Plural Compressors Or Multiple Effect Compression Patents (Class 62/510)
  • Patent number: 10808969
    Abstract: A compressor (22) has a male rotor (52), a female rotor (54), and a housing (50). The housing has a first bore (114) and a second bore (116) respectively accommodating portions of the male rotor and the female rotor. The housing has an inlet (26), an outlet (28), an economizer port (150) along at least one of the first bore and the second bore, and an external port (46) communicating with the economizer port. The housing has a chamber (152) between the economizer port and the external port having a volume of at least 0.8 liter.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: October 20, 2020
    Assignee: Carrier Corporation
    Inventors: Amit Vaidya, David M. Rockwell, Peter J. Pileski
  • Patent number: 10794617
    Abstract: A thermal management system comprises a first heat exchanger configured to exchange heat between a first component and a first working fluid, a first working fluid compressor downstream in first working fluid flow of the first heat exchanger and configured to compress the first working fluid, a second heat exchanger downstream in first working fluid flow of the compressor and configured to exchange heat between the first working fluid and a second working fluid and an expander downstream in first working fluid flow of the second heat exchanger, and configured to expand and cool first working fluid and deliver cooled first working fluid to the first heat exchanger. The system further comprises a third heat exchanger upstream in second working fluid flow of the second heat exchanger, and configured to exchange heat between a second component and the second working fluid.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: October 6, 2020
    Assignee: ROLLS-ROYCE plc
    Inventor: Matthew Moxon
  • Patent number: 10746461
    Abstract: The present invention relates to a cryogenic air separation process that provides high pressure oxygen for an oxy-fired combustion of a fuel (e.g., a carbonaceous fuel). The air separation process can be directly integrated into a closed cycle power production process utilizing a working fluid, such as CO2. Beneficially, the air separation process can eliminate the need for inter-cooling between air compression stages and rather provide for recycling the adiabatic heat of compression into a process step in further methods wherein an additional heat supply is beneficial.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: August 18, 2020
    Assignee: 8 Rivers Capital, LLC
    Inventor: Rodney John Allam
  • Patent number: 10621851
    Abstract: Aspects of the disclosure relate to reducing replacing a desiccant cartridge based upon a condensation risk. In one example, first information corresponding to a current dew point within a sensor housing of a sensor and second information identifying temperature data corresponding to a predefined area where the sensor is projected to travel may be received. Based upon the first and second information a condensation risk corresponding to the likelihood of condensation forming within the sensor housing in the event it traveled within the predefined area based upon the current dew point and the temperature data may be determined. Based upon the determined condensation risk, an indication that a desiccant cartridge within the sensor housing should be replaced to reduce the current dew point and the condensation risk may be provided.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: April 14, 2020
    Assignee: Waymo LLC
    Inventors: Darren Xinhang Chen, David Gordon Duff, Alexander Norton Meade
  • Patent number: 10408500
    Abstract: The purpose of the present invention is to install an economizer having a sufficient internal volume in a compact turbo refrigeration apparatus specifically using a low-pressure refrigerant, and reduce refrigerant pressure loss and enhance efficiency in the turbo refrigeration apparatus. The turbo refrigeration apparatus according to the present invention comprises: a turbo compressor which compresses a refrigerant; a condenser which condenses the compressed refrigerant; a control valve which causes the condensed refrigerant to expand; an evaporator which causes the expanded refrigerant to evaporate; and an economizer which is installed in such a manner as to be sandwiched between the condenser and the evaporator, and separates the refrigerant expanded by the control valve into gas and liquid. The economizer is installed adjacent to a curved wall, having a drum shell shape, of the condenser and/or the evaporator, the curved wall being shared with the structural wall of the economizer.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: September 10, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.
