Bypass, E.g., Compressor Unloading Patents (Class 62/196.1)
  • Patent number: 10551106
    Abstract: In certain embodiments, a refrigeration system comprises an emergency electric power supply configured to supply power to at least one motor drive of the system. The system comprises a power switch coupled to the emergency electric power supply, a tank configured to store a refrigerant, a first compressor configured to compress the refrigerant of the tank, and a controller coupled to the power switch and first compressor. The controller may receive an indication from the power switch that the system is using the emergency electric power supply, and in response to receiving the indication from the power switch that the system is using the emergency electric power supply, operate the system in a first power outage mode. The controller may determine an amount of power to supply to the first compressor based on the first power outage mode and transmit a signal to instruct the first compressor to turn on.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: February 4, 2020
    Assignee: Heatcraft Refrigeration Products LLC
    Inventors: Steven C. Pfister, Douglas Samuel Cole
  • Patent number: 10527322
    Abstract: Provided is a air conditioner including high-and-low-pressure gas pipe expansion valves each of which is provided to a corresponding one of the cooling-heating switching units and adjusts feeding of high-temperature and high-pressure gas refrigerant to the corresponding indoor unit; and a refrigeration cycle controller which adjusts a valve opening degree of the high-and-low-pressure gas pipe expansion valve of the cooling-heating switching unit connected to one of the indoor units which is not in heating operation, in accordance with a determination result on excess or deficiency of refrigerant in a refrigeration cycle.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: January 7, 2020
    Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.
    Inventors: Koji Naito, Kazumoto Urata, Kazuhiko Tani, Masayoshi Murofushi, Gen Yasuda
  • Patent number: 10473364
    Abstract: A heat pump system comprises a compressor, a first heat exchanger, a second heat exchanger, a mode switching valve, a throttling element and a reservoir, wherein the throttling element is arranged on a flow path between the first heat exchanger and the second heat exchanger; and which further comprises a mode switching flow path in which a first flow path and a second flow path are arranged, the reservoir is arranged on the second flow path and each flow path is controllably opened or closed to realize different functional modes.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: November 12, 2019
    Assignee: CARRIER CORPORATION
    Inventors: Weijuan Wang, Haijun Li, Guangyu Shen, Yingzheng Fu
  • Patent number: 10458314
    Abstract: The present disclosure provides a hybrid intercooler system integrated with an air conditioning system and a method of controlling the same. In accordance with the present disclosure, it is possible to stabilize the temperature of intake air passing through the inlet of an intercooler using a water cooling unit and increase the cooling efficiency of the intercooler using an air cooling unit. Consequently, it is possible to improve engine power and fuel efficiency.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: October 29, 2019
    Assignee: HYUNDAI MOTOR COMPANY
    Inventor: Dang-Hee Park
  • Patent number: 10234158
    Abstract: A controller controls a first air-conditioning system and a second air-conditioning system having separate refrigerant circuits, but arranged for conditioning a common space. The controller includes a multi-variable regulator to determine control signals for controlling operations of first components of the first and the second refrigerant circuits to reduce jointly and concurrently an environmental error between setpoint and measured values of environment in the common space. The controller also includes at least two single-variable regulators to receive operational errors between setpoint and measured values of an operation of a second component of the first and the second refrigerant circuits. The controller separately determines control signals for controlling the operation of different refrigerant circuits that reduce the operational errors.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: March 19, 2019
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Christopher R. Laughman, Hongtao Qiao, Daniel Burns, Scott A Bortoff
  • Patent number: 10183551
    Abstract: A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: January 22, 2019
    Assignee: SANDEN HOLDINGS CORPORATION
    Inventors: Kenichi Suzuki, Atsuo Inoue, Hidenori Takei
  • Patent number: 10107534
    Abstract: A pipe mounting structure of an embodiment allows a pipe, which is connected to an outlet side of an evaporator, to be mounted on a second passage of an expansion valve in such a manner that the pipe is inserted into an inlet port, and allows a pipe, which is connected to an inlet side of a compressor, to be mounted on the second passage in such a manner that the pipe is inserted into an outlet port. These pipes are mounted so that the pipes face each other with a shaft therebetween. The pipe mounting structure includes a natural vibration suppressing structure configured to prevent or suppress natural vibration of a gas column having antinodes of a standing wave at an open end of one of the pipes and an open end of the other pipe.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: October 23, 2018
    Assignee: TGK CO., LTD.
