Plural Variable Restrictors In Flow Line Patents (Class 62/205)
  • Patent number: 11179999
    Abstract: A heat pump system includes a compressor that compresses and discharges a refrigerant, a decompressor that decompresses the refrigerant, an outdoor unit that exchanges heat between the refrigerant and an outside air, an evaporator that evaporates the refrigerant, a condenser that condenses the refrigerant, an internal heat exchanger, an accumulator that separates the refrigerant into a gas refrigerant and a liquid refrigerant, and a flow pathway changing portion. The internal heat exchanger includes a high-pressure passage through which a high-pressure refrigerant flows, and a low-pressure passage through which a low-pressure refrigerant flows, the internal heat exchanger exchanging heat between the refrigerant flowing through the high-pressure passage and the refrigerant flowing through the low-pressure passage. The flow pathway changing portion that switches between a cooling pathway and a heating pathway. According to this heat pump system, a cooling capacity and a heating capacity can be improved.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: November 23, 2021
    Assignee: DENSO CORPORATION
    Inventors: Hiroshi Mieda, Ryohei Sugimura, Masaaki Kawakubo, Yuichi Kami
  • Patent number: 10823472
    Abstract: A refrigeration system, including: a compressor, a condenser, an economizer, a throttle valve, and an evaporator which are connected via a pipeline; and a pneumatic valve that includes a valve body and a drive gas phase refrigerant chamber, an gas phase refrigerant outlet of the economizer being connected to an interstage gas phase refrigerant inlet of the compressor via the valve body, and the drive gas phase refrigerant chamber being connected to a low pressure portion of the refrigeration system via a first gas phase refrigerant path, the lower pressure portion having a pressure lower than that in the economizer; wherein a first valve for controlling on/off of the first gas phase refrigerant path is disposed on the first gas phase refrigerant path. The refrigeration system can avoid liquid phase refrigerant accumulated in the economizer from entering the compressor during start to cause a liquid impact problem.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: November 3, 2020
    Assignee: CARRIER CORPORATION
    Inventors: Haiping Ding, Michael Stark, Lihui Yang
  • Patent number: 10797639
    Abstract: A system and method to analyze building performance without requiring an on-site energy audit or customer input is described. The analysis combines total customer energy load from a power utility with externally-supplied meteorological data to analyze each customer's building performance. Building thermal performance is characterized to produce a rich dataset that the power utility can use in planning and operation, including assessing on-going and forecasted power consumption, and for other purposes, such as providing customers with customized information to inform their energy investment decisions and identifying homes for targeted efficiency funding.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: October 6, 2020
    Assignee: CLEAN POWER RESEARCH, L.L.C.
    Inventor: Thomas E. Hoff
  • Patent number: 10719789
    Abstract: Potential energy investment scenarios can be evaluated. Energy performance specifications and prices for both existing and proposed energy-related equipment are selected, from which an initial capital cost is determined. The equipment selections are combined with current fuel consumption data, thermal characteristics of the building, and, as applicable, solar resource and other weather data to create an estimate of the fuel consumption of the proposed equipment. An electricity bill is calculated for the proposed equipment, from which an annual cost is determined. The payback of the proposed energy investment is found by comparing the initial and annual costs.
    Type: Grant
    Filed: June 2, 2014
    Date of Patent: July 21, 2020
    Assignee: CLEAN POWER RESEARCH, L.L.C.
