US20080282718A1 - Method and Apparatus of Optimizing the Cooling Load of an Economized Vapor Compression System - Google Patents

Method and Apparatus of Optimizing the Cooling Load of an Economized Vapor Compression System Download PDF

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Publication number
US20080282718A1
US20080282718A1 US12/090,411 US9041108A US2008282718A1 US 20080282718 A1 US20080282718 A1 US 20080282718A1 US 9041108 A US9041108 A US 9041108A US 2008282718 A1 US2008282718 A1 US 2008282718A1
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United States
Prior art keywords
refrigerant
air temperature
single stage
stage compressor
heat
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.)
Abandoned
Application number
US12/090,411
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English (en)
Inventor
Wayne P. Beagle
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Carrier Corp
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Carrier Corp
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Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BEAGLE, WAYNE P.
Publication of US20080282718A1 publication Critical patent/US20080282718A1/en
Abandoned legal-status Critical Current

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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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B2400/13—Economisers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates generally to a method of optimizing the cooling load of an economized vapor compression system by varying a speed of a single stage compressor.
  • a vapor compression system includes a compressor, a heat rejecting heat exchanger, an expansion device, and a heat accepting heat exchanger.
  • Refrigerant circulates though the closed circuit system.
  • the refrigerant exits the compressor through a discharge port at a high pressure and a high enthalpy.
  • the refrigerant then flows through the heat rejecting heat exchanger at a high pressure and rejects heat to an external fluid medium.
  • the refrigerant then flows through the expansion device, which expands the refrigerant to a low pressure. After expansion, the refrigerant flows through the heat accepting heat exchanger and absorbs heat from an air stream to cool a refrigerated container.
  • the refrigerant then re-enters the compressor through a suction port, completing the cycle.
  • An economized cycle is commonly used to enhance performance and increase both capacity and efficiency of the vapor compression system.
  • the refrigerant is split into two flow paths after exiting the heat rejecting heat exchanger.
  • the refrigerant in an economizer flow path is expanded to an intermediate pressure and exchanges heat with the refrigerant in a main flow path in an economizer heat exchanger.
  • the refrigerant in the economizer flow path is injected into an economizer port of the compressor.
  • the refrigerant in the main flow path is expanded in the expansion device.
  • Prior vapor compression systems employ a fixed speed multi-stage reciprocating compressor including at least two compression stages. Refrigerant is compressed in a first stage. The refrigerant in the economizer flow path is injected at an intermediate pressure between the first stage and a second stage. The refrigerant is then compressed in the second stage.
  • a drawback to employing a multi-stage compressor is that it is expensive. Additionally, multi-stage compressors do not perform as well as single stage compressors in certain operating conditions. Finally, as the speed of the multi-stage compressor is fixed, the compressor is unable to be controlled to match the load requirements of the vapor compression system.
  • a vapor compression system includes a single stage compressor, a heat rejecting heat exchanger, an expansion device, and a heat accepting heat exchanger.
  • Refrigerant circulates though the closed circuit vapor compression system.
  • the refrigerant is compressed in the compressor and exits the compressor through a suction port.
  • the refrigerant then enters the heat rejecting heat exchanger, such as a condenser or gas cooler, and rejects heat to an external fluid medium.
  • the refrigerant then splits into a main flow path and an economizer flow path.
  • Refrigerant in the economizer flow path is expanded to an intermediate pressure in an economizer expansion device and exchanges heat with the refrigerant in the main flow path in an economizer heat exchanger.
  • the refrigerant in the economizer flow path is returned to the compressor through an economizer port.
  • the refrigerant in the main flow path is expanded by the expansion device. After expansion, the refrigerant flows through the heat accepting heat exchanger and accepts heat from an air stream to cool a refrigerated container. The refrigerant then re-enters the compressor through a suction port, completing the cycle.
  • the speed of the compressor is varied to match the cooling load requirements of the vapor compression system.