    Inventors: Naoya Miyoshi, Kenji Ueda, Noriyuki Matsukura
  • Patent number: 10330350
    Abstract: Provided herein is a compression system including a compressor, an intermediate air compensation pipeline, and an air compensation valve disposed on the intermediate air compensation pipeline. According to a flow direction of a refrigerant, a first pressure detection device and a first temperature detection device are disposed at the inlet end of the air compensation valve on the intermediate air compensation pipeline; a second temperature detection device is disposed at the outlet end of the air compensation valve. The system also includes a second pressure detection device and a third temperature detection device disposed on an exhaust pipeline of the compressor.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: June 25, 2019
    Assignee: Gree Electric Appliances, Inc. of Zhuhai
    Inventors: Huan Zhao, Feng Tan, Pengfei Li, Youxuan Liang
  • Patent number: 10215469
    Abstract: A cooling cycle apparatus for a refrigerator includes a first compressor, a condenser for condensing a refrigerant compressed in the first compressor, a first expansion device for lowering a temperature and a pressure of a portion of the condensed refrigerant, a first evaporator for evaporating the refrigerant, a second expansion device for lowering a temperature and a pressure of a remaining portion of the refrigerant, a gas-liquid separator for separating a liquid-phase refrigerant from a gas-phase refrigerant in the refrigerant, a third expansion device for lowering a temperature and a pressure of the liquid-phase refrigerant, a second evaporator for evaporating the refrigerant that has passed through the third expansion device, and a second compressor for compressing the refrigerant that has passed through the second evaporator and transferring the refrigerant to the first compressor, wherein the refrigerant that has passed through the first evaporator and the gas-phase refrigerant separated in the gas-li
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: February 26, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Sunam Chae, Kyungseok Kim, Kyunghun Cha
  • Patent number: 10047991
    Abstract: A heat pump includes a first cycle device and a second cycle device. The first cycle device is connected such that, in a heating operation, a first refrigerant is circulated in an order of a first compressor, a 4-way valve, a first heat exchanger, a second heat exchanger, a first expansion mechanism, a third heat exchanger, the 4-way valve, and the first compressor, and such that, in a cooling operation, the first refrigerant is circulated in an order of the first compressor, the 4-way valve, the third heat exchanger, the first expansion mechanism, the second heat exchanger, the first heat exchanger, the 4-way valve, and the first compressor. The second cycle device is connected such that a second refrigerant is circulated in an order of a second compressor, a fourth heat exchanger, a second expansion mechanism, the second heat exchanger, and the second compressor.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: August 14, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Kidong Kim, Jongchul Ha, Jiwon Chang, Hyunjong Kim
  • Patent number: 9939179
    Abstract: A refrigeration system includes a plurality of compressors connected in series with each other. Each compressor has an oil sump located in a gravitational bottom of the compressor. A common supply line supplies refrigerant and oil to each of the plurality of compressors. The plurality of compressors includes a lead compressor and one or more non-lead compressors. The common supply line is configured to return more oil to the lead compressor than to the one or more non-lead compressors. Oil sump pressures for the plurality of compressors are maintained such that the lead compressor has the highest oil sump pressure, and the oil sump pressures of the non-lead compressors are successively lower with respect to its position downstream of the lead compressor. As a result, oil is distributed between adjacent compressors from the lead compressor, which is a most upstream compressor, sequentially downstream to the one or more non-lead compressors.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: April 10, 2018
    Assignee: BITZER Kuehlmaschinenbau GmbH
    Inventor: Bruce A. Fraser
  • Patent number: 9739519
    Abstract: A refrigeration system includes a compressor having a first stage and a second stage; a heat rejecting heat exchanger including an inter-cooler and a gas cooler, the intercooler coupled to an outlet of the first stage and the gas cooler coupled to an outlet of the second stage; an unload valve coupled to an outlet of the intercooler and a suction port of the first stage; a flash tank coupled to an outlet of the gas cooler; a primary expansion device coupled to an outlet of the flash tank; a heat absorbing heat exchanger coupled to an outlet of the primary expansion device, an outlet of the heat absorbing heat exchanger coupled to the suction port of the first stage; and a controller for executing a startup process including controlling the unload valve to direct refrigerant from the intercooler to the suction port of the first stage.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: August 22, 2017
    Assignee: CARRIER CORPORATION
    Inventors: Mingfei Gan, KeonWoo Lee, Hans-Joachim Huff, Aryn Shapiro, Lucy Yi Liu, Gilbert B. Hofsdal, Jian Sun
  • Patent number: 9599378
    Abstract: A heat pump hot-water supply apparatus controls a second expansion device during a heating operation so as to adjust the amount of refrigerant flowing through an injection pipe, and controls a third expansion device during a cooling operation so as to adjust the amount of refrigerant flowing through the injection pipe.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: March 21, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Yamashita, Hiroyuki Morimoto, Katsuhiro Ishimura, Shinichi Wakamoto, Naofumi Takenaka
  • Patent number: 9464828
    Abstract: A natural coolant refrigerating plant includes a motor-driven compressor with two compression stages, at least one jacket for heating and/or cooling a product being processed, an intercooler located upstream of the second compression stage and a gas-cooler located downstream of an outlet from a second compression stage. A first branch connects an outlet of the gas-cooler with an inlet of the first stage of the motor-driven compressor for recovering a predetermined quantity of coolant.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: October 11, 2016
    Assignee: ALI S.p.A.—CARPIGIANI GROUP
    Inventors: Andrea Cocchi, Roberto Lazzarini
  • Patent number: 9322403
    Abstract: A compressor includes a compression mechanism, a drive shaft, a bearing, and an oil supply passage configured to supply lubrication oil to a clearance between the drive shaft and the bearing. The drive shaft includes a large-diameter shaft part supported by the bearing, and a small-diameter shaft part connected to a lower end part of the large-diameter shaft part. A sealing part is configured to reduced or prevent oil leakage from the bearing includes an oil receiving surface formed in the bearing housing so as to face a stepped surface formed at a boundary between the large-diameter shaft part and the small-diameter shaft part. A clearance is formed between the oil receiving surface and the stepped surface so as to surround an outer periphery of the small-diameter shaft part.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: April 26, 2016
    Assignee: Daikin Industries, Ltd.