    Inventor: Thomas E. Hoff
  • Patent number: 10625560
    Abstract: There is disclosed a vehicle air conditioner which is capable of enlarging an effective range of a dehumidifying and heating mode to environmental conditions and smoothly dehumidifying and heating a vehicle interior. A vehicle air conditioner 1 executes a dehumidifying and heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, and decompresses the refrigerant by which heat has been radiated and then lets the refrigerant absorb heat in a heat absorber 9 and an outdoor heat exchanger 7, the controller decreases an outdoor blower voltage FANVout of an outdoor blower 15 and decreases an air volume into the outdoor blower 15 in a case where a temperature Te of the heat absorber 9 is high even when the controller adjusts a valve position of an outdoor expansion valve 6 into a lower limit of controlling in a situation in which a temperature TCI of the radiator 4 is satisfactory.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: April 21, 2020
    Assignee: SANDEN HOLDINGS CORPORATION
    Inventors: Ryo Miyakoshi, Kenichi Suzuki
  • Patent number: 10544968
    Abstract: A refrigeration apparatus includes a container such as an evaporator for holding refrigerant, and a compressor for compressing refrigerant vapor. The compressed vapor is returned to the container, and stored as liquid. The liquid refrigerant is withdrawn from the container and then returned to the container via a first path through a heat exchanger for cooling a space, or a second path that does not pass through the heat exchanger. Upon returning to the container, the liquid refrigerant is at least partly evaporated due to the reduced pressure in the container caused by the operation of the compressor, and the container is cooled by the latent heat of evaporation. Thus, the container can act as a cold storage unit. The cold storage effect is increased when the refrigerant is returned to the container via the second path.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: January 28, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tomoichiro Tamura, Hidetoshi Taguchi, Bunki Kawano, Takahiro Matsuura
  • Patent number: 10391835
    Abstract: Methods and system for providing de-icing a heat pump heat exchanger and heating a vehicle passenger cabin are presented. In one example, a heat pump that experiences icing of exterior heat exchanger fins may be operated in a cooling mode where a passenger cabin heat exchanger operates as an evaporator to improve de-icing of the exterior heat exchanger fins.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: August 27, 2019
    Assignee: Ford Global Technologies, LLC
    Inventors: Timothy Noah Blatchley, Franco Ragazzi
  • Patent number: 10024582
    Abstract: A condenser and evaporator system includes (i) a condenser system positioned to receive a gaseous refrigerant from a compressor system and configured to condense the gaseous refrigerant into a liquid refrigerant, (ii) a controlled pressure receiver (CPR) positioned to receive and store the liquid refrigerant, (iii) an evaporator system including a conduit, an expansion valve, and a fan, and (iv) a controller. The conduit is positioned to receive the liquid refrigerant from the CPR. The expansion valve is positioned between the CPR and the conduit, and configured to facilitate modulating an amount of the liquid refrigerant that flows into the conduit from the CPR. The fan is positioned to facilitate providing a cooling operation to an area associated with the evaporator system through evaporation of the liquid refrigerant flowing through the conduit. The controller is configured to control a stage of the condenser system and/or the evaporator system.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: July 17, 2018
    Assignee: Johnson Controls Technology Company
    Inventor: Thomas P. Carter
  • Patent number: 9765979
    Abstract: A heat-pump circuit may include an indoor heat exchanger, an outdoor heat exchanger, a compressor adapted to circulate a working fluid between the indoor and outdoor heat exchangers, and an expansion device disposed between the indoor and outdoor heat exchangers. A monitor for the heat-pump system may include a return-air temperature sensor, a supply-air temperature sensor, and a processor. The return-air temperature sensor may be adapted to measure a first air temperature of air upstream of the indoor heat exchanger. The supply-air temperature sensor may be adapted to measure a second air temperature of air downstream of the indoor heat exchanger. The processor may be in communication with the return-air temperature sensor and the supply-air temperature sensor. The processor may be programmed to determine a working-fluid-charge condition of the heat-pump system based on the first and second air temperatures.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: September 19, 2017
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Fadi M. Alsaleem, Gregg M. Hemmelgarn
  • Patent number: 9696059
    Abstract: A combined heating, ventilation, air conditioning, and refrigeration (“HVACR”) system including an HVAC sub-system and a refrigeration sub-system. The HVAC sub-system is in communication with an open space of an indoor environment and includes a first condenser, a first evaporator, and a first compressor at least partially defining a first refrigerant circuit circulating a first refrigerant for selectively conditioning an airflow within the HVAC subsystem that conditions the open space. The refrigeration sub-system is in communication with an enclosed space within the indoor environment and includes a second condenser, a second evaporator, and a second compressor and at least partially defining a second refrigerant circuit circulating a second refrigerant for selectively conditioning the enclosed space. Heat from the second refrigerant is selectively transferred to the airflow within the second condenser to reheat the airflow prior to the airflow being discharged into the open space.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: July 4, 2017
    Assignee: Hussmann Corporation
    Inventors: Norm E. Street, Roger J. Voorhis, Doron Shapiro
  • Patent number: 9599380
    Abstract: When a first temperature difference is the difference between a saturated gas temperature of a first refrigerant at an inlet side and a saturated liquid temperature of the first refrigerant at an outlet side in a heat exchanger for heating, and when a second temperature difference is the difference between a saturated gas temperature of a second refrigerant at an outlet side and a temperature of the second refrigerant at an inlet side in the heat exchanger for heating, the difference between the first temperature difference and the second temperature difference is held in a predetermined value or less by charging the second refrigerant to the second refrigeration cycle so that a plurality of single refrigerants forming the second refrigerant have a predetermined mixing ratio.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: March 21, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Koji Yamashita