    Inventors: Takanao Kumakura, Takeshi Kaneko, Ryosuke Satake, Shinji Saeki, Takeshi Watanabe, Takafumi Jyonouchi
  • Patent number: 10088206
    Abstract: An air-conditioning apparatus controls a decrease in efficiency of a refrigeration cycle, and includes a suction pipe having one end connected to a suction side of a compressor and an other end connected to an evaporator, a receiver connected to a refrigerant pipe connecting the evaporator and a condenser to each other, a first bypass pipe having one end connected to the receiver and an other end connected to the suction pipe and configured to supply refrigerant from the receiver to the suction pipe, a flow control valve provided to the first bypass pipe, a heat recovery portion disposed downstream of a portion of the suction pipe connected to the first bypass pipe, and a control device configured to control an opening degree of the flow control valve based on a degree of superheat of refrigerant in the heat recovery portion.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: October 2, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mizuo Sakai, Masanori Aoki, Hirokuni Shiba, Hiroaki Nakamune, Hiroki Murakami
  • Patent number: 10024314
    Abstract: A control system for a rod pumping unit is disclosed herein. The control system includes a memory device, a sensor, and a processor. The memory device is configured to store a velocity profile for controlling a sucker rod string of the rod pumping unit. The sensor is configured to take measurements for determining surface load of the sucker rod string. The processor is configured to gain access to the memory device and the velocity profile. The processor is further configured to determine a reference force. The processor is further configured to receive a measurement from the sensor and determine the surface load. The processor is further configured to compute a desired velocity for commanding the rod pumping unit. The desired velocity is computed based on a reference velocity from the velocity profile, the reference force, and the surface load.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: July 17, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Shyam Sivaramakrishnan, Kalpesh Singal, David Warren Doyle, Fatemeh Zamanian
  • Patent number: 9995517
    Abstract: An operation control apparatus of air-conditioning apparatus having an outdoor unit and an indoor unit includes a controller programmed to execute energy conservation control of the air conditioning apparatus. The controller includes at least one required temperature calculation part calculating a required evaporation temperature or a required condensation temperature based on either a current amount of heat exchanged in a usage-side heat exchanger of the indoor unit and a greater amount of heat exchanged in the usage-side heat exchanger than the current amount, or an operating state amount that yields the current amount of heat exchanged in the usage-side heat exchanger and an operating state amount that yields the greater amount of heat exchanged in the usage-side heat exchanger than the current amount.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: June 12, 2018
    Assignee: Daikin Industries, Ltd.
    Inventors: Kousuke Kibo, Kazuhiko Tani, Masahiro Oka, Shinichi Kasahara, Yasuyuki Aisaka, Shingo Ohnishi
  • Patent number: 9964348
    Abstract: A system includes a temperature sensor, a pressure sensor, and a controller. The temperature sensor measures a temperature of a refrigerant at a compressor. The compressor receives the refrigerant from a second compressor. The pressure sensor measures a pressure of the refrigerant at the compressor. The controller receives one or more of the measured temperature and the measured pressure and determines that one or more of the measured temperature and the measured pressure exceed a threshold. In response to that determination, the controller actuates a pulse valve coupled to a liquid injection line. The pulse valve controls the flow of a liquid refrigerant from a flash tank through the liquid injection line to mix with the refrigerant at the compressor.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: May 8, 2018
    Assignee: Heatcraft Refrigeration Products LLC
    Inventors: Masood Ali, Augusto J. Pereira Zimmermann
  • Patent number: 9956847
    Abstract: A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: May 1, 2018
    Assignee: SANDEN HOLDINGS CORPORATION
    Inventors: Kenichi Suzuki, Atsuo Inoue, Hidenori Takei
  • Patent number: 9937771
    Abstract: A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: April 10, 2018
    Assignee: SANDEN HOLDINGS CORPORATION
    Inventors: Kenichi Suzuki, Atsuo Inoue, Hidenori Takei
  • Patent number: 9926811