    Inventor: Youhei Nishide
  • Publication number: 20150143826
    Abstract: A refrigeration system includes: a compressor arrangement for compressing gaseous refrigerant from a first pressure to a second pressure, wherein the second pressure comprises a condensing pressure; a first condenser evaporator system and a second condenser evaporator system, where in the first condenser evaporator system and the second condenser evaporator system are arranged in parallel and each comprises: (1) a condenser for receiving gaseous refrigerant at a condensing pressure and condensing the refrigerant to a liquid refrigerant, where in the condenser comprises a gaseous refrigerant inlet, a plate and a liquid refrigerant outlet, and a water delivery system for delivering water to an outside of the plate for removing heat from the plate; (2) a controlled pressure receiver for holding the liquid refrigerant from the condenser; and (3) an evaporator for evaporating the liquid refrigerant from the controlled pressure receiver to form the gaseous refrigerant; a first gaseous refrigerant feed line for feed
    Type: Application
    Filed: October 31, 2014
    Publication date: May 28, 2015
    Inventor: John Lingelbach
  • Patent number: 9038404
    Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: May 26, 2015
    Assignee: Liebert Corporation
    Inventors: John F. Judge, Timothy J. Schrader, Stephen Sillato, Roger Noll, Gary A. Helmink, Pierpaolo Barbato, Giuseppe Dalla Mana, Lou Monnier, Zhiyong Lin, Benedict J. Dolcich, Daniel J. Schutte, Greg Haggy, Thomas Harvey, Zongtao Lu
  • Patent number: 9027363
    Abstract: An economizer is provided in a multistage compression refrigeration system including a refrigerant circuit in which a multistage compressor, a condenser, a multistage expansion mechanism, and an evaporator are sequentially connected. The economizer includes: a tank having an introducing portion for introducing a refrigerant of the refrigerant circuit, a liquid outlet for guiding a liquid refrigerant into the evaporator, and a gas outlet for guiding a gas refrigerant into a medium pressure portion of the multistage compressor; and a float expansion valve, which forms part of the multistage expansion mechanism and is attached to the liquid outlet, and whose throttle amount is adjusted according to a level of the liquid refrigerant in the tank. Multiple ones of the liquid outlet and multiple ones of are provided.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: May 12, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Yasutaka Takada, Nobuhiro Umeda, Kenji Kinokami
  • Publication number: 20150121949
    Abstract: A refrigeration cycle of a refrigerator includes a first refrigeration cycle in which a first refrigerant flows along a first refrigerant tube and a second refrigeration cycle in which a second refrigerant flows along a second refrigerant tube. First and second compressors compress each of the first and second refrigerants, and a combined condenser condenses each of the first and second refrigerants. First and second expansion valves phase-change each of the first and second refrigerants passing through the combined condenser, and first and second evaporators change the refrigerant passing through each of the first and second expansion valves into a low-temperature low-pressure gaseous refrigerant.
    Type: Application
    Filed: November 3, 2014
    Publication date: May 7, 2015
    Inventors: JUYEONG HEO, KYEONGYUN KIM, KYUNGSEOK KIM
  • Patent number: 8997518
    Abstract: The scroll compressor includes a fixed scroll including a first wrap, an orbiting scroll disposed to have a phase difference with respect to the fixed scroll, the orbiting scroll including a second wrap defining a compression chamber together with the first wrap, a suction part to receive a refrigerant into the compressor chamber, a driving shaft to transmit a rotation force to the orbiting scroll, a first injection part disposed in one position of the fixed scroll to introduce a refrigerant into the compression chamber, and a second injection part disposed in another position of the fixed scroll to introduce a refrigerant into the compression chamber, where the second wrap is disposed on the orbiting scroll such that the first injection part is opened to introduce the second refrigerant before the receipt of the first refrigerant through the suction part is completed during the orbiting of the orbiting scroll.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: April 7, 2015
    Assignee: LG Electronics Inc.