  • Patent number: 9316420
    Abstract: An air-conditioning apparatus including a refrigerant circuit having an excess refrigerant recovery pipe connected between an inlet of at least one of heat source side heat exchangers and a first refrigerant flow blocking device or between an outlet of the at least one of the heat source side heat exchangers and a second refrigerant flow blocking device, to a passage connected to a suction side of a compressor, and an excess refrigerant recovery device disposed in the excess refrigerant recovery pipe.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: April 19, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koji Yamashita, Hiroyuki Morimoto, Takeshi Hatomura, Shinichi Wakamoto, Naofumi Takenaka
  • Patent number: 9211778
    Abstract: A vehicle air conditioner (1A) includes a heat pump circuit (2) including a compressor (11), an outdoor heat exchanger (13), an expansion mechanism (14), a first indoor heat exchanger (15), and a second indoor heat exchanger (16). The flow direction of a refrigerant in the heat pump circuit (2) is switched, by a switching member (12A), between a first direction in which the refrigerant discharged from the compressor (11) passes through the outdoor heat exchanger (13), the expansion mechanism (14), the first indoor heat exchanger (15), and the second indoor heat exchanger (16) in this order and returns to the compressor (11), and a second direction in which the refrigerant discharged from the compressor (11) passes through the first indoor heat exchanger (15), the expansion mechanism (14), the outdoor heat exchanger (13), and the second indoor heat exchanger (16) in this order and returns to the compressor (11).
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: December 15, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Yasufumi Takahashi
  • Patent number: 9027358
    Abstract: A vehicle heat pump system includes a compressor, a first valve coupled to an outlet of the compressor, a cooling circuit between the first valve and the inlet of the compressor, a heating circuit between the first valve and the inlet of the compressor and a controller. The heating circuit includes a heating circuit evaporator and a second valve between the heating circuit evaporator and the inlet of the compressor. The controller is configured to operate the first valve to switch between a cooling mode and a heating mode, cycle the second valve opened and closed in the heating mode, such that when closed, the compressor draws refrigerant out of the cooling circuit and refrigerant pressure builds up within the heating circuit, and maintain the second valve open upon the controller determining that sufficient refrigerant has been drawn out of the cooling circuit during the cycling of the second valve.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: May 12, 2015
    Assignee: Nissan North America, Inc.
    Inventor: Ronald Eisenhour
  • Patent number: 8939196
    Abstract: A secondary pump-type heat source system includes: heat sources connected in parallel; a load system in which the heat source water flows; a primary pump supplying the heat source water to the load system; a secondary pump provided for each heat source and supplies the heat source water subjected to heat exchange in the load system to the heat source; and a heat source controller calculating flow quantity of the heat source water flowing in the heat source side and flow quantity of the heat source water flowing in the load system side by assigning a result from measurement by a water temperature sensor detecting heat source temperature to an operating characteristic of each heat source and controlling operation of the secondary pumps based on the calculation result.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: January 27, 2015
    Assignee: Toshiba Carrier Corporation
    Inventors: Takeru Morita, Yuuji Matsumoto, Seiji Tsukiyama, Manabu Yamamoto
  • Publication number: 20140260387
    Abstract: When indoor units are performing a cooling operation, an air-conditioning apparatus controls third flow passage switching valves, for example a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve, so that a number of intermediate heat exchangers operating as evaporators is greater than in a cooling main operation. During the cooling main operation, a target value for suction pressure or evaporating temperature at a compressor is set equal to or lower than that in a case in which the indoor units are performing the cooling operation, and a frequency of the compressor and a capacity of a heat-source-side heat exchanger are controlled.
    Type: Application
    Filed: January 5, 2012
    Publication date: September 18, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naofumi Takenaka, Shinichi Wakamoto, Osamu Morimoto, Daisuke Shimamoto
  • Patent number: 8650906
    Abstract: A system and process to re-liquefy boil-off liquid natural gas in varied amounts by a process using a screw compressor having an effective compression range from about 10 to about 100 percent of its rated capacity.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: February 18, 2014
    Assignee: Black & Veatch Corporation
    Inventors: Brian C. Price, Randal J. Winkler
  • Patent number: 8578725
    Abstract: An air conditioning apparatus includes a refrigerant circuit, first and second shut-off mechanisms, a communication pipe and a refrigerant detection mechanism. The refrigerant circuit is configured to at least perform a cooling operation. The first shut-off mechanism is downstream of the receiver and upstream of the liquid refrigerant connection pipe when the cooling operation is performed. The second shut-off mechanism is downstream of the heat source-side heat exchanger and upstream of the receiver when the cooling operation is performed. The communication pipe interconnects the refrigerant circuit between the first and second shut-off mechanisms, and the refrigerant circuit on the suction side of the compressor. The refrigerant detection mechanism is upstream of the second shut-off mechanism when the cooling operation is performed.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: November 12, 2013
    Assignee: Daikin Industries, Ltd.
