Of Expansion Zone Patents (Class 62/197)
  • Patent number: 10816249
    Abstract: Provided are a method and apparatus for controlling the operation of a compressor of an HVAC system in response to the refrigerant super heat value for refrigerant within the compressor. First and second signals are received for indicating one or more temperature values of refrigerant substantially at the first compressor sump and within the first distributor tube, respectively. A saturated suction temperature is estimated using at least the second signal. A first super heat value is calculated for refrigerant substantially at the first compressor sump using at least the saturated suction temperature and the one or more temperature values indicated by the first signal. A first control signal is generated for at least de-energizing the first compressor if the calculated first super heat value is below a tolerance value defining the minimum super heat value at which the first compressor may be operated.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: October 27, 2020
    Assignee: Lennox Industries Inc.
    Inventor: Rakesh Goel
  • Patent number: 10533553
    Abstract: A single-stage compressor including one compressing unit, includes: a housing having a compressing chamber formed therein and including a suction port, which is located in one side of the compressing chamber and into which a working fluid enters, and an injection port, which is located on the compressing chamber to be spaced apart from the suction port by a predetermined distance and into which an intermediate-pressure working fluid is injected; and an intermediate-pressure valve installed on an intermediate-pressure fluid flow path on which the intermediate-pressure working fluid moves and configured to control supply of the intermediate-pressure working fluid so that the intermediate-pressure working fluid is supplied to the injection port in response to an intermediate pressure of the compressing chamber.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: January 14, 2020
    Assignee: KOREA INSTITUTE OF ENERGY RESEARCH
    Inventors: Gil Bong Lee, Young Soo Lee, Beom Joon Lee, Ho Sang Ra, Young Jin Baik, Jun Hyun Cho, Hyung Ki Shin
  • Patent number: 10393417
    Abstract: A heat pump unit control system, comprising a heat exchanger, a compressor, a first switching element, a second switching element, an enhanced vapor injection electronic expansion valve, and a main circuit electronic expansion valve. A first end of the compressor is connected to a first port of the heat exchanger by the first switching element and the enhanced vapor injection valve, a second port of the heat exchanger is connected to an injection end of the compressor, the end of the first switching element connected to the compressor is connected to a third port of the heat exchanger, a fourth port of the heat exchanger is connected to a second end of the compressor by the main circuit valve, and the end of the first switching element connected to the enhanced vapor injection valve is connected to the fourth port of the heat exchanger by the second switching element.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: August 27, 2019
    Assignee: Gree Electric Appliances, Inc. of Zhuhai
    Inventors: Feng Wei, Haidong Lin, Weiping Zheng, Chuanhua Wang, Si Sun, Chengsong Wu, Enquan Zhang
  • Patent number: 10267539
    Abstract: A vapor compression system comprising a centrifugal compressor (22) having: an inlet (24); an outlet (26); a first impeller stage (28); a second impeller stage (30); and a motor (34) coupled to the first impeller stage and second impeller stage. A first heat exchanger (38) is downstream of the outlet along a refrigerant flowpath. An expansion device (56) and a second heat exchanger (64) are upstream of the inlet along the refrigerant flowpath. A bypass flowpath (120; 320) is positioned to deliver refrigerant from the compressor bypassing the first heat exchanger. A valve (128) is positioned to control flow through the bypass flowpath, wherein: the bypass flowpath extends from a first location (140) intermediate the inlet and outlet to a second location (142; 342) downstream of the first heat exchanger along the refrigerant flowpath.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: April 23, 2019
    Assignee: Carrier Corporation
    Inventor: Vishnu M. Sishtla
  • Patent number: 10254014
    Abstract: A centrifugal chiller in which a closed-cycle refrigeration cycle is formed by connecting a compressor, a condenser, an economizer and decompression means forming a multi-stage compression cycle, and an evaporator, with the refrigeration cycle being charged with a low-pressure refrigerant. The condenser and the economizer are integrated with each other by having a portion of their vessel walls form a shared wall, with the base surface of the economizer being positioned below the base surface of the condenser and above the base surface of the evaporator.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: April 9, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
    Inventors: Naoya Miyoshi, Kenji Ueda, Yasushi Hasegawa
  • Patent number: 10155430
    Abstract: There is disclosed a vehicle air-conditioning device in which a heating qualification by gas injection can sufficiently be obtained. The vehicle air-conditioning device comprises a compressor 2 which compresses a refrigerant, an air flow passage 3 through which air to be supplied into a vehicle interior flows, a radiator 4 disposed in the air flow passage to let the refrigerant radiate heat, a heat absorber 9 disposed in the air flow passage to let the refrigerant absorb heat, an outdoor heat exchanger 7 disposed outside the vehicle interior to let the refrigerant radiate or absorb heat, and a controller. The controller executes a heating mode in which the refrigerant discharged from the compressor 2 radiates heat in the radiator 4 and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger 7.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: December 18, 2018