    Inventors: Yonghee Jang, Byoungjin Ryu, Baikyoung Chung, Beomchan Kim, Younghwan Ko, Byeongsu Kim
  • Patent number: 8991207
    Abstract: To provide a refrigerating cycle apparatus capable of improving cooling ability by water spray to perform an efficient operation while suppressing decrease in collected power by an expander. The refrigerating cycle apparatus includes: a first compressor that compresses the refrigerant; an expander that decompresses and expands the refrigerant to collect power for expansion; a second compressor that is driven by the power collected by the expander to further compresses the refrigerant compressed by the first compressor to transmit it to a main radiator; a heat exchanger having an intercooler that cools the refrigerant compressed by the first compressor and a main radiator that cools the refrigerant compressed by the second heat exchanger to transmit it to the expander; indoor heat exchangers that heat the refrigerant decompressed by the expander; and a water spray apparatus that sprays water onto the outer surface of the intercooler and the main radiator.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Takayama, Yusuke Shimazu
  • Patent number: 8984904
    Abstract: A refrigerating device is provided which can improve COP when a required load is 50% of a maximum load or below. When the load required of a common evaporator is 50% or less, a control unit stops a second compressor and controls the volume of a first compressor. Accordingly, it becomes possible to improve COP when the required load is equal to or below 50% as compared to the case of controlling the first and second compressors simultaneously to a low volume.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: March 24, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Kenichi Tamura, Yasuhiro Kondou
  • Publication number: 20150075214
    Abstract: A liquefier for a heat pump includes a liquefier space and a process water tank. The process water tank is arranged within the liquefier space such that it is substantially surrounded by liquefied working fluid. A wall of the process water tank, however, is spaced from a wall of the process water tank so that a gap formed to communicate with the region of the heat pump in which compressed gas is present is obtained, so that the process water tank is thermally insulated from the space for liquefied working fluid via this gas-filled gap. The liquefier itself may also be surrounded by the gas region, in order to provide for inexpensive insulation of the liquefier.
    Type: Application
    Filed: November 20, 2014
    Publication date: March 19, 2015
    Inventors: Holger SEDLAK, Oliver KNIFFLER
  • Patent number: 8973384
    Abstract: To provide a heat pump apparatus, such as a heat pump water heating apparatus, capable of efficiently supplying high-temperature water by increasing a condensation capacity to a maximum if the outside air temperature is low. The heat pump water heating apparatus is configured to include a first refrigeration cycle and a second refrigeration cycle. The first refrigeration cycle is configured to connect in series a main compressor, a first water-refrigerant heat exchanger, an internal heat exchanger, a first pressure reducing device, and an air heat exchanger. The second refrigeration cycle diverges from the first refrigeration cycle between the first water-refrigerant heat exchanger and the first pressure reducing device, and joins the first refrigeration cycle between the main compressor and the first water-refrigerant heat exchanger.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Makoto Saito
  • Patent number: 8966933
    Abstract: A refrigeration apparatus includes a multistage compression mechanism, switching mechanisms, intercoolers, oil separators, and a control unit. The multistage compression mechanism has one high-stage-side compression mechanism and a plurality of low-stage-side compression mechanisms connected in series. The switching mechanisms are connected to blow-out pipes of the low-stage-side compression mechanisms. The switching mechanisms switch between cooling and heating operation cycles. The intercoolers cool refrigerant blown out from the low-stage-side compression mechanisms during the cooling cycle. The oil separators are disposed between the switching mechanisms and the intercoolers. The oil separators separate lubricating oil from refrigerant blown out from the low-stage-side compression mechanisms during the cooling cycle. The control unit controls the multi-stage compression mechanism and the switching mechanisms.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 3, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Tetsuya Okamoto, Kazuhiro Furusho, Ikuhiro Iwata, Guozhong Yang
  • Publication number: 20150052925
    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: Application
    Filed: March 30, 2012
    Publication date: February 26, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenichi Hata, Hiroshi Sata
  • Patent number: 8959951