    Inventor: Tadafumi Nishimura
  • Patent number: 8549868
    Abstract: A refrigeration cycle apparatus (50) includes: a main refrigerant circuit (21) having a compressor (1), a radiator (2), a first expansion mechanism (5), a second expansion mechanism (6), and an evaporator (4); an injection passage (22) for supplying an intermediate-pressure refrigerant to an injection port 1c of the compressor 1; and a water circuit (30) through which water to be heated in the radiator (2) flows. The refrigeration cycle apparatus (50) includes a sub heat exchanger (3) for cooling the water in the water circuit (30) by exchanging heat between the refrigerant in the injection passage (22) and the water to be heated in the radiator (2).
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: October 8, 2013
    Assignee: Panasonic Corporation
    Inventors: Kou Komori, Yuichi Yakumaru, Tomoichiro Tamura, Masaya Honma, Hiroki Hayashi
  • Patent number: 8522568
    Abstract: An air conditioner (1) includes a refrigerant circuit (10) configured to perform a supercritical refrigeration cycle and including: an outdoor circuit (21) including a compressor (22), an outdoor heat exchanger (23), and an outdoor expansion valve (24); and two indoor circuits (31a, 31b) including indoor heat exchangers (33a, 33b) and indoor expansion valves (34a, 34b). The air conditioner (1) further includes a controller (50) configured to control outlet refrigerant temperatures of the indoor heat exchangers (33a, 33b).
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: September 3, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Tetsuya Okamoto, Shinichi Kasahara
  • Patent number: 8505321
    Abstract: For cooling operation, a refrigeration apparatus includes a heat-source-side valve opening controller for controlling a degree of opening of a heat-source-side expansion valve so that pressure of a refrigerant flowing into the utilization-side expansion valve in the cooling operation becomes equal to or lower than a predetermined reference pressure value. For heating operation, the refrigeration apparatus includes a utilization-side valve opening controller for performing, when a low-quantity utilization unit in which a quantity of the refrigerant falls below a quantity of the refrigerant required for delivering capacity of the utilization unit is found among a plurality of the utilization units in the heating operation, valve opening reducing operation of reducing a degree of opening of the utilization-side expansion valve of the utilization unit except for the low-quantity utilization unit.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: August 13, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Satoshi Kawano, Shinya Matsuoka
  • Patent number: 8418489
    Abstract: A refrigeration system includes a refrigerant circuit performing a vapor compression supercritical refrigeration cycle. The system includes a compression mechanism, a heat source heat exchanger, an expander, and a utilization heat exchanger. The expander includes, for two-stage compression, a high pressure side and a low pressure side throttle mechanism, both variable in the amount of throttling. A controller is configured to derive a target value, providing a maximum COP, for the pressure of high pressure refrigerant in the refrigerant circuit based on the temperature of refrigerant at the outlet of either the heat source side heat exchanger or the utilization side heat exchanger, whichever becomes a heat dissipation side heat exchanger functioning as a heat dissipation unit and on the temperature of a medium exchanging heat with refrigerant in the heat dissipation side heat exchanger, at the inlet of the heat dissipation side heat exchanger.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: April 16, 2013
    Assignee: Daikin Industries, Ltd.
