims (4)
    [1]
    A method of operating a system (1) of heat exchangers (2) for subcritical and transcritical states, by initially connecting at least two heat exchangers (2) for the subcritical state, can be characterized by the series connection of at least one heat exchanger (2) ) with the other heat exchangers in the transcritical state, and the arrangement of an inlet (A) and an outlet (B) at opposite ends of the system (1), and the shifting of the heat exchangers (2) from being connected in parallel to being connected in series by closing the a first pipeline (4), connecting said inlet (A) to a first channel (5) in each heat exchanger (2) after the first heat exchanger (2) and between every second subsequent heat exchanger (2), and a second pipeline (6) , connecting said outlet (B) to a second channel (7) in each heat exchanger (2) between remaining heat exchangers.
    [2]
    A method according to claim 1, which provides said heat exchanger (2) with a double circuit for heat transfer between two substantially liquid-based media, e.g. a coolant and a saline solution, characterized by the shifting of each circuit from being connected in parallel to being connected in series.
    [3]
    A method according to any one of claims 1 to 2, characterized by the serial copying of all heat exchangers (2) in a transcritical state.
    [4]
    A system (1) of heat exchanger (2) having an inlet (A) and an outlet (B) at opposite ends of the system (1), a first pipeline (4) connected to said inlet (A) and to a first channel (5) in each heat exchanger (2) and a second pipeline (6) connected to said outlet (B) and to a second channel (7) in each heat exchanger (2), characterized by a valve (3) placed in the first pipeline (4) after the first heat exchanger (2) and between each other thereafter = i fl âfzfš (ïL- * tt ~ tëí ~ -f fl seiuzvziztílšíšfätšš ~ ttTenipïrtoteséäEFtšeëêš 38912- Sš. heat exchanger (2) and in the second pipeline (6) between the remaining heat exchangers (2), where the heat exchangers (2) are connected in parallel when all valves (3) are in the open position and connected in series when all valves (3) are in the closed position .
    类似技术:
    公开号 | 公开日 | 专利标题
    CN105190197B|2018-01-09|Atmosphere control system with multiple compressors
    CN203258933U|2013-10-30|Condensing unit
    US9658005B2|2017-05-23|Heat exchanger system
    CN104842752A|2015-08-19|Vehicle cooling circuit
    EP2538146B1|2016-04-20|Cold/hot water supply apparatus
    CN101846414B|2012-08-29|Air conditioner and energy device
    SE0850102A1|2010-05-27|Method and system for overcooling the coolant in a vehicle's cooling system.
    KR20140090792A|2014-07-18|Alternation heat exchanger type hot gas defrosting heat-pump
    SE0950507A1|2010-12-31|Method for operating a system of heat exchangers for subcritical and transcritical states, as well as a system of heat exchangers
    CN104564352A|2015-04-29|Gas turbine with flexible air cooling system and method for operating gas turbine
    JP6000053B2|2016-09-28|Air conditioner
    EP2848875B1|2018-03-21|Hot-water supply system and control method for the same
    EP2461109B1|2017-03-01|Cold/hot water supply apparatus
    CN103017389B|2015-09-09|High-precision temperature control type heat exchange system
    EP3066313B1|2017-12-20|Method for operating an internal combustion engine
    JP2011145011A|2011-07-28|Air conditioning device
    JP2017523372A|2017-08-17|A cold / high temperature production facility that includes simultaneous air-cooling and water-cooling means, and a process for implementing the cold / high temperature production facility
    KR20110073707A|2011-06-30|Method for searching pipes in the air conditioner
    JP2009217651A|2009-09-24|Cooling/heating apparatus of vending machine
    SE523716C2|2004-05-11|Air conditioning
    CN205747568U|2016-11-30|Superposition type CO with cross valve commutation defrosting2heat pump
    JP6577384B2|2019-09-18|Compressed air storage generator
    JP2012241984A|2012-12-10|Geothermal heat pump device
    JP6143682B2|2017-06-07|Combined heat source heat pump device
    KR101558242B1|2015-10-15|Sea water heat pump system using control of intaking sea water volume
    同族专利:
    公开号 | 公开日
    WO2011002401A2|2011-01-06|
    WO2011002401A3|2011-06-09|
    CA2765853A1|2011-01-06|
    EP2449330A2|2012-05-09|
    SE533859C2|2011-02-08|
    JP2012532303A|2012-12-13|
    RU2012103008A|2013-08-10|
    US20120132399A1|2012-05-31|
    KR20120036899A|2012-04-18|
    CN102472588A|2012-05-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH10170081A|1996-12-11|1998-06-26|Toshiba Corp|Air conditioner|
    JPH10267494A|1997-03-25|1998-10-09|Mitsubishi Electric Corp|Cooler|
    JP2006097978A|2004-09-29|2006-04-13|Denso Corp|Refrigerating cycle|
    US7908881B2|2005-03-14|2011-03-22|York International Corporation|HVAC system with powered subcooler|
    KR100865093B1|2007-07-23|2008-10-24|엘지전자 주식회사|Air conditioning system|WO2013160929A1|2012-04-23|2013-10-31|三菱電機株式会社|Refrigeration cycle system|
    CN107631512A|2017-09-04|2018-01-26|广东美的暖通设备有限公司|Multiple on-line system|
    CN111336707B|2020-02-29|2021-09-03|同济大学|Carbon dioxide heat pump heating system with topologic homoembryo circulation|
    法律状态:
    2014-03-04| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950507A|SE533859C2|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|SE0950507A| SE533859C2|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|
    JP2012517456A| JP2012532303A|2009-06-30|2010-06-23|Method of operating a heat exchanger assembly during subcritical and transcritical states, and heat exchanger assembly|
    US13/380,678| US20120132399A1|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|
    CA2765853A| CA2765853A1|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|
    EP10766360A| EP2449330A2|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|
    CN2010800301916A| CN102472588A|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|
    KR1020117031414A| KR20120036899A|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|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|
    PCT/SE2010/050717| WO2011002401A2|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|
    [返回顶部]