    Abstract: Systems and methods for controlling a heat engine system are provided. One method includes initiating flow of a working fluid through a working fluid circuit having a high pressure side and a low pressure side by controlling a pump to pressurize and circulate the working fluid through the working fluid circuit and determining a configuration of the working fluid circuit by determining which of a plurality of waste heat exchangers and which of a plurality of recuperators to position in the high pressure side of the working fluid circuit. The method also includes determining, based on the determined configuration of the working fluid circuit, for each of a plurality of valves, whether to position each respective valve in an opened position, a closed position, or a partially opened position and actuating each of the plurality of valves to the determined opened position, closed position, or partially opened position.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: March 27, 2018
    Assignee: Echogen Power Systems, LLC
    Inventors: Joshua Giegel, Timothy Held, Brett Bowan, Cameron Close
  • Patent number: 9869501
    Abstract: An air-conditioning apparatus includes: a first bypass pipe connected to an inlet-side passage of an accumulator through a second expansion device, a second passage of a subcooling heat exchanger, and a first opening and closing device; a second bypass pipe branched from the first bypass pipe between the subcooling heat exchanger and the first opening and closing device and connected to an injection port of a compressor through a second opening and closing device; and a third bypass pipe branched from a refrigerant pipe between a heat source-side heat exchanger and a use-side heat exchanger and connected to the second bypass pipe between the second opening and closing device and the injection port of the compressor through a third expansion device.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: January 16, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Koji Yamashita
  • Patent number: 9851141
    Abstract: A method is provided for operating a system for the liquefaction of gas of the type comprising a main heat exchange vessel, a bundle for the gas to be liquefied extending through said MCHE and a refrigerant compression circuit of which a first end leads evaporated refrigerant from the vessel towards a compressor and a second end supplies the compressed and cooled refrigerant from the compressor towards the MCHE. For avoiding problems during heat up or during start up of the heat exchanger the pressure within the liquefaction system is controlled by regulating the amount of evaporated refrigerant in the liquefaction circuit.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: December 26, 2017
    Assignee: BLUEWATER ENERGY SERVICES B.V.
    Inventors: Pieter Cornelis Burger, Clemens Gerardus Johannes Maria Van Der Nat, Jozefus Gerardus Petrus Vernooij
  • Patent number: 9835346
    Abstract: The present disclosure provides an air conditioner. The air conditioner includes a compressor; a sensor for measuring the compressors state configured to detect compressor state information that includes at least one of a pressure value and a saturation temperature of the compressor; and a controller configured to control air flow on the side of an indoor unit by comparing the compressor state information measured from the sensor and a threshold.
    Type: Grant
    Filed: March 6, 2015
    Date of Patent: December 5, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Kyung Hoon Kim, Se-Won Kim, Byoung Guk Lim, Il Yong Cho
  • Patent number: 9791194
    Abstract: An air-conditioning apparatus is capable of completing heat medium freeze prevention control more quickly by performing heat medium temperature rise control for raising the temperature of a cooled heat medium and includes a controller that adjusts a current opening degree of a bypass device at a bypass pipe to an opening degree, and that makes an adjustment such that the flow passage resistance in the case of the opening degree becomes equal to the flow passage resistance in the case of an opening degree before an expansion device is adjusted to a minimum opening degree.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: October 17, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Takayama, Koji Azuma, Yuji Motomura, Takeshi Hatomura
  • Patent number: 9732663
    Abstract: A cooling system for cooling a hybrid vehicle apparatus includes a compressor that circulates a refrigerant, a first heat exchanger that carries out heat exchange between the refrigerant and outside air, an expansion valve that reduces the pressure of the refrigerant, a second heat exchanger that carries out heat exchange between the refrigerant and air-conditioning air, a cooling portion that cools the hybrid vehicle apparatus using the refrigerant that flows between the heat exchanger and the expansion valve, a gas-liquid separator that separates the refrigerant that flows between the heat exchanger and the cooling portion into a liquid-phase refrigerant and a gas-phase refrigerant, and a liquid accumulator that is provided between the gas-liquid separator and the cooling portion, and that retains the liquid-phase refrigerant separated by the gas-liquid separator.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: August 15, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshiaki Kawakami, Yuki Jojima, Eizo Takahashi, Kousuke Sato, Yuichi Ohno, Kazuhide Uchida