    Abstract: A refrigerating apparatus, where refrigerant reaches a supercritical state in at least part of a refrigeration cycle, includes at least one expansion mechanism, an evaporator connected to the expansion mechanism, first and second sequential compression elements, a radiator connected to the discharge side of the second compression element, a first refrigerant pipe interconnecting the radiator and the expansion mechanism, a heat exchanger arranged to cause heat exchange between the first refrigerant pipe and another refrigerant pipe. Preferably, a heat exchanger switching mechanism is switchable so that refrigerant flows in the first refrigerant pipe through the first heat exchanger or in a heat exchange bypass pipe connected to the first refrigerant pipe.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: February 24, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Shuji Fujimoto, Atsushi Yoshimi, Takahiro Yamaguchi, Toru Inazuka, Kazuhiro Furusho, Mitsuharu Uchida, Hidehiko Kataoka
  • Publication number: 20150040609
    Abstract: According to one embodiment, an object of the present invention is to provide an outdoor unit of an air conditioner which is basically composed of small-size component parts and can have a large air-conditioning capacity by stacking the small-size component parts in a vertical direction in accordance with a required air-conditioning capacity. The outdoor unit of an air conditioner includes an outdoor heat exchanger, an air-blower assembly including an air exchanger, and a housing accommodating the outdoor heat exchanger and the air-blower assembly. The outdoor heat exchanger, the air-blower assembly and the housing, and another outdoor heat exchanger, another air-blower assembly and another housing are configured to be stackable on each other in a vertical direction.
    Type: Application
    Filed: October 27, 2014
    Publication date: February 12, 2015
    Inventors: Hirofumi YAMAUCHI, Kazuhisa SATO, Hiroyuki NIWA, Takamasa OKUMA
  • Patent number: 8948918
    Abstract: An HVAC controller, a method of operating an HVAC controller and an HVAC system employing the controller or the method. In one embodiment, the HVAC controller includes: (1) a processor couplable to at least two refrigerant pressure sensors via separate data paths to receive input signals therefrom and further couplable to a compressor stage and a condenser fan to provide output signals thereto and (2) memory coupled to the processor and configured to store a software program capable of causing the processor to command the compressor stage and the condenser fan to turn on irrespective of a state of an input signal generated by either of the at least two refrigerant pressure sensors and generate alternative error messages at least partially depending upon whether or not a high pressure shutdown occurs after the processor commands the compressor stage and the fan to turn on.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: February 3, 2015
    Assignee: Lennox Industries Inc.
    Inventors: Carlos O. Chamorro, Roger C. Hundt, John P. Stachler, Stephen A. Walter
  • Patent number: 8935928
    Abstract: An integrated power and refrigeration system is disclosed that includes a first subsystem configured to provide cooling air using a reverse-Brayton cycle using compressed air and a second subsystem configured to provide power by accepting a first portion of the compressed air from the first subsystem, heating the accepted first portion of the compressed air to form hot compressed air, and using the hot compressed air to drive a turbine that is coupled to a power generator.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: January 20, 2015
    Assignee: Lockheed Martin Corporation
    Inventor: Frank Mills
  • Patent number: 8931304
    Abstract: An example compressor arrangement includes a first compressor portion configured to compress a fluid and a second compressor portion configured to compress the fluid more than the first compressor portion. The compressor arrangement also includes a motor disposed between the first compressor portion and the second compressor portion. The first compressor portion is configured to communicate the fluid to the second compressor portion along a primary flow path. The second compressor portion is configured to divert at least some of the fluid from the primary flow path, communicating the diverted fluid back to the first compressor portion along a secondary flow path.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: January 13, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Craig M. Beers, Christopher McAuliffe
  • Publication number: 20150007598
    Abstract: A cooling system and a control method thereof are provided. The cooling system may include a first compressor, a second compressor disposed downstream of the first compressor, an outdoor heat exchanger the performs heat exchange between refrigerant compressed in the first and/or second compressor and external air, an expansion device that decompresses the refrigerant condensed in the outdoor heat exchanger, a cooling evaporator evaporating the refrigerant decompressed in the expansion device, a bypass tube that guides refrigerant compressed in the first compressor to the outdoor heat exchanger, bypassing the second compressor, and a valve device controlling the flow of refrigerant discharged from the first compressor so as to selectively introduce refrigerant into the second compressor.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 8, 2015
    Applicant: LG ELECTRONICS INC.