  • the compressor includes a motor that operates the compressor at a variable speed. By adjusting the speed of the compressor, the mass flow rate of the refrigerant through the vapor compression system can be controlled to efficiently cool the refrigerated container. Increasing the speed of the compressor increases the mass flow rate of the refrigerant and the capacity of the heat accepting heat exchanger to cool the refrigerated container. Decreasing the speed of the compressor decreases the mass flow rate of the refrigerant and the capacity of the heat accepting heat exchanger to cool the refrigerated container.
  • the vapor compression system includes an air temperature sensor that measures an air temperature in the refrigerated container.
  • a desired set point temperature is programmed into a microcontroller.
  • the microcontroller increases the speed of the compressor to increase the mass flow rate of the refrigerant and therefore the cooling capacity of the vapor compression system.
  • the microcontroller When the air temperature sensor detects that the air temperature is within a predetermined range from the set point temperature, the microcontroller sends a signal to slightly decrease the speed of the compressor. This allows for fine adjustment of the cooling capacity of the vapor compression system to prevent overcooling of the refrigerated container. Once the air temperature sensor detects that the air temperature equals the set point temperature, the microcontroller sends a signal to slow down the motor of the compressor to maintain the set point temperature and match the cooling load of the vapor compression system.
  • FIG. 1 schematically illustrates an economized vapor compression system of the present invention employing a variable speed single stage compressor
  • FIG. 2A schematically illustrates the compressor when refrigerant enters a compression chamber through a suction port
  • FIG. 2B schematically illustrates the compressor when refrigerant enters the compression chamber through an economizer port
  • FIG. 2C schematically illustrates the compressor when compressed refrigerant exits the compression chamber through a discharge port.
  • FIG. 1 illustrates an example vapor compression system 20 including a single stage compressor 22 , a heat rejecting heat exchanger 24 , an expansion device 26 , and a heat accepting heat exchanger 28 .
  • Refrigerant circulates though the closed circuit vapor compression system 20 .
  • the refrigerant exits the compressor 22 through a discharge port 30 at a high pressure and a high enthalpy.
  • the refrigerant then flows through the heat rejecting heat exchanger 24 , such as a condenser or gas cooler.
  • An external fluid medium 32 such as water or air, flows through the heat rejecting heat exchanger 24 and exchanges heat with the refrigerant flowing through the heat rejecting heat exchanger 24 .
  • the refrigerant rejects heat to the external fluid medium 32 and exits the heat rejecting heat exchanger 24 at a relatively low enthalpy and a high pressure.
  • the refrigerant then splits into a main flow path 34 and an economizer flow path 36 .
  • Refrigerant in the economizer flow path 36 is expanded to an intermediate pressure in an economizer expansion device 38 and exchanges heat with the refrigerant in the main flow path 34 in an economizer heat exchanger 40 , cooling the refrigerant in the main flow path 34 .
  • the refrigerant in the economizer flow path 36 flows along an economizer return path 42 and is injected into an economizer port 44 of the compressor 22 at an intermediate pressure between a suction pressure and a discharge pressure.
  • the refrigerant in the main flow path 34 is expanded by the expansion device 26 , reducing the pressure of the refrigerant.
  • the expansion device 26 can be a mechanical expansion device (TXV), an electronic expansion valve (EXV) or other type of known expansion device.
  • the refrigerant flows through the heat accepting heat exchanger 28 and absorbs heat from an external air stream 46 to cool a space inside a refrigerated container 48 .
  • the refrigerated container 48 is used for shipping or transporting items which need to be cooled.
  • the refrigerated container 48 can be a cargo space or trailer of a vehicle, such as a truck.
  • the refrigerant exits the heat accepting heat exchanger 28 at a relatively high enthalpy and a low pressure.
  • the refrigerant then enters a suction port 50 of the compressor 22 , completing the cycle.
  • the compressor 22 is a single stage compressor that includes at least one compression chamber 52 .
  • the compressor 22 can include a single compression chamber or multiple compression chambers.
  • a suction stroke of the compressor 22 the refrigerant from the heat accepting heat exchanger 28 enters the compressor chamber 52 through the suction port 50 at the suction pressure.
  • a suction valve 54 allows the refrigerant to enter the compression chamber 52 .
  • a piston 56 blocks the economizer port 44 and prevents the refrigerant in the economizer return path 42 from entering the compression chamber 52 through the economizer port 44 .
  • a seal 64 between the piston 56 and the walls of the compression chamber 52 prevents refrigerant from flowing around the piston 56 .
  • the piston 56 moves in direction A away from the suction port 50 , enlarging the compression chamber 52 to the position shown in FIG. 2B .
  • the piston 56 no longer blocks the economizer port 44 , allowing the refrigerant in the economizer return path 42 to enter the compressor chamber 52 through the economizer port 44 .