  • Patent number: 9618241
    Abstract: An air-conditioning apparatus controls that a discharge temperature does not become too high with a refrigerant whose compressor discharge temperature readily rises, and thus suppress degradation of the refrigerant and a refrigerating machine oil. An injection pipe that injects a heat source side refrigerant into a compressor is installed, connected a pipe between a backflow prevention device and an opening and closing device installed on a branching pipe, and an aperture unit in the compressor.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: April 11, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Yamashita, Hiroyuki Morimoto, Katsuhiro Ishimura, Shinichi Wakamoto, Naofumi Takenaka
  • Patent number: 9612042
    Abstract: A refrigeration system having a cooling circuit, a heating circuit, a pressurizing receiver tank circuit, a pilot circuit and a liquid injection circuit wherein the hot gas line includes a solenoid valve that connects an outlet of a compressor to an outlet of a receiver tank, and wherein the liquid injection circuit includes a liquid injection solenoid that connects the outlet of the receiver tank to an outlet of an economizer.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: April 4, 2017
    Assignee: THERMO KING CORPORATION
    Inventors: Lars I. Sjoholm, Peter W. Freund, P. Robert Srichai, Jeffrey B. Gronneberg
  • Patent number: 9603380
    Abstract: A refrigerant container, which is in particular suitable for use in a cooling system designed for operation with a two-phase refrigerant, includes a receiving space for receiving a refrigerant that is disposed in an interior of the refrigerant container. Disposed in the receiving space of the refrigerant container is a heat exchanger allowing passage of a further refrigerant therethrough and being configured to remove heat from refrigerant in the liquid and/or gaseous state of aggregation that is received in the receiving space in order to supercool the refrigerant and/or convert the refrigerant to the liquid state of aggregation.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: March 28, 2017
    Assignee: AIRBUS OPERATIONS GmbH
    Inventor: Markus Piesker
  • Patent number: 9605885
    Abstract: An air conditioning system includes: first and second utilization side heat exchangers and a heat source side heat exchanger respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger. The bypass valve provides a variable amount of liquid refrigerant flowing from the expansion valve to the heat source side heat exchanger. The pressure control device and the bypass valve cooperate with each other to keep a temperature of the compressor below a maximum allowable temperature predetermined for the compressor.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kensaku Hatanaka, Kazuyoshi Shinozaki, Joseph Paul Bush, Peter Christian Flynn
  • Patent number: 9587863
    Abstract: A refrigeration apparatus uses R32 as refrigerant, and includes a compressor, a condenser, an expansion mechanism, an evaporator, a branch flow channel branching from a main refrigerant channel joining the condenser and the evaporator, a first opening adjustable valve disposed along the branch flow channel, an injection heat exchanger, a first injection channel, a refrigerant storage tank disposed along the main refrigerant channel, and a second injection channel. The injection heat exchanger exchanges heat between refrigerant in the main refrigerant channel and refrigerant passing through the first opening adjustable valve. The first injection channel guides refrigerant that flows in the branch flow channel and that exits from the injection heat exchanger to the compressor or the suction passage. The second injection channel guides a gas component of refrigerant accumulated inside the refrigerant storage tank to the compressor or the suction passage.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: March 7, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Satoshi Kawano, Shinya Matsuoka, Masahiro Oka
  • Patent number: 9574805
    Abstract: A method and apparatus for controlling temperature of a compressor motor (170) having a motor cooling circuit in a refrigeration system (1014) is provided. The motor cooling circuit includes a second expansion valve (1043) providing fluid communication between the condenser and the compressor motor. The compressor motor (170) is in fluid communication with the refrigeration circuit (1014) between downstream of the first expansion valve (1040) and a compressor inlet. Refrigerant is provided as a cooling fluid to the motor cooling circuit. A primary PID loop (402) and a secondary PID loop (414) are used to control the temperature and the flow of refrigerant to the motor (170).