    Assignee: Sanden Holdings Corporation
    Inventors: Kenichi Suzuki, Megumi Shigeta
  • Patent number: 10131208
    Abstract: There is disclosed a vehicle air-conditioning device in which a heating qualification by gas injection can sufficiently be obtained. The vehicle air-conditioning device comprises a compressor 2 which compresses a refrigerant, an air flow passage 3 through which air to be supplied into a vehicle interior flows, a radiator 4 disposed in the air flow passage to let the refrigerant radiate heat, a heat absorber 9 disposed in the air flow passage to let the refrigerant absorb heat, an outdoor heat exchanger 7 disposed outside the vehicle interior to let the refrigerant radiate or absorb heat, and a controller. The controller executes a heating mode in which the refrigerant discharged from the compressor 2 radiates heat in the radiator 4 and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger 7.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: November 20, 2018
    Assignee: Sanden Holdings Corporation
    Inventors: Kenichi Suzuki, Megumi Shigeta
  • Patent number: 10112458
    Abstract: There is disclosed a vehicle air-conditioning device in which a heating qualification by gas injection can sufficiently be obtained. The vehicle air-conditioning device comprises a compressor 2 which compresses a refrigerant, an air flow passage 3 through which air to be supplied into a vehicle interior flows, a radiator 4 disposed in the air flow passage to let the refrigerant radiate heat, a heat absorber 9 disposed in the air flow passage to let the refrigerant absorb heat, an outdoor heat exchanger 7 disposed outside the vehicle interior to let the refrigerant radiate or absorb heat, and a controller. The controller executes a heating mode in which the refrigerant discharged from the compressor 2 radiates heat in the radiator 4 and the refrigerant by which heat has been radiated is decompressed and then absorbs heat in the outdoor heat exchanger 7.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: October 30, 2018
    Assignee: Sanden Holdings Corporation
    Inventors: Kenichi Suzuki, Megumi Shigeta
  • Patent number: 10107526
    Abstract: The present invention discloses a switchable two-stage and cascade marine energy-saving ultralow-temperature refrigeration system which comprises a high-temperature level refrigeration system, a low-temperature level refrigeration system, a hot fluorine defrosting system of a high-temperature level air cooler and a hot fluorine defrosting system of a low-temperature level air cooler. The hot fluorine defrosting system of the high-temperature level air cooler comprises a high-temperature level compressor of which the outlet is divided into two paths through a first oil separator; and the second path is connected with an air suction port of the high-temperature level compressor through a first solenoid valve, the high-temperature level air cooler, a third solenoid valve, a first pressure relief valve, a first gas-liquid separator, a first one-way valve and a first heat regenerator.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: October 23, 2018
    Inventors: Jing Xie, Yaojun Guo, Jinfeng Wang, Yizhe Li, Minsheng Xu
  • Patent number: 10030653
    Abstract: A screw compressor housing having screw rotor bores, screw rotors, a drive for the screw rotors, and a slider in a slider receptacle for adjusting a volume ratio of the screw compressor and which extends in a direction towards the high-pressure outlet in a guide trough of the slider receptacle that is open towards the screw rotor bores and which is capable of being positioned in a first position and a second position, wherein the volume ratio of the screw compressor is greater in one of the positions than in the other of the positions, the slider connected to a first cylinder element and cooperates with a second cylinder element, the cylinder elements being at least partially arranged in the insertion space and arranged following the slider in the displacement direction thereof on a side of the slider that is opposite the high-pressure outlet.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: July 24, 2018
    Assignee: BITZER Kuehlmaschinenbau GmbH
    Inventor: Dominic Kienzle
  • Patent number: 10017031
    Abstract: The invention concerns an air conditioning system for conditioning the air of a passenger compartment of a motor vehicle including a housing with a first flow channel and a second flow channel for conducting air and a refrigerant circuit with an evaporator and a condenser. The evaporator is arranged in the first flow channel and the condenser in the second flow channel. The air conditioning system is designed for cooling and heating the passenger compartment and for a reheat operation. The setting of the operating mode is done only via the controlling of air guidance mechanisms. One of the heat exchangers evaporator or condenser is arranged with a part of the heat transfer surface in both the first and the second flow channel.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: July 10, 2018
    Assignee: HANON SYSTEMS
    Inventors: Torsten Klein, Roberto Della Rovere, Marc Graaf, Gerald Richter, Felix Girmscheid
  • Patent number: 10018401