    Inventors: Jaeheuk CHOI, Taehee KWAK, Yoonho YOO, Doyong HA
  • Publication number: 20140366563
    Abstract: A cooling system includes a heat exchanger through which a refrigerant flows, and which rejects heat to a fluid, an evaporator, a first circuit having an expansion device, a second circuit having an expansion machine coupled to a compressor, and a set of valves arranged to direct the refrigerant through the first circuit, the second circuit, or both the first and second circuits based on ambient conditions.
    Type: Application
    Filed: December 17, 2013
    Publication date: December 18, 2014
    Applicants: Rolls-Royce North American Technologies, Inc., Rolls-Royce Corporation
    Inventors: Igor Vaisman, Patrick C. Sweeney, Douglas J. Snyder
  • Publication number: 20140371919
    Abstract: A centrifugal compressor for compressing a refrigerant vapour in a refrigeration cycle. The compressor comprises an impeller drive shaft (28) supported by first and second radial bearings (32) for rotation within the compressor housing and an impeller assembly including at least one centrifugal impeller wheel mounted on the impeller drive shaft to rotate with the impeller drive shaft. The first and second radial bearings are hydrodynamic fluid bearings in which the bearing fluid is the refrigerant vapour. The compressor further comprising a conduit (36) for supplying a portion of the refrigerant vapour from the impeller assembly to the first and second fluid bearings.
    Type: Application
    Filed: December 20, 2012
    Publication date: December 18, 2014
    Inventor: Michael Creamer
  • Publication number: 20140345308
    Abstract: A refrigeration system including a first compressor and a second compressor, operating in tandem, wherein the first compressor includes a compression capacity different than the compression capacity of the second compressor. A method for operating a refrigeration system including a first compressor and a second compressor operating in tandem; wherein the first compressor comprises a first compression capacity and the second compressor comprises a second compression capacity larger than the first compression capacity the method comprising the steps of: determining a cooling demand; operating the first compressor in a first stage of cooling; operating the second compressor in a second stage of cooling; and operating the first compressor and the second compressor in a third stage of cooling.
    Type: Application
    Filed: April 29, 2014
    Publication date: November 27, 2014
    Applicant: CARRIER CORPORATION
    Inventors: James J. Del Toro, James E. Harris, Marco A. Quiroz, Benjamen D. Baker, Andrew M. Ramser
  • Patent number: 8881541
    Abstract: A cooling system has a tandem compressor, a condenser, an electronic expansion valve and an evaporator arranged in a direct expansion cooling circuit. The tandem compressor includes a variable capacity compressor and a fixed capacity compressor. A controller controls the electronic expansion valve and selects which of a plurality of superheat control modes to use in operating the electronic expansion valve based on control parameters and a current operating status of each of the variable capacity compressor and fixed capacity compressor of the tandem compressor.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: November 11, 2014
    Assignee: Liebert Corporation
    Inventors: Roger Noll, Gary A. Helmink, Pierpaolo Barbato, Giuseppe Dalla Mana, Lou Monnier
  • Publication number: 20140326018
    Abstract: A system may include first and second compressors and first, second and third heat exchangers. The first heat exchanger may receive working fluid discharged from the first and second compressors. The second heat exchanger may be disposed downstream of the first heat exchanger and may provide working fluid to the first compressor. The third heat exchanger may be disposed between the first and second heat exchangers and may include an inlet and first and second outlets. The first outlet may provide working fluid to the second heat exchanger. The second outlet may provide working fluid to the second compressor.
    Type: Application
    Filed: May 1, 2014
    Publication date: November 6, 2014
    Applicant: Emerson Climate Technologies, Inc.
    Inventor: Kirill M. IGNATIEV
  • Publication number: 20140318171
    Abstract: A heat pump unit (1) comprises at least one main circuit (2) adapted to perform a main heat pump cycle with a respective operating fluid, which comprises: a main condenser (S4) adapted to perform the condensation of the operating fluid of the main heat pump cycle and intended to be connected to an external circuit of a first thermal user plant (10) in a heating operating mode of said heat pump unit (1), a first heat exchanger (S2), connected downstream of the main condenser (S4) and upstream of expansion means (L2) of said the main circuit (2), adapted to perform an undercooling of the operating fluid of the main heat pump cycle after the condensation of the same in the main condenser (S4), and a main evaporator (S8) adapted to perform the evaporation of the operating fluid of the main heat pump cycle and intended to be connected to an external circuit of a heat sink (20) in a heating operating mode of said heat pump unit (1).
    Type: Application
    Filed: December 12, 2012
    Publication date: October 30, 2014
    Applicant: STP S.R.L.