    Inventor: Masakazu Okamoto
  • Patent number: 8322154
    Abstract: A cooling system and method are provided for facilitating two-phase heat transfer from an electronics system including a plurality of electronic devices to be cooled. The cooling system includes a plurality of evaporators coupled to the electronic devices, and a coolant loop for passing system coolant through the evaporators. The coolant loop includes a plurality of coolant branches coupled in parallel, with each coolant branch being coupled in fluid communication with a respective evaporator. The cooling system further includes a control unit for maintaining pressure of system coolant at a system coolant supply side of the coolant branches within a specific pressure range at or above saturation pressure of the system coolant for a given desired saturation temperature of system coolant into the evaporators to facilitate two-phase heat transfer in the plurality of evaporators from the electronic devices to the system coolant at the given desired saturation temperature.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: December 4, 2012
    Assignee: International Business Machines Corporation
    Inventors: Levi A. Campbell, Richard C. Chu, Michael J. Ellsworth, Jr., Madhusudan K. Iyengar, Robert E. Simons
  • Patent number: 8221628
    Abstract: In one embodiment, the present invention includes a liquid processing system. In the liquid processing system, a first liquid source transmits feed liquid to a heat exchange unit while a heat generation unit transmits warm coolant to the heat exchange unit. A heat generation unit warms the feed liquid while cooling the warm coolant. The warmed feed liquid is sent to a pump, and cooled feed liquid from a second liquid source is mixed with the warmed feed liquid as necessary until a target temperature is reached. The warmed feed liquid is sent to a reverse osmosis unit for filtering and the resulting permeate is sent to the liquid utilization unit. The cooled coolant is sent from the heat exchange unit to the storage tank and if the cooled coolant is not cool enough, it is sent to a cooling tower for further cooling.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: July 17, 2012
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventor: John A. Goodfellow
  • Patent number: 8205464
    Abstract: A refrigeration device includes a compression mechanism, a radiator, a first expansion mechanism, a liquid receiver, a second expansion mechanism, an evaporator, a pressure detector, a temperature detector, and a control unit. The pressure detector is provided between the refrigerant discharge side of the compression mechanism and the refrigerant inflow side of the first expansion mechanism. The temperature detector is provided between the exit side of the radiator and the refrigerant inflow side of the first expansion mechanism. The control unit controls the first expansion mechanism using the pressure detected by the pressure detector and the temperature detected by the temperature detector so that the refrigerant flowing out from the first expansion mechanism reaches a saturated state.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: June 26, 2012
    Assignee: Daikin Industries, Ltd.
    Inventors: Shinichi Kasahara, Toshiyuki Kurihara
  • Patent number: 8181480
    Abstract: A refrigeration device includes a compression mechanism, a radiator, a first expansion mechanism, a second expansion mechanism, an evaporator, a first internal heat exchanger, a branch pipe a third expansion mechanism, and a second internal heat exchanger. The first internal heat exchanger causes heat to be exchanged between refrigerant that flows from the radiator to the inflow side of the first expansion mechanism, and refrigerant that flows from the evaporator to the compression mechanism. The branch pipe branches from a third refrigerant pipe for connecting the radiator and the second expansion mechanism, and merges with the second refrigerant pipe. A third expansion mechanism is provided to the branch pipe. The second internal heat exchanger causes heat to be exchanged between refrigerant that flows out from the first expansion mechanism, and refrigerant that flows out from the third expansion mechanism.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: May 22, 2012
    Assignee: Daikin Industries, Ltd.
    Inventors: Shinichi Kasahara, Toshiyuki Kurihara, Shuuji Fujimoto, Takahiro Yamaguchi, Atsushi Yoshimi, Yoshio Ueno
  • Patent number: 8176743
    Abstract: A refrigeration device includes a control unit, and a refrigerant circuit in which a compression mechanism, a radiator, a refrigerant cooling unit, a first expansion mechanism, a liquid receiver, a second expansion mechanism, and an evaporator are connected in sequence. The control unit performs refrigerant cooling control whereby the refrigerant is cooled by the refrigerant cooling unit so that the state of the refrigerant that has flowed out from the first expansion mechanism is near the saturation line and not near the critical point.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: May 15, 2012
    Assignee: Daikin Industries, Ltd.
    Inventors: Toshiyuki Kurihara, Shinichi Kasahara
  • Patent number: 8156750
    Abstract: A vapor compression refrigeration system including components capable of determining the superheat at a compressor inlet is provided. The vapor compression refrigeration system may include sensors capable of making measurements from which the superheat at the compressor inlet may be determined. The vapor compression refrigeration system may be operable to compare the determined superheat level at the inlet to the compressor to a desired superheat level and generate a new evaporator discharge superheat level target for one or more evaporators operatively interconnected to the compressor to affect the superheat at the compressor inlet. The vapor compression refrigeration system may be operable to broadcast the new evaporator discharge superheat level target to the one or more evaporators over a communications bus. The vapor compression refrigeration system may update and broadcast the evaporator discharge superheat level target at programmed intervals.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: April 17, 2012
    Assignee: Agri Control Technologies, Inc.