  • the intermediate pressure of the refrigerant entering the compression chamber 52 through the economizer port 44 causes the suction valve 54 to cover the suction port 50 , preventing the refrigerant from the heat accepting heat exchanger 28 from entering the compression chamber 52 through the suction port 50 .
  • the piston 56 moves in direction B opposite to the direction A, compressing the refrigerant to the higher discharge pressure.
  • the piston 56 blocks the economizer port 44 and prevents the refrigerant in the economizer return path 42 from entering the compression chamber 52 through the economizer port 44 .
  • the increase in pressure of the refrigerant opens a discharge valve 66 , allowing the refrigerant to exit the compression chamber 52 through the discharge port 30 and flow to the heat rejecting heat exchanger 24 .
  • the speed of the compressor 22 is varied to match the cooling load requirements of the vapor compression system 20 .
  • the compressor 22 includes a motor 60 that operates the compressor 22 at variable speeds. Preferably, the compressor 22 operates at at least two speeds.
  • the mass flow rate of the refrigerant flowing through the vapor compression system 20 can be changed. Controlling the mass flow rate of the refrigerant through the vapor compression system 20 allows the load requirements of the vapor compression system 20 to be efficiently matched to optimally cool the refrigerated container 48 . That is, by controlling the speed of the compressor 22 , the load requirements of the vapor compression system 20 can be matched to optimally cool the refrigerated container 48 .
  • Increasing the speed of the compressor 22 increases the mass flow rate of the refrigerant and the capacity of the heat accepting heat exchanger 28 to cool the refrigerated container 48 . Decreasing the speed of the compressor 22 decreases the mass flow rate of the refrigerant and the capacity of the heat accepting heat exchanger 28 to cool the refrigerated container 48 .
  • the vapor compression system 20 includes an air temperature sensor 58 that measures an air temperature representative of an air temperature in the refrigerated container 48 .
  • the temperature sensor 58 measures the air temperature of the air drawn from the refrigerated container 48 .
  • the air temperature sensor 58 communicates with a microcontroller 62 .
  • a desired set point temperature of the air in the refrigerated container 48 is programmed into the microcontroller 62 .
  • the microcontroller 62 When the air temperature sensor 58 detects that the air temperature is above a threshold temperature, the microcontroller 62 increases the speed of the compressor 22 to increase the mass flow rate of the refrigerant and therefore the cooling capacity of the vapor compression system 20 .
  • the microcontroller 62 runs an algorithm to determine the speed of the compressor 22 that matches the cooling load requirements of the vapor compression system 20 .
  • the microcontroller 62 slightly decreases the speed of the compressor 22 . This reduces the mass flow rate of the refrigerant and the cooling capacity of the vapor compression system 20 , allowing for fine adjustment of the cooling capacity of the vapor compression system 20 to prevent overcooling of the refrigerated container 48 .
  • the microcontroller 62 sends a signal to slow down the motor 60 of the compressor 22 to reduce the mass flow rate of the refrigerant through the vapor compression system 20 .
  • Fine adjustment of the cooling capacity of the vapor compression system 20 prevents overcooling of the refrigerated container 48 that would make the vapor compression system 20 inefficient.
  • the heat accepting heat exchanger 28 continues to cool the refrigerated container 48 for a short period of time. If the compressor 22 continued to operate at the current speed with the current cooling capacity until the set point temperature was detected by the air temperature sensor 58 , the heat accepting heat exchanger 28 would continue to cool the refrigerated container 48 , and the temperature of the air in the refrigerated container 48 would drop below the set point temperature. This overcooling would make the vapor compression system 20 inefficient.
  • the compressor 22 can be unloaded in other ways, and one skilled in the art would know how to unload the compressor 22 .
  • the set point temperature is 0° F. and the predetermined range is 10° F.
  • the microcontroller 62 increases the speed of the compressor 22 to increase the mass flow rate of the refrigerant and the cooling capacity of the vapor compression system 20 .
  • the microcontroller 62 decreases the speed of the compressor 22 and therefore the amount of cooling provided by the heat accepting heat exchanger 28 .
  • the microcontroller 62 sends a signal to slow down the motor 60 of the compressor 22 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US12/090,411 2005-12-01 2005-12-01 Method and Apparatus of Optimizing the Cooling Load of an Economized Vapor Compression System Abandoned US20080282718A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/043368 WO2007064321A1 (fr) 2005-12-01 2005-12-01 Procede d'optimisation de la charge de refroidissement d'un systeme a compression de vapeur a economie en faisant varier la vitesse d'un compresseur mono-etage