    Abstract: If an exterior heat exchanger is sensed to be frosted while a heat pump device is operating in a first heating operation mode in which two interior heat exchangers are used, the operation modes are switched into a second heating operation mode in which one interior heat exchanger is used, and then switched into a defrosting operation mode.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: July 10, 2018
    Assignees: JAPAN CLIMATE SYSTEMS CORPORATION, PANASONIC CORPORATION
    Inventors: Hiroshi Hamamoto, Kohei Fukawatase, Yoshihiko Otake, Kou Komori, Subaru Matsumoto, Norihiro Miyamura
  • Patent number: 10018393
    Abstract: A method for controlling an economizer circuit is provided. The economizer circuit includes a valve to regulate refrigerant flow between the economizer and the compressor. The valve can be opened to engage the economizer circuit or closed to disengage the economizer circuit based on the output frequency provided to the compressor motor by a variable speed drive and an operating condition of the economizer.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: July 10, 2018
    Assignee: Johnson Controls Technology Company
    Inventors: William L. Kopko, Andrew John Graybill, Glenn Eugene Nickey, Israel Federman, Satheesh Kulankara
  • Patent number: 9994322
    Abstract: A system, which includes a plurality of heat exchangers and a compressing device, is configured to prepare in parallel a medium bled from a low-pressure location of an engine and flowing through a plurality of heat exchangers into a chamber. The compressing device is in communication with the plurality of heat exchangers and regulates a pressure of the medium flowing through the plurality of heat exchangers.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: June 12, 2018
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Louis J. Bruno, Donald E. Army, Jr., Thomas M. Zywiak, Erin G. Kline, Christina W. Millot, Harold W. Hipsky, Paul M. D'Orlando
  • Patent number: 9982925
    Abstract: An air conditioner and a method of controlling an air conditioner are provided. The method of controlling an air conditioner may include determining whether a low-load condition is satisfied on the basis of a number of indoor devices or a temperature of external air, performing a low-load operation of a compressor at a predetermined frequency when the low-load condition is satisfied, detecting whether an operation pressure is out of a target pressure value or range while the low-load operation is performed, and bypassing a refrigerant from the compressor to a gas/liquid separator via an injection passage when the operation pressure is out of the target pressure value or range.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: May 29, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Hongjae Lim, Jaewan Lee
  • Patent number: 9821700
    Abstract: A transport refrigeration system (TRS), a refrigerated transport unit, and a method of charging a thermal accumulator in a TRS are disclosed. The TRS includes a thermal accumulator including a phase change material (PCM) configured in a first state, to absorb thermal energy from the interior space of the transport unit during transformation to a second state. A heat exchanger, a portion of which is disposed within the thermal accumulator, is in thermal communication with the PCM. The TRS also includes an expansion device and a transport refrigeration unit (TRU). A heat transfer fluid circuit connects the TRU and the heat exchanger, and is configured to direct a heat transfer fluid from the TRU to the heat exchanger via the expansion device for charging the PCM.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: November 21, 2017
    Assignee: THERMO KING CORPORATION
    Inventors: Václav Rajtmajer, Michal Kolda, Markéta Kopecka, Michal Hegar, Pavel Houdek
  • Patent number: 9803897
    Abstract: An air conditioning system includes a refrigerant circuit including a compressor, an indoor heat exchanger, a first expansion valve, a gas-liquid separator, a second expansion valve, and an outdoor heat exchanger which are sequentially connected together to perform a two-stage expansion refrigeration cycle. The refrigerant circuit further includes: a gas injection pipe through which intermediate-pressure gas refrigerant in the gas-liquid separator flows into an intermediate port of the compressor, and a liquid-gas heat exchanger configured to exchange heat between low-pressure gas refrigerant obtained by evaporating refrigerant in the outdoor heat exchanger and travelling toward the compressor and intermediate-pressure liquid refrigerant travelling from the gas-liquid separator toward the second expansion valve.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: October 31, 2017
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Shuji Furui, Kazuhiro Furusho, Hiroshi Yoh
  • Patent number: 9791175
    Abstract: A method is provided for managing a flooded start of a compressor in a vapor compression system. Following an initial bump start, a determination is made as to whether working fluid in a liquid state remains in the sump of the compressor. If working fluid in a liquid state remains in the compressor sump, an additional bump start of the compressor is completed, followed by another determination as to whether working fluid in a liquid state still remains in the compressor sump. If working fluid in a liquid state remains in the compressor sump, another bump start of the compressor is initiated and the sequence repeated until no working fluid in the liquid state remains in the compressor sump. A normal start of the compressor may be initiated after determining no working fluid in the liquid state remains in the compressor sump.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: October 17, 2017
    Assignee: CARRIER CORPORATION
    Inventor: Raymond L Senf, Jr.