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: February 21, 2017
    Assignee: Johnson Controls Technology Company
    Inventors: Liming Yang, Curtis Christian Crane
  • Patent number: 9440839
    Abstract: A cooling system for a beverage comprises an enclosure for housing a beverage container, a cold plate through which the beverage flows, and a refrigeration system that controllably cools the enclosure and the cold plate in a differential manner. In preferred embodiments, preference is given during normal operation to cooling the cold plate, and only cooling the enclosure when the cold plate is determined to be at or below a desired temperature. In some embodiments a special defrost cycle warms the cold plate while continuing to cool the enclosure. Controls can be mechanical, electronic or any combination of the two, and preferably utilizes information from both pressure and temperature sensors.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: September 13, 2016
    Assignee: Cleland Sales Corporation
    Inventors: James M. Cleland, Adam Cleland
  • Patent number: 9410709
    Abstract: A chiller including a condenser having a refrigerant-storage vessel in fluid communication with a multichannel heat exchanger is disclosed. The chiller further includes a compressor, an evaporator and an expansion device connected in a refrigerant circuit. The refrigerant-storage vessel provides system volume for pump down operations.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: August 9, 2016
    Assignee: Johnson Controls Technology Company
    Inventors: William L. Kopko, Jose Ruel Yalung De La Cruz
  • Patent number: 9341401
    Abstract: Provided is a heat source system that includes two heat source devices connected in series to a heat medium and can be efficiently operated. A heat source system (1) reduces the temperature of chilled water that is guided from a cooling load and has a predetermined return temperature Tr, to a predetermined supply temperature Ts, and supplies the chilled water to the cooling load. The heat source system (1) includes: a second centrifugal chiller (TR2) that reduces the temperature of the chilled water from the return temperature Tr to an intermediate temperature T2; a first centrifugal chiller (TR1) that reduces the temperature of the chilled water that has been reduced to the intermediate temperature T2 by the second centrifugal chiller (TR2), to the supply temperature Ts; and a control unit (9) that variably sets the intermediate temperature T2.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: May 17, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Satoshi Nikaido, Kazuki Wajima, Akimasa Yokoyama, Masanobu Sakai
  • Patent number: 9233594
    Abstract: A cooling device utilizes a vapor compression refrigeration cycle including a compressor, a condenser, a receiver, an expansion valve, an evaporator, and an accumulator to cool a heat source with a coolant. The receiver separates the coolant having been subjected to heat exchange by the condenser into gas and liquid. The accumulator separates the coolant having been subjected to heat exchange by the evaporator into gas and liquid. The cooling device opens a switch valve capable of bringing the receiver and the accumulator into communication with each other to move the coolant liquid in the accumulator to the receiver. The cooling device restores the pressure difference between the receiver and the accumulator after the movement of the coolant liquid to the pressure difference before the movement of the coolant liquid by a pressure regulating unit.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: January 12, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kunihiko Arai, Yoshiaki Kawakami
  • Patent number: 9228765
    Abstract: A refrigeration cycle device includes a first refrigerant passage in which a compressor, a first solenoid valve, a four-way valve, an outdoor heat exchanger, a pressure reducing device, an indoor heat exchanger, and an accumulator are sequentially connected through pipes; a second refrigerant passage in which a second solenoid valve and a water refrigerant heat exchanger are sequentially connected to a pipe that connects a portion of a pipe between the compressor and the first solenoid valve to the pressure reducing device; heating means for heating a shell of the compressor; and a controller that performs control so as to close the first solenoid valve and the second solenoid valve in association with an operation of the compressor being stopped and so as to open the first solenoid valve when the heating means heats the compressor.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: January 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Ryo Oya
  • Patent number: 9217592
    Abstract: A refrigeration system includes a compressor, a condenser, an expansion device, an evaporator, and an additional refrigerant vessel connected in a closed refrigerant loop. The additional refrigerant vessel is connected to the condenser at the high pressure side by a first valve and to the evaporator at a low pressure side by a second valve. A controller controls operation of the first valve and the second valve. Only one of the first valve and the second valve may be open at the same time. Refrigerant from the additional refrigerant vessel may be added to the closed refrigerant loop when the controller receives a low refrigerant level indication of in the evaporator. Refrigerant may also be removed from the closed refrigerant loop when the controller receives a high refrigerant level indication in the evaporator.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: December 22, 2015