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US20080282718A1 true US20080282718A1 (en) 2008-11-20

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US (1) US20080282718A1 (fr)
EP (1) EP1954992B1 (fr)
CN (1) CN101321996A (fr)
DK (1) DK1954992T3 (fr)
WO (1) WO2007064321A1 (fr)

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US20150059380A1 (en) * 2012-03-27 2015-03-05 Mitsubishi Electric Corporation Air-conditioning apparatus
US9835360B2 (en) 2009-09-30 2017-12-05 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
US10119738B2 (en) 2014-09-26 2018-11-06 Waterfurnace International Inc. Air conditioning system with vapor injection compressor
US10866002B2 (en) 2016-11-09 2020-12-15 Climate Master, Inc. Hybrid heat pump with improved dehumidification
US10871314B2 (en) 2016-07-08 2020-12-22 Climate Master, Inc. Heat pump and water heater
US10935260B2 (en) 2017-12-12 2021-03-02 Climate Master, Inc. Heat pump with dehumidification
US11506430B2 (en) 2019-07-15 2022-11-22 Climate Master, Inc. Air conditioning system with capacity control and controlled hot water generation
US11592215B2 (en) 2018-08-29 2023-02-28 Waterfurnace International, Inc. Integrated demand water heating using a capacity modulated heat pump with desuperheater

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US7368523B2 (en) 2004-11-12 2008-05-06 Eastman Chemical Company Polyester polymer and copolymer compositions containing titanium nitride particles
US9134053B2 (en) * 2011-08-23 2015-09-15 B/E Aerospace, Inc. Vehicle refrigerator having a liquid line subcooled vapor cycle system
US20140250925A1 (en) * 2013-03-06 2014-09-11 Esco Technologies (Asia) Pte Ltd Predictive Failure Algorithm For Refrigeration Systems
RU2690543C2 (ru) * 2014-12-11 2019-06-04 АНГЕЛАНТОНИ ТЕСТ ТЕКНОЛОДЖИЗ С.Р.Л., сокращённо АТТ С.Р.Л. Поршневой компрессор для охлаждающего устройства
EP3230587B1 (fr) 2014-12-11 2021-10-06 Angelantoni Test Technologies S.R.L., in short ATT S.R.L. Compresseur alternatif pour un dispositif de refroidissement
US10145587B2 (en) 2014-12-11 2018-12-04 Angelantoni Test Technologies S.R.L. Refrigeration device
US11629894B2 (en) * 2020-01-10 2023-04-18 Johnson Controls Tyco IP Holdings LLP Economizer control systems and methods
CN116163921A (zh) * 2022-02-18 2023-05-26 安徽美芝制冷设备有限公司 压缩机和制冷设备

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Cited By (18)

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Publication number Priority date Publication date Assignee Title
US9835360B2 (en) 2009-09-30 2017-12-05 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
US10072876B2 (en) 2009-09-30 2018-09-11 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
US10816243B2 (en) 2009-09-30 2020-10-27 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
US10845097B2 (en) 2009-09-30 2020-11-24 Thermo Fisher Scientific (Asheville) Llc Refrigeration system having a variable speed compressor
US20150059380A1 (en) * 2012-03-27 2015-03-05 Mitsubishi Electric Corporation Air-conditioning apparatus
US9683768B2 (en) * 2012-03-27 2017-06-20 Mitsubishi Electric Corporation Air-conditioning apparatus
US10119738B2 (en) 2014-09-26 2018-11-06 Waterfurnace International Inc. Air conditioning system with vapor injection compressor
US10753661B2 (en) 2014-09-26 2020-08-25 Waterfurnace International, Inc. Air conditioning system with vapor injection compressor
US11927377B2 (en) 2014-09-26 2024-03-12 Waterfurnace International, Inc. Air conditioning system with vapor injection compressor
US11480372B2 (en) 2014-09-26 2022-10-25 Waterfurnace International Inc. Air conditioning system with vapor injection compressor
US11448430B2 (en) 2016-07-08 2022-09-20 Climate Master, Inc. Heat pump and water heater
US10871314B2 (en) 2016-07-08 2020-12-22 Climate Master, Inc. Heat pump and water heater
US11435095B2 (en) 2016-11-09 2022-09-06 Climate Master, Inc. Hybrid heat pump with improved dehumidification
US10866002B2 (en) 2016-11-09 2020-12-15 Climate Master, Inc. Hybrid heat pump with improved dehumidification
US10935260B2 (en) 2017-12-12 2021-03-02 Climate Master, Inc. Heat pump with dehumidification
US11592215B2 (en) 2018-08-29 2023-02-28 Waterfurnace International, Inc. Integrated demand water heating using a capacity modulated heat pump with desuperheater
US11953239B2 (en) 2018-08-29 2024-04-09 Waterfurnace International, Inc. Integrated demand water heating using a capacity modulated heat pump with desuperheater
US11506430B2 (en) 2019-07-15 2022-11-22 Climate Master, Inc. Air conditioning system with capacity control and controlled hot water generation

Also Published As

Publication number Publication date
WO2007064321A1 (fr) 2007-06-07
EP1954992A1 (fr) 2008-08-13
DK1954992T3 (en) 2018-03-12
EP1954992A4 (fr) 2011-01-26
CN101321996A (zh) 2008-12-10
EP1954992B1 (fr) 2018-02-07

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