    Inventors: John Michael Butorac, Timothy Thomas Pearson
  • Patent number: 8020393
    Abstract: A heat pump type hot water supply outdoor apparatus, in a compressor, a water heat exchanger, a first expansion valve, a medium pressure receiver, a second expansion valve, and an air heat exchanger are connected circularly, has an injection circuit, which is a bypass for a part of the refrigerant between the medium pressure receiver and the second pressure reduction unit, to inject the part of refrigerant into a compression chamber of the compressor, and has a third expansion valve and an internal heat exchanger for carrying out heat exchange between the refrigerant whose pressure is reduced by the third expansion valve and the refrigerant between the medium pressure receiver and the second expansion valve, a pressure detection sensor for detecting a condensing pressure, and a controller for starting an injection control by the third expansion valve at the time when the condensing pressure detected by the pressure sensor or the condensing temperature calculated from the condensing pressure becomes a first pr
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: September 20, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuki Okada, Takahiro Ushijima, Kengo Takahashi
  • Patent number: 7797956
    Abstract: A first motor-actuated expansion valve and a second motor-actuated expansion valve which are connected in parallel with each other in back-to-back connection are provided between an outdoor heat exchanger and an indoor heat exchanger. In the first motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the indoor heat exchanger side is higher than the refrigerant pressure on the outdoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the indoor heat exchanger side. In the second motor-actuated expansion valve, at the time of non-operation and full closure, when the refrigerant pressure on the outdoor heat exchanger side is higher than the refrigerant pressure on the indoor heat exchanger side by a predetermined value or more, the full closure is released by receiving the refrigerant pressure on the outdoor heat exchanger side.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: September 21, 2010
    Assignees: Sanyo Electric Co., Ltd, Toshiba Carrier Corporation
    Inventors: Akira Terasaki, Kazuto Okitsu
  • Patent number: 7637114
    Abstract: A substrate processing apparatus includes: a processing room in which a semiconductor substrate may be treated by a process; a cooling unit positioned to cool the processing room, the cooling unit configured to convey cooling fluid; and a temperature-adjusting unit that alters the temperature of the cooling fluid supplied into the cooling unit. The temperature-adjusting unit has a cycling circuit. The cycling circuit has a compressor configured to compress a refrigerant, a condenser configured to condense the compressed refrigerant, an expander configured to expand the condensed refrigerant, the expander including a plurality of expansion valves arranged in parallel, and an evaporator configured to evaporate the expanded refrigerant, the evaporator positioned to cool the cooling fluid.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: December 29, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong-Hyun Choi, Moon-Soo Park, Jong-Chul Kin, Yong-Dae Kim
  • Patent number: 7354005
    Abstract: A climate control system having two or more stages of cooling operation or heating operation is provided for supplying conditioned air to a plurality of zones within a space, where the climate control system comprises a plurality of controllable zone dampers for controlling the supply of conditioned air to each of the plurality of zones, and a plurality of zone temperature sensors for periodically sensing temperature at preset intervals and transmitting sensed temperature information when the temperature of the zone has changed by more than a predetermined amount.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: April 8, 2008
    Assignee: Emerson Electric Co.
    Inventors: Steven L. Carey, Jeff Edgar, Thomas J. Fredricks
  • Patent number: 7134294
    Abstract: A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls the variable valve independently of the expansion valves to meet cooling demand by determining a change in a measured parameter and controlling at least one of the variable valves based upon the change to an approximately fully open position.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 14, 2006
    Assignee: Computer Process Controls, Inc.