    Inventor: Gianfranco Pellegrini
  • Patent number: 8863534
    Abstract: A transport refrigeration system with a direct drive compressor arrangement is provided with a variable speed electrically driven booster compressor that operates in series with the direct drive compressor. The speed of the booster compressor is controlled to either boost or decrease the system capacity. The booster compressor also acts to regulate the flow of refrigerant from the evaporator during periods of operation in which the direct drive compressor might otherwise become overloaded.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: October 21, 2014
    Assignee: Carrier Corporation
    Inventor: Richard T Pandzik
  • 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: 8844318
    Abstract: A coaxial economizer for use in a chiller system comprising an inner housing and an outer housing having a common longitudinal axis. The outer housing has an inlet for receiving a fluid from a upstream compressor stage of a multistage compressor and an outlet for conveying a fluid to a downstream compressor stage of a multistage compressor. A flow chamber forms a fluid flow path about the inner housing. A flash chamber is coterminous with the flow chamber and flashes fluid in a liquid state to a gas state. A flow passage between said flash chamber and the flow chamber for conveying a flashed gas from the flash chamber to the flow chamber; wherein the flashed gas conveyed from the flash chamber and the fluid received from the inlet of the outer housing mix along the fluid flow path toward the outlet of the outer housing.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: September 30, 2014
    Assignee: Trane International Inc.
    Inventors: Rick T. James, Paul F. Haley, Randall L. Janssen, William J. Plzak
  • Publication number: 20140260341
    Abstract: A cooling system includes a first heat exchanger, an evaporator coupled to a thermal load of an aircraft. first and second cooling circuits coupled to the heat exchanger, the first and second cooling circuits selectable via a set of cooling circuit valves that are arranged to direct a refrigerant through the first circuit, the second circuit, or both the first and second circuits based on air passing through the first heat exchanger at ambient conditions of the aircraft, and a receiver configured to accumulate reserve refrigerant to provide flexibility in system operation as the cooling system operates in sub-critical, trans-critical, and super-critical modes of operation.
    Type: Application
    Filed: December 30, 2013
    Publication date: September 18, 2014
    Applicants: Rolls-Royce North American Technologies, Inc., Rolls-Royce Corporation
    Inventors: Igor Vaisman, Patrick C. Sweeney
  • Publication number: 20140260391
    Abstract: A system for cooling air for use with a liquid cooling fluid loop. The system includes a first refrigerant circuit with an air-cooled condenser, a second refrigerant circuit with a liquid-cooled condenser, and a free-cooling loop. A control device is provided for controlling the operation of the system between a first mode, a second mode, and a third mode. When operating in the first mode, only the free-cooling loop cooperates directly with liquid cooling fluid in the liquid cooling fluid loop to cool the liquid cooling fluid, when operating in the second mode, the second refrigerant circuit is not engaged, and when operating in the third mode, the free-cooling loop interacts with the second refrigerant circuit to reject heat of the second refrigerant circuit through the free-cooling loop.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: JOHNSON CONTROLS TECHNOLOGY COMPANY
    Inventor: William L. KOPKO
  • Patent number: 8826691
    Abstract: An air conditioner includes at least one compressor, an outlet pipe, an inlet pipe, and at least one bypass pipe. Oil and/or refrigerant discharged from the at least one compressor flows through the outlet pipe. The inlet pipe receives the oil and/or refrigerant flown through the outlet pipe and allows the oil and/or refrigerant to flow to the at least one compressor. The at least one bypass pipe is connected to the at least one compressor and allow bypass flows of the oil and/or refrigerant from the at least one compressor to the outlet pipe.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: September 9, 2014
    Assignee: LG Electronics Inc.
    Inventors: Pil Hyun Yoon, Sai Kee Oh
  • Publication number: 20140245763
    Abstract: A fluid circuit in a high-temperature heat pump absorbs thermal energy through the fluid from at least a first reservoir while performing technical work and outputs thermal energy through the fluid to at least a second reservoir, thereby heating the at least one second reservoir. The working medium may be hydrofluoroether or fluoroketone.