    Assignee: Johnson Controls Technology Company
    Inventors: Robert D. Turney, Justin P. Kauffman, Kirk H. Drees, Homero Noboa, Brett M. Lenhardt
  • Patent number: 9086070
    Abstract: The invention relates to improvements in compressors and, in particular, to improvements in a method of controlling centrifugal compressors to maximize their efficacy. The compressor has an impeller mounted on a shaft supported by an active magnetic bearing unit and is driven by a variable speed motor at a rotational speed under normal on-load conditions at a calculated pre-surge speed for the required delivery pressure. The actual rotational speed and delivery pressure of the compressor is repeatedly measured and recorded at high frequency. The compressor is allowed to surge periodically after a preset re-calibration time and the compressor is put into a surge recovery cycle when surge is detected, during which the compressor is off-loaded and the rotational speed reduced.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: July 21, 2015
    Assignee: GARDNER DENVER DEUTSCHLAND GMBH
    Inventor: Geoffrey George Powell
  • Publication number: 20150135751
    Abstract: The air-conditioning apparatus includes a compressor; a heat source side heat exchanger; a use side pressure-reducing mechanism; a use side heat exchanger and an accumulator connected by a pipe so that a refrigerant circulates therethrough; a high-low pressure bypass pipe; a high-low pressure bypass unit installed in the high-low pressure bypass pipe; and a unit controller configured to perform a refrigerant amount detection operation in which an operation frequency of the compressor is controlled so that a value of an evaporating temperature becomes an evaporating temperature target value of the compressor to discharge a liquid-state refrigerant of the refrigerant from the accumulator, and control an opening degree of the high-low pressure bypass unit in performing the refrigerant amount detection operation.
    Type: Application
    Filed: November 20, 2013
    Publication date: May 21, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shogo TAMAKI, Kazuyoshi SHINOZAKI
  • Patent number: 9003818
    Abstract: A heat pump-type hot water supply apparatus may be provided that includes: a refrigeration cycle circuit (including a compressor, an outdoor heat exchanger, expansion devices, and an indoor heat exchanger); a hot water supply heat exchanger connected to the refrigeration cycle circuit to use the first refrigerant discharged from the compressor for a hot water supply; a cascade heat exchanger connected to the refrigeration cycle circuit to allow the first refrigerant passing through the hot water supply heat exchanger to evaporate a second refrigerant and thereafter, to be condensed, expanded, and evaporated in the refrigeration cycle circuit; a heat storage compressor compressing the second refrigerant evaporated in the cascade heat exchanger, a heat storage tank to heat water using the second refrigerant compressed by the heat storage compressor, and a heat storage expansion device to expand the second refrigerant condensed in the heat storage tank.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: April 14, 2015
    Assignee: LG Electronics Inc.
    Inventors: Hwanjong Choi, Noma Park, Heewoong Park
  • Patent number: 8984903
    Abstract: A refrigerant cycle device includes a first refrigerant passage for guiding refrigerant from a refrigerant radiator to an inlet side of an outdoor heat exchanger, a first throttle part capable of varying an opening area of the first refrigerant passage, a second refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to a compressor-suction side, a first opening/closing part for opening/closing the second refrigerant passage, a third refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to the compressor-suction side via an evaporator, a second throttle part capable of varying an opening area of the third refrigerant passage, a bypass passage for guiding the refrigerant flowing between the refrigerant radiator and the first throttle part to a position between the outdoor heat exchanger and the second throttle part in the third refrigerant passage, and a second opening/closing part for opening/closing the bypass passage.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: March 24, 2015
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Atsushi Inaba, Mikiharu Kuwahara
  • Patent number: 8978400
    Abstract: This invention relates generally to oil lubricated helium compressor units for use in cryogenic refrigeration systems, operating on the Gifford McMahon (GM) cycle. The objective of this invention is to keep the oil separator and absorber, which are components in an oil lubricated, helium compressor, in an indoor air conditioned environment while rejecting at least 65% of the heat from the compressor outdoors during the summer. The balance of the heat is rejected to either the indoor air conditioned air, or cooling water. This is accomplished by circulating hot oil at high pressure to an outdoor air cooled heat exchanger and returning cooled oil to the compressor inlet, while hot high pressure helium is cooled in an air or water cooled heat exchanger in an indoor assembly that includes the compressor, an oil separator, an oil absorber, and other piping and control components. It is an option to reject the heat from the oil to the indoor space during the winter to save on the cost of heating the indoor space.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: March 17, 2015
    Assignee: Sumitomo (Shi) Cryogenics of America Inc.