    Inventors: Abtar Singh, Jim Chabucos, Paul Wickberg, John G Wallace
  • Patent number: 7121103
    Abstract: An automobile air conditioning system controls the high pressure of the refrigeration cycle in a wide range of airflows from a low airflow region during an intermediate period to a high airflow region. When a dehumidifying mode is selected, the target high pressure at which the cycle efficiency calculated from a gas cooler outlet refrigerant temperature is maximized is defined as a target value to a valve such as a heating variable throttle valve to control the high pressure of the refrigeration cycle to the target value. This permits control such that the cycle efficiency of the refrigeration cycle is maximized in a wide range of airflow from a low airflow region during an intermediate period to a high airflow region at a relatively low, about 10° C., outside air temperature.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: October 17, 2006
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Toshinobu Homan, Keiichi Kitamura
  • Patent number: 7086242
    Abstract: A dehumidifying air-conditioning apparatus comprises a pressurizer (4) for raising a pressure of a refrigerant, a condenser (5) for condensing the refrigerant to heat a high-temperature heat source fluid, and an evaporator (1) for evaporating the refrigerant to cool process air to a temperature lower than its dew point. A first heat exchanging portion (21) is disposed in a refrigerant path between the condenser (5) and the evaporator (1) for evaporating the refrigerant under an intermediate pressure between the condensing pressure of the condenser (5) and the evaporating pressure of the evaporator (1) to cool the process air by evaporation of the refrigerant under the intermediate pressure.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: August 8, 2006
    Assignee: Ebara Corporation
    Inventor: Kensaku Maeda
  • Patent number: 6986385
    Abstract: A heating/air-conditioning installation for a motor vehicle has a thermal loop which includes a refrigerating compressor, a gas cooler, a pressure-reducing valve, an evaporator, and a heating element. The gas cooler and the heating element are grouped together into a single exchanger including a main module forming a main fluid-carrying heat exchanger.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: January 17, 2006
    Assignee: Valeo Climatisation
    Inventors: Elliot Gilles, Ben Fredj Mounir
  • Patent number: 6857280
    Abstract: By the use of the suction pressure of a compressor, the pressure in back pressure chambers 71g and 71h are reduced to open a refrigerant inlet side and a refrigerant outlet side of an evaporator, and when the compressor is at rest, by the use of a first coil spring 76 and a second coil spring 77, the refrigerant inlet side and the refrigerant outlet side of the evaporator 40 are closed mechanically. Due to this, it is possible to minimize a refrigerant leak by the use of an inexpensive means.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: February 22, 2005
    Assignee: Denso Corporation
    Inventors: Yasushi Yamanaka, Yoshitaka Tomatsu
  • Patent number: 6751970
    Abstract: A vapor compression refrigeration and freezer system includes a compressor, a condenser, an expansion devise and an evaporator which includes an evaporator coil having an inlet and an outlet which coil is in heat exchange relation with an air medium along substantially the entire coil length. The inlet to the evaporator coil is in flow communication with an outlet of the expansion devise via an evaporator feedline.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: June 22, 2004
    Assignee: XDX, Inc.
    Inventor: David A. Wightman
  • Patent number: 6644052
    Abstract: A vapor compression refrigeration and freezer system includes a compressor, a condenser, an expansion devise and an evaporator which includes an evaporator coil having an inlet and an outlet which coil is in heat exchange relation with an air medium along substantially the entire coil length. The inlet to the evaporator coil is in flow communication with an outlet of the expansion devise via an evaporator feedline.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: November 11, 2003
    Assignee: XDX, LLC
    Inventor: David A. Wightman
  • Patent number: 6415619
    Abstract: System and method for reducing temperature variation among heat dissipating components in a multi-component computer system. In this respect, component temperatures are controlled to remain relatively constant (approximately within 5° C.) with respect to other components, while allowing for multiple fluctuating heat loads between components. A refrigeration system possessing a variable speed compressor or a constant speed compressor is utilized to control the flow of refrigerant through the refrigeration system. The temperature variation among components is reduced by independently metering the mass flow rate of the refrigerant flowing into each component to compensate for the amount of heat load on each component. In this respect, the mass flow rate of the refrigerant entering into each of the evaporators is metered by valves located upstream from each of the evaporators.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: July 9, 2002
    Assignee: Hewlett-Packard Company
    Inventors: Cullen E. Bash, Abdlmonem H Beitelmal, Ratnesh Sharma
  • Patent number: 6314747
    Abstract: A vapor compression refrigeration system includes an evaporator, a compressor, and a condenser interconnected in a closed-loop system. In one embodiment, a multifunctional valve is configured to receive a liquefied heat transfer fluid from the condenser and a hot vapor from the compressor. A saturated vapor line connects the outlet of the multifunctional valve to the inlet of the evaporator and is sized so as to substantially convert the heat transfer fluid exiting the multifunctional valve into a saturated vapor prior to delivery to the evaporator. The multifunctional valve regulates the flow of heat transfer fluid through the valve by monitoring the temperature of the heat transfer fluid returning to the compressor through a suction line coupling the outlet of the evaporator to the inlet of the compressor.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: November 13, 2001
    Assignee: XDX, LLC
    Inventor: David A. Wightman
  • Patent number: 6272869
    Abstract: An expansion device in a refrigeration chiller defines at least two fixed orifices and employs at least two positionable valve members in order to minimize the overall flow area through the expansion device under a first set of chiller operating conditions, to maximize the overall flow area through the expansion device under a second set of chiller operating conditions and to define a flow area intermediate said minimum and said maximum flow areas when a third set of chiller operating conditions exist.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: August 14, 2001
    Assignee: American Standard International Inc.
    Inventor: David H. Eber
  • Patent number: 6272870
    Abstract: A system for use in regulating the flow of a working fluid, such as a refrigerant, is provided which includes a pressure regulating device. The pressure regulating device controls the mass flow rate of the working fluid in the refrigeration system. The pressure regulating device is controlled based on the saturation characteristics of the working fluid.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: August 14, 2001
    Assignee: Emerson Electric Co.
    Inventor: Wayne G. Schaeffer
  • Patent number: 6053000
    Abstract: The present invention consists of a refrigeration unit with an adjusting valve that functions to control the flow of refrigerant and which is installed between the condenser and the evaporator. The adjusting valve is modulated by a controller that adjusts the refrigerant flow from the condenser to the evaporator, depending upon the outflow refrigerant vapor pressure coming from the compressor, condenser, or evaporator. Thus, substantial energy losses are avoided.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: April 25, 2000
    Inventors: Mikhail Levitin, Boris Khaytin
  • Patent number: 6044655
    Abstract: A refrigerating system, using CO.sub.2 as a refrigerant, for an air conditioner for an automobile. A pressure at the outlet of the heat emitter 2 is controlled to a target value in accordance with the temperature of the refrigerant at the outlet of the heat emitter for obtaining an operation of the refrigerating system along the optimum control line .eta..sub.max. A pressure reducer 4 and a cooler 5 are provided on a branched passageway 28 branched from a refrigerant recirculating passageway 27 for injection. The cooler 5 is for obtaining a heat exchange between a flow of the refrigerant on the branched passageway 28 after being cooled by the pressure reducer and a flow of the refrigerant on the main passageway 27, thereby cooling the refrigerant directed to the evaporator. In a second aspect of the invention, a means is provided for increasing a target value of the pressure at the pressure reducer when a thermal load of the refrigerating system is high.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: April 4, 2000
    Assignees: Denso Corporation, Nippon Soken
    Inventors: Yukikatsu Ozaki, Yuichi Sakajo, Hisayoshi Sakakibara, Kazuhide Uchida
  • Patent number: 6035653
    Abstract: An air conditioner capable of enhancing responsivity of a blowout temperature of conditioned air while preventing occurrence of an overshoot or undershoot condition of the blowout temperature when a user gives an instruction to change the blowout temperature in a dehumidifying operation mode. In a control state, if a set temperature level is adjusted to increase a blowout temperature of conditioned air by increasing the target condenser outlet temperature, the rotating speed of the refrigerant compressor is increased, while the restriction opening of the heating expansion valve is maintained. Thus, the condenser outlet temperature is regulated to the target temperature with minimal undershoot or overshoot of the target temperature.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: March 14, 2000
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Kunio Iritani
  • Patent number: 6032473
    Abstract: A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: March 7, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Osamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
  • Patent number: 5983657
    Abstract: An air conditioning system having an evaporator 8 at a location upstream from a compressor. When a compressor is stopped, a refrigerant inlet is closed by an electromagnetic valve 28 and a refrigerant outlet is closed by a check valve 29. A pressure in the closed passageway is detected by a pressure sensor 22. A leakage of refrigerant at the evaporator is reliably detected, which allows the leakage of the refrigerant to be quickly noticed.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: November 16, 1999
    Assignee: Denso Corporation
    Inventors: Yoshinori Murata, Hisayoshi Sakakibara, Shin Nishida, Yasutaka Kuroda
  • Patent number: 5934094
    Abstract: A control apparatus for a gas injection type air conditioning system that prevents lowering of compressor speed and cycle stoppage under conditions where high pressure is liable to occur. During a system heating mode, a pressure change rate ASP of the high pressure of the refrigerating cycle is calculated. When a pressure change rate .increment.SP rises above a predetermined value, a system electric expansion valve aperture is reduced. Accordingly, by calculation of the pressure change rate .increment.SP, it is possible to control the electric expansion valve in the above manner earlier than in prior art control schemes when there is a sudden rise in the high pressure.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: August 10, 1999
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Yuji Takeo, Eiji Takahashi, Kunio Iritani
  • Patent number: 5822999
    Abstract: Improved refrigeration system, in particular for domestic use, with a compressor (2), a condenser (3), an evaporator (4) and a valve (5) arranged between the condenser (3) and evaporator (4). The system includes a three-way valve (6) between the condenser (3) and the compressor (2) which establishes a bypass (7) between the compressor (2) and the suction pipe (8) of the system (1) during stoppage of the compressor (2) which blocks the reflux of refrigerant contained in the condenser (3) to the compressor.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: October 20, 1998
    Assignee: Electrolux Espana, S.A.
    Inventor: Miguel Jornet Salo