    Type: Application
    Filed: September 21, 2012
    Publication date: September 4, 2014
    Inventors: Bernd Grommoll, Jochen Schäfer
  • Patent number: 8820103
    Abstract: An air conditioner includes a plurality of compressors, an intake passageway, a bypass unit, and an expansion valve. The intake passageway distributes a fluid to each of the compressors. The bypass unit includes a plurality of bypass pipes connected respectively to the compressors and a common bypass pipe to discharge the fluids from the compressors to the intake passageway. The expansion valve is provided to the bypass unit to control a flow of fluid from the common bypass pipe to the intake unit.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: September 2, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hojong Jeong, Sedong Chang, Baikyoung Chung, Jiyoung Jang
  • Patent number: 8806888
    Abstract: An air conditioning system includes a phase separator separating a gaseous refrigerant and a liquid refrigerant from a flowing refrigerant, an evaporator evaporating the liquid refrigerant separated by the phase separator, and at least one compressor including a first compressing part receiving the refrigerant via the evaporator and a second compressing part receiving both of the gaseous refrigerant separated by the phase separator and the refrigerant via the first compressing part.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: August 19, 2014
    Assignee: LG Electronics Inc.
    Inventors: Young Hwan Ko, Hyuk Soo Lee, Bum Suk Kim, Sang Kyoung Park, Byung Soon Kim
  • Patent number: 8800310
    Abstract: A turbo compressor to suction and compress gas includes a housing including a flow passageway through which gas flows, an impeller disposed inside the flow passageway, the impeller providing suction for the gas by being rotationally driven, a liquid discharge port provided in the flow passageway on the upstream side of the impeller, the liquid discharge port discharging, from the flow passageway, any liquid produced as the gas liquefies when the turbo compressor is stopped, a liquid discharge pipe connected to the liquid discharge port, an electromagnetic valve connected to the liquid discharge pipe, and a controller configured to open the electromagnetic valve before the impeller is rotationally driven. A refrigerator includes the turbo compressor, wherein the turbo compressor compresses refrigerant gas.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: August 12, 2014
    Assignee: IHI Corporation
    Inventor: Noriyasu Sugitani
  • Publication number: 20140202202
    Abstract: A centrifugal compressor (1) includes: an impeller (2) having full blades (21) and splitter blades (22); a shroud wall (3) forming an intake (12) and having a shape conforming to the impeller (2); and a bleed chamber (4) facing an outer surface of the shroud wall (3). The bleed chamber (4) communicates with a discharge space having a pressure equal to or lower than a pressure of a working fluid at the intake (12). The shroud wall (3) is provided with a slit (32) (a bleeding passage) that directs a portion of the working fluid that has flowed into a space between the full blade (21) and a pressurizing surface of the splitter blade (22) to the bleed chamber (4).
    Type: Application
    Filed: March 22, 2013
    Publication date: July 24, 2014
    Inventors: Hidetoshi Taguchi, Fumitoshi Nishiwaki, Kou Komori
  • Patent number: 8769982
    Abstract: A refrigeration system can use a flash tank to separate vapor refrigerant from liquid refrigerant. The refrigeration system can include a liquid-refrigerant injection system that can inject liquid refrigerant into an intermediate-pressure location of the compressor. The injected liquid refrigerant can absorb the heat of compression during the compression process. The refrigeration system can include an economizer system that injects a refrigerant vapor into an intermediate-pressure location of the compressor in conjunction with the injection of the cooling liquid. The refrigeration system can incorporate a cooling-liquid injection system that can inject a cooling liquid into an intermediate-pressure location of the compressor.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: July 8, 2014
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Kirill Ignatiev, Jean-Luc M. Caillat
  • Patent number: 8769983
    Abstract: The present invention provides a refrigeration cycle apparatus using a first compressor and a second compressor driven by an expander and including a high and low pressure heat exchanger, in which a low-pressure-side outlet of the high and low pressure heat exchanger is bypassed to a low pressure portion or an intermediate pressure portion to adjust an inlet density at the expander and thereby provide high efficiency. The high and low pressure heat exchanger of the refrigeration cycle apparatus of the present invention changes an amount of heat exchange between a high-pressure refrigerant and a reduced-pressure refrigerant branched from the high-pressure refrigerant at an inlet portion of the high and low pressure heat exchanger and reduced in pressure to adjust the density of the refrigerant flowing in the expander so that power recovered by the expander and power required by the second compressor match.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: July 8, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Takashi Okazaki
  • Patent number: 8763425
    Abstract: A turbo compressor includes: multiple stages of compression devices arranged in series with respect to a gas passage, each of the compression devices including an impeller that rotates about an axis; an oil tank capable of supplying lubricating oil to a sliding portion of the compression devices; a partitioned intermediate space formed to communicate with the gas passage on an upstream side of the compression devices via gaps between the partitioned intermediate space and the gas passage; and a pressure equalizer provided to continuously connect the partitioned intermediate space and the oil tank.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: July 1, 2014
    Assignee: IHI Corporation
    Inventor: Noriyasu Sugitani