    Inventors: Stephen Dunn, Ralph Longsworth
  • 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
  • Publication number: 20150040597
    Abstract: An outdoor heat exchanger includes tube-outside heat transfer coefficient adjusting means configured to adjust a heat transfer coefficient ?o of the outside of a heat transfer tube through which a refrigerant flows, tube-inside heat transfer coefficient adjusting means configured to adjust a heat transfer coefficient ?i of the inside of the heat transfer tube through which the refrigerant flows, and heat transfer area adjusting means configured to adjust a heat transfer area A where the refrigerant exchanges heat with a heat medium. A controller controls the heat transfer coefficient ?o of the outside of the heat transfer tube, the heat transfer coefficient ?i of the inside thereof, and the heat transfer area A to control a heat exchange amount of the outdoor heat exchanger.
    Type: Application
    Filed: March 29, 2012
    Publication date: February 12, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadashi Ariyama, Kosuke Tanaka, Hirofumi Koge, Hiroyuki Okano
  • Patent number: 8925336
    Abstract: A refrigerant system operates in an environment defined by three distinct temperature levels, such as, for instance, the outdoor ambient temperature level, the indoor temperature level and the refrigeration temperature level. The refrigerant system is provided with an air-to-refrigerant heat exchanger located within the general indoor environment and connected to receive the flow of refrigerant from a heat rejection heat exchanger. The air-to-refrigerant heat exchanger gives off heat to the indoor air and in the process further cools the refrigerant flowing to an expansion device to thereby increase the cooling effect provided by an evaporator to the refrigeration area. Provisions are also made to partially or entirely bypass the air-to-refrigerant heat exchanger and/or the heat rejection heat exchanger, on a selective basis.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: January 6, 2015
    Assignee: Carrier Corporation
    Inventors: Alexander Lifson, Michael F. Taras
  • Patent number: 8904813
    Abstract: A pulse width modulation control is provided for a suction valve on a suction line, delivering refrigerant into a housing shell of a compressor. When the suction valve is closed, the pressure within the housing shell can become very low. Thus, a pressure regulator valve is included within the refrigerant system to selectively deliver a limited amount of refrigerant into the housing shell when the suction valve is closed. The delivery of this limited amount of refrigerant ensures that a specified pressure is maintained within the housing shell to achieve the most efficient operation while at the same time preventing problems associated with damage to electrical terminals, motor overheating and excessive discharge temperature.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: December 9, 2014
    Assignee: Carrier Corporation
    Inventors: Alexander Lifson, Michael F. Taras
  • 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
  • Publication number: 20140318163
    Abstract: An air-conditioning apparatus is capable of completing heat medium freeze prevention control more quickly by performing heat medium temperature rise control for raising the temperature of a cooled heat medium and includes a controller that adjusts a current opening degree of a bypass device at a bypass pipe to an opening degree, and that makes an adjustment such that the flow passage resistance in the case of the opening degree becomes equal to the flow passage resistance in the case of an opening degree before an expansion device is adjusted to a minimum opening degree.