  • Patent number: 9791196
    Abstract: Provided is an air conditioning apparatus that is capable of suppressing increases in volume and cost of the apparatus and performing more suitable overheating protection. An electric compressor is an inverter-integrated electric compressor integrally including a compressor, an electric motor that drives the compressor, and an inverter including a temperature sensor that detects the temperature in the vicinity of a semiconductor switching device, wherein a controller estimates a discharge temperature of the compressor on the basis of a correlation of respective pressure loading characteristics for the detected temperature of the inverter, for the rotational speed of the compressor, and for the motive force of the compressor in a refrigerating cycle.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: October 17, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takayuki Hagita, Takayuki Takashige, Nobuya Nakagawa, Mikihiko Ishii, Takeshi Hirano, Koji Nakano, Masayuki Ishikawa
  • Patent number: 9682611
    Abstract: An air conditioning system, in particular for a motor vehicle, comprising a refrigerant circuit having at least one compressor, and comprising a coolant circuit having an external heat exchanger which is arranged in a heat pump system, wherein a redundant heat source is provided which is integrated in the heat pump system.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: June 20, 2017
    Assignee: MAHLE International GmbH
    Inventor: Joachim Haug
  • Patent number: 9681590
    Abstract: A cooling system that cools HV equipment includes a compressor that circulates refrigerant, a condenser that condenses the refrigerant, a gas-liquid separator that stores the refrigerant in liquid form that is condensed by the condenser, an expansion valve that reduces a pressure of the refrigerant, an evaporator that vaporizes the refrigerant that is reduced in pressure by the expansion valve, a first passage and a second passage through which the refrigerant flows from the gas-liquid separator toward the expansion valve, and that are provided in parallel, and a cooling portion that is provided along the second passage and cools the heat source using the refrigerant. The refrigerant in liquid form flows from the gas-liquid separator through the second passage.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: June 13, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, NIPPON SOKEN, INC
    Inventors: Kazuhide Uchida, Yuichi Ohno, Yoshiaki Kawakami, Yuki Jojima, Eizo Takahashi, Kousuke Sato
  • Patent number: 9651288
    Abstract: A refrigeration apparatus includes a compressor receiving refrigerant through an injection pipe and of discharging the refrigerant, a condenser, an electronic expansion valve connected by piping to another end of the injection pipe, a subcooling coil, a solenoid valve configured to control inflowing of the refrigerant through the injection pipe into the compressor, an injection bypass pipe connecting the injection pipe and a pipe on a suction side of the compressor, a solenoid valve configured to control passage of the refrigerant flowing through the injection bypass pipe, a high-low pressure bypass pipe connecting a pipe on a discharge side of the compressor and the pipe on the suction side of the compressor, a solenoid valve configured to control passage of the refrigerant through the high-low pressure bypass pipe, and a controller configured to control a frequency of the compressor and opening and closing of each of the solenoid valves.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: May 16, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenichi Hata, Hiroshi Sata
  • Patent number: 9581368
    Abstract: An automobile air-conditioning system is provided, which includes an evaporator and an electrical expansion valve in communication via pipes, with the electrical expansion valve including a coil and a valve body, the coil being fixedly mounted on the valve body; the system also includes a support, the support including a heat-sinking bridge and a cooling ring, with the evaporator provided on one side of the heat-sinking bridge and the cooling ring provided on the other side of the heat-sinking bridge; the heat-sinking bridge and the cooling ring are formed in one piece or are connected with each other fixedly, and the coil is provided within the cooling ring. The automobile air-conditioning system has the advantages of a compact structural design, is capable of effectively cooling the electrical expansion valve, and has high system strength, stable transmission of coolant, and high security.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: February 28, 2017
    Assignee: Hangzhou Sanhua Research Institute Co., Ltd.
    Inventors: Rongrong Zhang, Edwin J. Stanke, Longzhou Xu
  • Patent number: 9453669
    Abstract: A refrigeration unit includes an engine, a motor capable of producing a similar power output as the engine, and a compressor driven by one of the engine and the motor. The compressor includes a suction inlet and a discharge outlet. The refrigeration unit also includes a condenser in fluid communication with the discharge outlet through which pressurized, gaseous refrigerant is condensed, an evaporator in fluid communication with the condenser to receive liquid refrigerant and return gaseous refrigerant to the suction inlet, a passageway having a first end in fluid communication with an outlet of the condenser, and a second end in fluid communication with the suction inlet, and a purge valve defining at least a portion of the passageway between the first and second ends. The purge valve is operable to selectively divert liquid refrigerant from the condenser to the suction inlet to increase the pressure in the suction inlet.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: September 27, 2016
    Assignee: THERMO KING CORPORATION
    Inventors: Scott C. Milton, Stan O. Hoium, Peter W. Freund, Bradley M. Ludwig
  • Patent number: 9441861
    Abstract: Systems and methods in accordance with embodiments of the invention implement air conditioning systems that are operable to establish/maintain a desired temperature for a target space and simultaneously establish/maintain a temperature lower than the desired temperature for the target space for an included cold thermal energy storage unit. In one embodiment, an air conditioning system includes: a condensing unit; a liquid pressurizer and distributor ensemble; a cold thermal energy storage unit; a target space; and a suction gas/equalizer; where the listed components are operatively connected by piping such that vapor compression cycles can be simultaneously implemented that result in the cooling of the cold thermal energy storage unit and the target space; and the air conditioning system is configured such that the simultaneous implementation of vapor compression cycles results in cooling the cold thermal energy storage unit to a greater extent relative to the target space.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: September 13, 2016
    Assignee: Axiom Exergy Inc.
    Inventors: Anthony Diamond, Amrit Robbins
  • Patent number: 9310086
    Abstract: An air-conditioning apparatus including an outdoor unit having a compressor for compressing a refrigerant and a heat source side heat exchange for exchanging heat between the refrigerant and air, a plurality of indoor units having use side heat exchangers for exchanging heat between a heat transfer medium that flows therein and air, and relay unit disposed between the outdoor unit and the indoor units. The relay unit exchanges heat between the refrigerant conveyed from the outdoor unit and the heat transfer medium flowing in the indoor units. The relay unit includes a main relay unit that is connected to the outdoor unit with two pipes and a sub relay unit that is connect to the main relay unit with three pipes.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: April 12, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuji Motomura, Koji Yamashita, Hiroyuki Morimoto, Shinichi Wakamoto, Naofumi Takenaka
  • Patent number: 9297569
    Abstract: A system and method for cooling an environmental test chamber is described where a controller is in communication with an auxiliary cooling unit and the primary refrigeration unit. A first chamber temperature measurement associated with the environmental test chamber is received, and the heat load associated with a target temperature is determined. Based on the first chamber temperature measurement and the heat load, it is determined that the auxiliary cooling unit can sustain the target temperature. In response to the determination, the controller is used to transmit a signal to power on the auxiliary cooling unit and a signal to time out the primary refrigeration unit.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: March 29, 2016
    Assignee: Raytheon Company
    Inventors: Mark A. Taylor, Don R. Tolbert
  • Patent number: 9285145
    Abstract: An evaporator (500) comprises a first header (501) defining one end formed with a first refrigerant port (5010), a second header (502) defining one end formed with a second refrigerant port (5020), heat-exchange tubes (503) each connected between the headers (501, 502) to communicate the headers (501, 502), fins (504) respectively interposed between adjacent heat-exchange tubes (503), and a defrosting tube (505) defining a first end connected to one of the headers (501, 502) to communicate with an interior of the one header. A position of the first end of the defrosting tube (505) is spaced apart from the one end of the one header by a predetermined distance. A refrigeration system comprises the evaporator. By providing the defrosting tube (505), defrosting speed is increased, defrosting time is shortened, and energy efficiency of the refrigeration system is improved.
    Type: Grant
    Filed: December 24, 2010
    Date of Patent: March 15, 2016
    Assignee: SANHUA (HANGZHOU) MICRO CHANNEL HEAT EXCHANGE CO., LTD.
    Inventors: Qiang Gao, Yanxing Li
  • Patent number: 9194619
    Abstract: In order to improve a refrigeration system comprising a refrigeration circuit, in which a refrigerant compressor, a condenser following on from the refrigerant compressor, an expansion device following on from the condenser and an evaporator following on from the expansion device are arranged, the evaporator being connected to the refrigerant compressor, wherein the refrigerant compressor has a drive motor speed-controlled by an electronic motor control and a control cooling branch which has refrigerant flowing through it, branches off from the refrigeration circuit between the condenser and the expansion device and is guided to a connection of the refrigerant compressor and in which a cooling element is arranged which is connected in a heat conducting manner to electronic power components of the motor control, in such a manner that disruption to the operation of the motor control is avoided as far as possible it is suggested that a regulating device be provided for the control cooling branch and this regulat
    Type: Grant
    Filed: March 19, 2013
    Date of Patent: November 24, 2015
    Assignee: BITZER Kuehlmaschinenbau GmbH
    Inventors: Birte Margotti, Stephan Roelke
  • Patent number: 9157446
    Abstract: This disclosure relates to a centrifugal compressor. In a first example, the compressor includes a first impeller provided in a main refrigerant flow path, a second impeller provided in the main refrigerant flow path downstream of the first impeller, and a recirculation flow path. In the first example, the recirculation flow path is provided between a first location and a second location along the main refrigerant flow path. The first location is downstream of the second location, and the second location is downstream of the first impeller. In a second example, the compressor includes an impeller provided in a main refrigerant flow path, and a recirculation flow path provided between a first location and a second location along the main refrigerant flow path. In the second example, the recirculation flow path includes a recirculation volute. Further disclosed is a method for operating a centrifugal compressor.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: October 13, 2015
    Assignee: DANFOSS A/S
    Inventors: Joost Brasz, Mogens Rasmussen
  • Patent number: 9121627
    Abstract: A system and method for controlling an economizer circuit is provided. The economizer circuit includes a valve to regulate refrigerant flow between the economizer and the compressor. The valve can be opened to engage the economizer circuit or closed to disengage the economizer circuit based on the output frequency provided to the compressor motor by a variable speed drive and an operating condition of the economizer.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: September 1, 2015
    Assignee: Johnson Controls Technology Company
    Inventors: William L. Kopko, Andrew John Graybill, Glenn Eugene Nickey, Israel Federman, Satheesh Kulankara
  • Patent number: 9097444
    Abstract: A heat pump type water heating apparatus is provided that includes a refrigeration cycle circuit having a first refrigerant and water heat exchanger to perform a heat exchange between a first refrigerant and water, and a first refrigerant and second refrigerant heat exchanger to perform a heat exchange between the first refrigerant and a second refrigerant. The heat pump type water heating apparatus may also include a cascade circuit having the first refrigerant and second refrigerant heat exchanger to operate jointly with the refrigeration cycle circuit, the cascade circuit also having a second refrigerant and water heat exchanger to perform a heat exchange between the second refrigerant and water, and a water heating channel connected to the first refrigerant and water heat exchanger and the second refrigerant and water heat exchanger so water passes through the first refrigerant and water heat exchanger and then through the second refrigerant and water heat exchanger.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: August 4, 2015
    Assignee: LG Electronics Inc.
    Inventors: Donghyuk Lee, Jongchul Ha
  • Patent number: 9010136
    Abstract: The invention relates to a method for operating a refrigerating installation, according to which the cooling liquid temperature is controlled and stabilized upstream of the expansion valve, and the suction vapor temperature is controlled and stabilized upstream of the condenser in dry expansion systems, thermosyphon installations, two-stage evaporation installations, dry expansion installations having a downstream internal heat exchanger (IWT), and all other refrigerating systems.
    Type: Grant
    Filed: January 28, 2004
    Date of Patent: April 21, 2015
    Assignee: BMS-Energietechnik AG
    Inventor: Remo Meister
  • Publication number: 20150096321
    Abstract: A refrigeration apparatus uses R32 as a refrigerant, and includes a compressor, a condenser, an expansion mechanism, an evaporator, an intermediate injection channel and a suction injection channel. The intermediate injection channel guides a part of the refrigerant flowing from the condenser toward the evaporator to the compressor, causing the refrigerant to merge with intermediate-pressure refrigerant of the compressor. The suction injection channel guides a part of the refrigerant flowing from the condenser toward the evaporator to the suction passage, causing the refrigerant to merge with low-pressure refrigerant sucked into the compressor.
    Type: Application
    Filed: April 19, 2013
    Publication date: April 9, 2015
    Inventors: Satoshi Kawano, Shinya Matsuoka, Masahiro Oka
  • Patent number: 8931288
    Abstract: In various implementations, air conditioners may include a high pressure portion and a low pressure portion. A bypass line may divert a portion of the refrigerant from the high pressure portion to the low pressure portion to reduce the pressure of at least a part of the high pressure portion. The bypass line may be opened automatically.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: January 13, 2015
    Assignee: Lennox Industries Inc.
    Inventors: Yi Qu, Der-Kai Hung
  • Patent number: 8899058
    Abstract: Heating equipment, including a first heat exchanger, a compressor, a second heat exchanger, and a first expansion valve that decompresses a refrigerant flowing from the second heat exchanger to the first heat exchanger, are connected so as to circulate the refrigerant. A third heat exchanger provides heat of the refrigerant flowing from the second heat exchanger to the first heat exchanger to the refrigerant flowing from the first heat exchanger toward the compressor. An injection circuit merges part of the refrigerant flowing from the second heat exchanger to the first heat exchanger with the refrigerant that is sucked by the compressor. An injection expansion valve is installed in the injection circuit and decompresses the refrigerant flowing in the injection circuit. A fourth heat exchanger is installed in the injection circuit to supply heat of the refrigerant flowing from the second heat exchanger toward the first heat exchanger to the refrigerant flowing in the injection circuit.
    Type: Grant
    Filed: March 27, 2006
    Date of Patent: December 2, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumitake Unezaki, Makoto Saitou, Tetsuji Saikusa, Masanori Aoki, Masato Yosomiya
  • Patent number: 8863545
    Abstract: A refrigeration apparatus includes a multi-stage compression mechanism, heat source-side and usage side heat exchangers each operable as a radiator/evaporator, a switching mechanism switchable between cooling and heating operation states, a second-stage injection tube, an intermediate heat exchanger and an intermediate heat exchanger bypass tube. The intermediate heat exchanger bypass tube ensures that refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element is not cooled by the intermediate heat exchanger during a heating operation. Injection rate optimization controls a flow rate of refrigerant returned to the second-stage compression element through the second-stage injection tube so that an injection ratio is greater during the heating operation than during a cooling operation.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: October 21, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Shuji Fujimoto, Atsushi Yoshimi
  • Patent number: 8752398
    Abstract: The invention relates to a refrigerating device (10), in particular for an aircraft, having a refrigerant circuit, in which a refrigerant container (12), an expansion valve (14), an evaporator (16), a compressor (20) and a condenser (22) are disposed. To save energy during operation and to increase the reliability and availability of the refrigerating device (10), in the refrigerant circuit there is a compressor bypass line (26), in which a bypass valve (18) is disposed, and a refrigerant pump (30) that is disposed downstream of the condenser (22) and upstream of the evaporator (16). It is possible to dispense with the refrigerant pump (30) if the condenser (22) is disposed at a higher level than the evaporator (16) in the refrigerant circuit.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: June 17, 2014
    Assignee: Airbus Deutschland GmbH
    Inventors: Wilson Willy Casas Noriega, Stefan Wischhusen, Wolfgang Ebigt, Dirk Kastell
  • Publication number: 20140109605
    Abstract: In various implementations, air conditioners may include a high pressure portion and a low pressure portion. A bypass line may divert a portion of the refrigerant from the high pressure portion to the low pressure portion to reduce the pressure of at least a part of the high pressure portion. The bypass line may be opened automatically.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 24, 2014
    Inventors: Yi Qu, Der-Kai Hung
  • Patent number: 8671704
    Abstract: A refrigeration system includes a compressor; a condenser connected to a first inlet of a separator which has: a vapor outlet connected to the compressor and a liquid outlet connected to an evaporator; a selecting valve having: a first vapor inlet connected to the evaporator; a second vapor inlet connected to the separator; and a vapor outlet connected to the compressor, the selecting valve being operated to selectively and alternatively communicate its first and second vapor inlets with its vapor outlet, so as to allow the compressor to draw vapor from the separator and from the evaporator; and a control unit for controlling the operation of the selecting valve.
    Type: Grant
    Filed: June 15, 2009
    Date of Patent: March 18, 2014
    Assignees: Whirlpool S.A., Universidade Federal de Santa Catarina (UFSC), Autarquia Federal de Regime Especial
    Inventors: Augusto Jose Pereira Zimmermann, Gustavo Portella Montagner, Joaquim Manoel Goncalves
  • Patent number: 8635879
    Abstract: A heat pump and a method of controlling a heat pump are provided. The heat pump may perform gas injection through a plurality of coolant injection circuits formed in a compressor, such as a scroll compressor, to increase a corresponding flow rate. The heat pump may control the plurality of coolant injection circuits based on one or more operation conditions by selecting an appropriate optimal middle pressure from a high-and-low pressure difference, a pressure ratio, and a compression ratio of the compressor to enhance cooling/heating performance.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: January 28, 2014
    Assignee: LG Electronics Inc.
    Inventors: Byoungjin Ryu, Yonghee Jang
  • Patent number: 8528359
    Abstract: A refrigerant vapor compression system includes a compression device, a heat rejecting heat exchanger, an economizer heat exchanger, an expander and an evaporator disposed in a refrigerant circuit. An evaporator bypass line is provided for passing a portion of the refrigerant flow from the main refrigerant circuit after having traversed a first pass of the economizer heat exchanger through the expander to partially expand it to an intermediate pressure and thence through a second pass of the economizer heat exchanger and into an intermediate pressure stage of the compression device. An economizer bypass line is also provided for passing a portion of the refrigerant from the main refrigerant circuit after having traversed the heat rejecting heat exchanger through a restrictor type expansion device and thence into the evaporator bypass line as liquid refrigerant or a mix of liquid and vapor refrigerant for injection into an intermediate pressure stage of the compression device.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: September 10, 2013
    Assignee: Carrier Corporation
    Inventors: Alexander Lifson, Michael F. Taras
  • Patent number: 8424333
    Abstract: An air conditioner is provided. The air conditioner includes: an outdoor heat exchange unit in which a plurality of refrigerant tubes are disposed to be separated in a plurality of columns in a vertical direction to exchange heat of outdoor air and a refrigerant; a first refrigerant distribution device having branch pipes connected to a plurality of refrigerant tubes, respectively, of an upper part among the plurality of refrigerant tubes; a second refrigerant distribution device having branch pipes connected to a plurality of refrigerant tubes, respectively, of a lower part among the plurality of refrigerant tubes; and a communication pipe for communicating one of the branch pipes of the first refrigerant distribution device and one of the branch pipes of the second refrigerant distribution device.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: April 23, 2013
    Assignee: LG Electronics Inc.
    Inventors: Pil Hyun Yoon, Hyun Ju Kwag, Seok Hoon Jang
  • Patent number: 8413455
    Abstract: An air conditioning system is provided. The air conditioning system allows coolant to selectively flow through a series of bypass pipes and valves connecting an outlet of a compressor and an outlet of an expansion member. The series of bypass pipes and valves allow a defrosting function to be performed without performing a reverse cycle.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: April 9, 2013
    Assignee: LG Electronics Inc.
    Inventors: Jae Hoon Sim, Deok Huh, Seung Hee Ryu, Seong Won Bae
  • Patent number: 8322155
    Abstract: A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: December 4, 2012
    Assignee: American Power Conversion Corporation
    Inventors: Ozan Tutunoglu, John H. Bean, Jr.
  • Patent number: 8308936
    Abstract: A heat pump type hot water supply device is provided with a heat source side heat pump unit having a heat radiating heat exchanger that condenses refrigerant to radiate heat from the refrigerant. The hot water supply device is provided with a water tank that stores water, a water supply pipe that supplies water to the water tank from the outside, a water circulation pipe that is extended in a bypassing manner and circulates the water in the water tank from a bottom section to an upper section, a heat absorbing heat exchanger that is arranged on the water circulation pipe and connected to the heat radiating heat exchanger of the heat source side heat pump unit so as to absorb heat, and a hot water supply unit that comprises a hot water supply pipe that supplies warm water in the upper section of the water tank to the outside.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: November 13, 2012
    Assignee: Daikin Industries, Ltd.
    Inventors: Mitsuharu Numata, Haruo Nakata, Syuuji Furui, Kaori Yoshida
  • Patent number: 8250874
    Abstract: A subcool condenser having a condensation heat exchange portion, a receive portion and a supercool heat exchange portion is used as an outdoor heat exchanger that functions as a radiator in a cooling operation mode so that COP in the cooling operation mode is increased. In contrast, in a heating operation mode, a refrigerant bypass device that causes the refrigerant to flow so as to bypass the supercool heat exchange portion is provided so that pressure loss generated in the refrigerant flowing through the outdoor heat exchanger is decreased. Thereby, driving force of a compressor can be decreased and COP in the heating operation mode can be improved.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: August 28, 2012
    Assignee: Denso Corporation
    Inventors: Makoto Ikegami, Hiroshi Oshitani, Yoshiaki Takano
  • Publication number: 20120167606
    Abstract: In a refrigeration cycle apparatus that recovers power in an expander, obtaining a refrigeration cycle apparatus that is capable of reliably starting up the expander compared to conventional refrigeration cycle apparatuses. The refrigeration cycle apparatus includes a refrigerant circuit having a first compressor, a radiator, an expander and an evaporator connected in series with a piping; and a second compressor disposed between the first compressor and the radiator, the second compressor being driven by power recovered by the expander. The second compressor being a positive displacement compressor. The refrigeration cycle apparatus, further including a pressure regulating device (a bypass and an on-off valve) that maintains a pressure on a discharge side of the second compressor to be lower than a pressure on a suction side of the second compressor at least until the second compressor is started up.
    Type: Application
    Filed: October 7, 2009
    Publication date: July 5, 2012
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yusuke Shimazu, Keisuke Takayama, Masayuki Kakuda, Hideaki Nagata, Takeshi Hatomura
  • Patent number: 8186180
    Abstract: An ejector-type refrigerant cycle device includes: a first evaporator 15 that evaporates refrigerant flowing out of an ejector 14; a branch passage 17 that branches a flow of refrigerant between a radiator 13 and the ejector 14 and guides this flow of refrigerant to a vapor-phase refrigerant suction port 14c of the ejector 14; a throttling mechanism 18 disposed in the branch passage 17; and a second evaporator 19 disposed downstream of the throttling mechanism 18 with respect to the flow of refrigerant. The throttling mechanism 18 is constructed to be provided with a fully opening function, and to fully open the branch passage 17 when the second evaporator 19 is defrosted. Therefore, in an ejector-type refrigerant cycle device including multiple evaporators, the function of defrosting the evaporators can be carried out with a simple construction.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: May 29, 2012
    Assignee: Denso Corporation
    Inventors: Hiroshi Oshitani, Hirotsugu Takeuchi, Etsuhisa Yamada, Haruyuki Nishijima
  • Patent number: 8190328
    Abstract: An electropneumatic control arrangement for an automatic vehicle level control system, particularly of a commercial vehicle, includes at least; a solenoid valve unit having at least two electropneumatic solenoid valves, a compressed air inlet for infeeding compressed air, at least one compressed air connection for at least one air bellows and electrical control inputs, and an electronic control unit for actuating the solenoid valve unit. The electronic control unit comprises control outputs for electrically connecting to the control inputs of the solenoid valve unit. A plug connector is configured on the housing of the solenoid valve unit, in which the electrical control inputs are disposed, and a plug connector is provided on the housing of the electronic control unit, in which the control outputs are disposed. The plug connectors are mechanically plugged into each other.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: May 29, 2012
    Assignee: WABCO GmbH
    Inventors: Ingo Jovers, Berend Kleen, Johann Lucas, Frauke Rathjen, Andreas Rutsch, Andreas Schwarzer, Thomas Stellmacher