    Type: Application
    Filed: November 18, 2011
    Publication date: October 30, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Keisuke Takayama, Koji Azuma, Yuji Motomura, Takeshi Hatomura
  • Patent number: 8869554
    Abstract: Gas treatment equipment includes a compressor which compresses process gas, a first process module which is disposed downstream of the compressor and which treats the process gas, an expander which is disposed downstream of the first process module and which expands the process gas to obtain power, a second process module which is disposed downstream of the expander and which treats the process gas, and a driver which drives the compressor. A first pressure indicator is disposed at an inlet of the compressor for the process gas and measures a pressure of the process gas, and a second pressure indicator is disposed at an outlet of the second process module for the process gas and measures a pressure of the process gas. A recirculation flow path is connected to both of the outlet of the second process module for the process gas and the inlet of the compressor.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: October 28, 2014
    Assignee: Mitsubishi Heavy Industries Compressor Corporation
    Inventors: Kazuhiro Takeda, Yosuke Nakagawa, Tomoaki Takeda, Yasushi Mori
  • 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
  • Publication number: 20140260386
    Abstract: An air conditioning system includes: first and second utilization side heat exchangers and a heat source side heat exchanger respectively connected in series; a compressor connected between the first utilization side heat exchanger and the heat source side heat exchanger; an expansion valve connected between the first utilization side heat exchanger and the second utilization side heat exchanger; a pressure control device connected between the second utilization side heat exchanger and the heat source side heat exchanger; and a bypass valve connected between the expansion valve and the heat source side heat exchanger. The bypass valve provides a variable amount of liquid refrigerant flowing from the expansion valve to the heat source side heat exchanger. The pressure control device and the bypass valve cooperate with each other to keep a temperature of the compressor below a maximum allowable temperature predetermined for the compressor.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicants: MITSUBISHI ELECTRIC US, INC., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kensaku HATANAKA, Kazuyoshi SHINOZAKI, Joseph Paul BUSH, Peter Christian FLYNN
  • 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
  • Patent number: 8820106
    Abstract: A heat source-side refrigerant circuit A including a compressor 11, an outdoor heat exchanger 13, a first refrigerant branch portion 21 connected to the compressor 11, a second refrigerant branch portion 22 and a third refrigerant branch portion 23 connected to the outdoor heat exchanger 13, a first refrigerant flow rate control device 24 provided between branch piping 40 and the second refrigerant branch portion 22, intermediate heat exchangers 25n connected at one side thereof to the first refrigerant branch portion 21 and the third refrigerant branch portion 23 via three-way valves 26n and connected at the other side thereof to the second refrigerant branch portion 22, and second refrigerant flow rate control devices 27n provided between the respective intermediate heat exchangers 25n and the second refrigerant branch portion 22, and user-side refrigerant circuits Bn having indoor heat exchangers 31n connected respectively to the intermediate heat exchangers 25n are provided, and at least one of water and
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: September 2, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Koji Yamashita, Takashi Okazaki, Naoki Tanaka, Keisuke Hokazono, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura, Tomohiko Kasai, Naofumi Takenaka, Yusuke Shimazu
  • Patent number: 8789381
    Abstract: The refrigeration unit of an electrically powered trailer refrigeration system includes an economized scroll compressor and an economizer circuit selectively operable to inject refrigeration vapor into an intermediate stage of the scroll compressor. An engine driven generator produces AC current to power the scroll compressor and other electric components of the system. During operation of the refrigeration system at high capacity demand, a controller will operate the refrigeration system in an economized mode if sufficient electric power is available from the generator and in the non-economized mode if insufficient power is available to sustain operation of the refrigeration system in the economized mode.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: July 29, 2014
    Assignee: Carrier Corporation
    Inventors: Nader S. Awwad, Michael Stockbridge
  • Patent number: 8783050
    Abstract: A time for loading a refrigerant is shortened when a utilization unit of an air conditioner is installed. A heat source unit 1 includes a compressor 100; a heat-source-side heat exchanger 200; a refrigerant regulator 61 storing a refrigerant; an introducing pipe 62 which is a pipe that is branched off from a discharge-side pipe 110 of the compressor 100 and connected to the refrigerant regulator 61, and introduces the refrigerant discharged from the compressor 100 into the refrigerant regulator 61; and a lead-out pipe 63 which is a pipe that is connected from the refrigerant regulator 61 to an intake-side pipe 120 of the compressor 100, and leads out the refrigerant stored in the refrigerant regulator 61 into the intake-side pipe 120.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: July 22, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Atsushi Okamoto, Shinya Matsuoka, Takuya Kotani
  • Patent number: 8707720
    Abstract: The present invention relates to a hybrid vapor compression—absorption cooling or heating system and apparatus containing a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides for the performance of a hybrid vapor compression—absorption cycle that utilizes refrigerants and absorbents such as fluorocarbon gases in fluorinated ionic liquids. The present invention also provides a method of cooling by the execution of a hybrid vapor compression—absorption cycle using a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides a method of heating by the execution of a hybrid vapor compression—absorption cycle using a refrigerant pair comprising at least one refrigerant and at least one ionic liquid.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: April 29, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki