By Refrigerant Patents (Class 62/184)
  • Patent number: 10674642
    Abstract: According to one embodiment, an electrical equipment housing includes a first storage room, an air conditioner, a second storage room, a temperature sensor, and a heater. The first storage room contains a power converter converting electrical power. The air conditioner adjusts a temperature inside the first storage room. The air conditioner includes an indoor unit and an outdoor unit. The indoor unit is provided inside the first storage room. The outdoor unit is provided outside the first storage room. The second storage room contains the outdoor unit. The temperature sensor senses a temperature inside the second storage room. The heater heats inside the second storage room when the temperature sensed by the temperature sensor is a lower limit or less.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: June 2, 2020
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Nobuhiro Takahashi, Takuo Itami
  • Patent number: 10479170
    Abstract: An air conditioner for a vehicle includes a pump that draws and discharges a heat medium, a cooler core that exchanges sensible heat between the heat medium and ventilation air into a vehicle interior to cool and dehumidify the ventilation air, a heat-medium and outside-air heat exchanger that exchanges sensible heat between the heat medium and outside air, a compressor adapted to draw and discharge a refrigerant in a refrigeration cycle, a heat-medium cooling heat exchanger that cools the heat medium by exchanging heat between a low-pressure side refrigerant in the refrigeration cycle and the heat medium, and first and second switching valves that switch between a first dehumidification mode for circulation of the heat medium between the cooler core and the heat-medium cooling heat exchanger and a second dehumidification mode for circulation of the heat medium between the cooler core and the heat-medium and outside-air heat exchanger.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: November 19, 2019
    Assignee: DENSO CORPORATION
    Inventors: Norihiko Enomoto, Nobuharu Kakehashi, Yasumitsu Omi, Masamichi Makihara, Hiroshi Kishita
  • Patent number: 10451308
    Abstract: A method for reducing energy consumption by a medium heating device, the method comprising the step: scheduling an operation (501) of the first device (111) requiring heating of a first medium; scheduling an operation (502) of the second device (112) requiring heating of a second medium; the method being characterized in that it further comprises the steps of: sending (504), from the first device (111), information regarding its operation cycles and water parameters to the second device (112); rescheduling (505) operations of the liaised devices (111, 112) so that drain heat of the first medium is reused to heat a fresh intake of the second medium by the second device by means of a heat exchanger (160); instructing (506), the reprogrammed devices (111, 112) to start their operations according to the new schedule.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: October 22, 2019
    Assignee: ADVANCED DIGITAL BROADCAST S.A.
    Inventor: Dariusz Cichonski
  • Patent number: 10429108
    Abstract: A method of maintaining a fluid flow rate in a heating, ventilating, air conditioning, and refrigeration (HVAC-R) system while maintaining superheat in the HVAC-R system at a desired level includes: continuously measuring an operating fluid temperature of the HVAC-R system and calculating superheat at a pre-determined rate, determining if the calculated superheat is stable, measuring and recording an operating fluid pressure of the system each time the calculated superheat is stable, recording an average operating fluid pressure each subsequent time the superheat is stable, calculating an output PWM and reducing fluid flow through a metering valve when an actual PWM is greater than the calculated output PWM by adjusting a PWM signal to a microvalve in the metering valve, and increasing fluid flow through the metering valve when the actual PWM is less than the calculated output PWM by adjusting the PWM signal to the microvalve.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: October 1, 2019
    Assignee: DunAn Microstaq, Inc.
    Inventors: Arvind P. Rao, Dhaman Kumar Besarla
  • Patent number: 10126027
    Abstract: A control device, and a method for operating the control device, optimizes cooling of a high-voltage accumulator using an air-conditioning system in a vehicle. A coolant flow which is insufficient is detected by an evaporator for the high-voltage accumulator and, as a result, heat losses inside a condenser of the air-conditioning system are reduced for increasing the flow of the coolant.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: November 13, 2018
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Karsten Berg, Alexander Meijering, Marc-Thomas Eisele, Sebastian Siering, Nicolas Flahaut
  • Patent number: 9797637
    Abstract: A refrigeration cycle apparatus includes a compressor, a condenser, a first subcooling device that subcools a refrigerant by exchanging heat with the air, a second subcooling device that performs a heat exchange between refrigerant streams that have been branched by a branch pipe, thereby subcooling one of the refrigerant streams, a flow control device that adjusts a flow rate of the second stream of the refrigerant and passes this refrigerant through the second subcooling device, a bypass path that allows the refrigerant passing through the flow control device and the second subcooling device to flow therethrough, an expansion valve, an evaporator, and a controller configured to control an amount of heat exchanged in the first subcooling device and an amount of heat exchanged in the second subcooling device based on a temperature of the air.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: October 24, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yusuke Shimazu
  • Patent number: 9657979
    Abstract: A demand-response system includes first and second aggregators and a power aggregator. The first aggregator performs demand-response-related control of a first heating device group including a heat pump device, and the second aggregator performs demand-response related control of a second heating device group. The power aggregator sends a second power adjustment request to the first and second aggregators using a command being common to the first and second aggregators. In accordance with the second power adjustment request, the first aggregator performs demand-response-related control of the first heating device group using a first dedicated command, and the second aggregator performs demand-response-related control of the second heating device group using a second dedicated command that is different from the first dedicated command.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: May 23, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Manabu Yoshimi, Takahiro Yamaguchi, Hiroei Mikami
  • Patent number: 9470451
    Abstract: Provided is a method for controlling an operation of a refrigerator. Different operation modes are selected according to whether a refrigerator door is opened and closed, and according to an inner temperature and an ambient noise. Freezing capacity of a compressor, the number of rotations of an evaporator fan, and the number of rotations of a condenser fan are varied in conjunction with one another, to reduce a noise.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: October 18, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Jindong Kim, Myoungju Kang, Hosan Kim
  • Patent number: 9308800
    Abstract: Disclosed is a control method of an air conditioner system for a vehicle. The air conditioner system is integrated with a cooling system and includes a water-cooled condenser embedded in an intercooler radiator and an air-cooled condenser placed in front of the intercooler radiator. The control method may include (A) circulating the refrigerant in the air conditioner system through actuation of a compressor by sensing actuation of an air conditioner while driving the vehicle in a state in which the start of the vehicle is on, (B) actuating a water pump circulating the cooling water and a cooling fan blowing wind to a cooling module, and (C) controlling the actuation of the compressor by judging whether the vehicle is in a failure mode in a state where the air conditioner is actuated or normally driving the compressor and the cooling fan and ending the control.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 12, 2016
    Assignee: Hyundai Motor Company
    Inventors: Jae Yeon Kim, Dong Won Park
  • Patent number: 9097449
    Abstract: This patent is directed to an external air conditioning system connected to a parked airplane. The system has multiple refrigeration units. Each refrigeration unit has a controller. Each refrigeration unit's controlled is linked to a common controller. A single stream of air flows through all of the evaporators in series. Each of the refrigeration units has multiple compressors. Additional compressors are activated or deactivated based on refrigerant pressure. The activation or deactivation pressures are staggered across the refrigeration units, thus coordinating operation of the multiple refrigeration units.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: August 4, 2015
    Assignee: HOBART BROTHERS COMPANY
    Inventors: Richard Meier, Varun Rajasekaran, Daniel Quinones
  • Publication number: 20150075197
    Abstract: The invention relates to a system that is functionally associated with a refrigeration unit (1), said system comprising a primary tank (6) for the inflow of the water to be treated, and an inner tank (7) for cooling and mixing the water. Said tank (7) contains an exchanger (13) through which the liquid gas from the refrigeration unit (1) is passed, at the same time as the water entering the primary tank (6) accesses the cooling and mixing tank (7) from the primary tank, said cooling and mixing tank comprising water suction tubes (23) that converge in a three-way valve (25) connected to a water recirculation pump (15) via which the water is driven inside the exchanger (13). The treated water leaves via an outflow line (27).
    Type: Application
    Filed: April 15, 2013
    Publication date: March 19, 2015
    Applicant: Atecan Andaluci S.L.
    Inventor: Jessica Gutierrez Muriano
  • Patent number: 8682526
    Abstract: Described herein is a automotive air-conditioning system configured to implement a sub-critical refrigerating cycle and comprising a condenser and a fan associated thereto, a compressor, an evaporator, an expansion valve of the non-electronically-controlled type, and an electronic control system configured to receive a signal indicative of the ambient temperature outside the vehicle and to generate a control signal for the fan of the condenser on the basis of the ambient temperature outside the vehicle.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: March 25, 2014
    Assignee: C.R.F. Societá Consortile per Azioni
    Inventors: Stefano Mola, Carloandrea Malvicino, Domenico Idone
  • Patent number: 8666684
    Abstract: An air conditioning system includes a plurality of indoor units and one or more outdoor units to drive the indoor units. The one or more outdoor units are coupled to the indoor units through refrigerant pipes that include one or more branch points. A calculator calculates an amount of filling refrigerant based on capacities of the indoor units and the one or more outdoor units and lengths of the refrigerant pipes.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: March 4, 2014
    Assignee: LG Electronics Inc.
    Inventors: Seungtae Ko, Sangchul Youn, Chisun Ahn
  • Publication number: 20130098086
    Abstract: A cooling system has a cooling circuit that includes an evaporator disposed in a cabinet, a condenser, a compressor, an electronic expansion valve and a liquid pump. a direct expansion mode and a pumped refrigerant economizer mode. When the cooling system is in the pumped refrigerant economizer mode, the controller controls a temperature of the refrigerant to a refrigerant temperature set point by regulating a speed of a fan of the condenser, controls a temperature of air in a room in which the cabinet is disposed to a room air temperature setpoint by regulating a speed of the liquid pump, and maintains a pressure differential across the liquid pump within a given range by regulating an open position of an electronic expansion valve.
    Type: Application
    Filed: April 13, 2012
    Publication date: April 25, 2013
    Applicant: Liebert Corporation
    Inventors: Stephen Sillato, Timothy J. Schrader, Greg Haggy, Thomas Harvey, Zongtao Lu, John F. Judge
  • Patent number: 8252174
    Abstract: A vehicle-integrated water harvesting system is provided that enables water-vapor or condensation in a vehicle to be captured, and made available onboard the vehicle for drinking or other uses. The system includes a water emitting component and may include a purification system operatively connected to the water emitting component. The purification system at least partially purifies the water and then sends the purified water to a storage reservoir or directly to a dispenser or outlet.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: August 28, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Thomas A. Jones, Therese A. Tant, Gregory A. Major, Frances H. James, Jeffrey M. Pleune
  • Patent number: 8037931
    Abstract: A hybrid heating apparatus heats potable water with waste heat from heat recovery units and insolation from solar collectors. A single circulation pump circulates fluid between at least one heat exchanger and each of the heat recovery units and preferably the solar collector. A single controller receives sensor readings from the heat recovery units and the solar collector units and receives a demand to heat the potable water. To satisfy the demand, the controller determines the extent to which the demand may be satisfied from heat available from the heat recovery units and the solar collector units and sends command signals both to the circulating pump to circulate the fluid and to appropriate ones of valves at connections to those heat recovery units and solar collector units to allow fluid to circulate to be heated to flow to the heat exchanger for effecting heat exchange to heat the potable water.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: October 18, 2011
    Inventors: Krassimire Mihaylov Penev, Gordon Patrick Whelan
  • Patent number: 7963117
    Abstract: An HVAC system for a motorized vehicle or vessel is provided that includes a variable-speed compressor, a variable-speed condenser fan and a variable-speed evaporator fan. The HVAC system further includes a DC-power system for supplying DC power to the variable-speed compressor, the variable-speed condenser fan and the variable-speed evaporator fan regardless if the mobile unit's engine is operating or not operating. A controller and an operator interface are also provided for controlling the operation of the HVAC system.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: June 21, 2011
    Assignee: Dometic Corporation
    Inventors: Kendall Allen, Ralph G. Bailey
  • Patent number: 7797954
    Abstract: In a cooling system, particularly a cooling system for motor vehicles, including a cooling circuit and a refrigerating circuit which are coupled to one another via a refrigerant/coolant heat exchanger and a third medium/coolant heat exchanger arranged in the cooling circuit, a heat source to be cooled is arranged in the cooling circuit and means are provided for controlling the quantity of coolant flowing through the refrigerant/coolant heat exchanger.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: September 21, 2010
    Assignee: Daimler AG
    Inventors: Markus Duhme, Alfred Jeckel
  • Patent number: 7677050
    Abstract: A control device for a fan motor (7) which cools a condenser (6) of a vehicle air conditioner includes a temperature sensor (12) which detects a temperature of an air that has passed through an evaporator (10) of the vehicle air conditioner; and a controller (2). The controller (2) functioning to calculate a reference value (Ds) of an airflow generated by a rotation of the fan motor (7); calculate a correction value (DUP, DUPT) of the airflow on the basis of the detected air temperature (Tair); set a target airflow (TDR) on the basis of the reference value (Ds) and correction value (DUP, DUPT) of the airflow; and control the rotation of the fan motor to effect the target airflow (TDR).
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: March 16, 2010
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shigeyuki Sakaguchi, Makoto Fukubayashi, Yoichiro Nakahara, Tomofumi Furukawa
  • Patent number: 7426837
    Abstract: A refrigerator includes a compressor compressing a refrigerant, a first liquid heat exchanger performing heat exchange between the refrigerant and a first liquid heat medium, an expander expanding the refrigerant, a second liquid heat exchanger performing heat exchange between the refrigerant and a second liquid heat medium, an air heat exchanger performing heat exchange between the refrigerant and air, a blower sending air to the air heat exchanger, a refrigerant flow rate regulator regulating a flow rate of the refrigerant of the first liquid heat exchanger, the second liquid heat exchanger and the air heat exchanger, a pressure sensor detecting a pressure value of the refrigerant of the air heat exchanger, a target pressure value setter setting a target pressure value of the refrigerant of the air heat exchanger in accordance with a target temperature value of the first liquid heat medium, and a blower controller controlling the blower so that the detection value of the pressure sensor becomes the target p
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: September 23, 2008
    Assignee: Daikin Industries, Ltd.
    Inventors: Koji Hayashi, Kenji Kinokami, Toshiyuki Momono
  • Publication number: 20080078192
    Abstract: A refrigeration system can incorporate a cooling-liquid injection system that can inject a cooling liquid into an intermediate-pressure location of the compressor. The cooling liquid can absorb the heat of compression during the compression of the refrigerant flowing therethrough. The refrigeration system can include an economizer system that injects a refrigerant vapor into an intermediate-pressure location of the compressor in conjunction with the injection of the cooling liquid. A refrigeration system can include a liquid-refrigerant injection system that can inject liquid refrigerant into an intermediate-pressure location of the compressor. The injected liquid refrigerant can reduce the discharge temperature of the refrigerant. The liquid-refrigerant injection system can be used with the cooling-liquid injection system and/or the economizer system.
    Type: Application
    Filed: February 19, 2007
    Publication date: April 3, 2008
    Inventors: Kirill Ignatiev, Jean-Luc M. Caillat
  • Patent number: 7347056
    Abstract: A vehicle air-conditioning system provided with a refrigeration cycle system is provided. The air-conditioning system includes an evaporator outlet air target temperature setting unit which sets the target temperature of air at an outlet of an evaporator at a predetermined temperature greater than or equal to a minimum temperature which is set for preventing freezing of the evaporator. The target temperature setting unit controls the predetermined temperature to the minimum temperature when the vehicle speed is lower than or equal to a predetermined vehicle speed.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: March 25, 2008
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hiroshi Anyoji, Satoshi Horiguchi, Masahiro Takagi, Takayuki Iio
  • Patent number: 6862894
    Abstract: A water-cooled auxiliary condenser device 200 receives refrigerant from an external refrigeration system 210 just downstream from its air-cooled condenser 110. The refrigerant passes through a water-cooled condenser 250, and the refrigerant state is sensed by a temperature or pressure sensor 226. If the sensed state of the refrigerant rises above a first threshold, the flow of water through the water-cooled condenser 250 is increased, e.g., turned ON, using a controllable water valve 234. When the sensed state of the refrigerant drops below a second threshold, the water flow through the water-cooled condenser 250 is decreased, e.g., turned OFF. The refrigerant returns to the refrigeration system just upstream from its liquid receiver 120. In the event that air-cooled condenser 110 fails, device 200 automatically activates the water-cooled condenser 250 to maintain safe refrigeration temperatures in the appliance. When not required, device 200 remains passive and does not use any water or electric.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: March 8, 2005
    Inventor: Donald R. Miles
  • Patent number: 6755038
    Abstract: Multi-unit air conditioner and method for controlling the same, the multi-unit air conditioner including a plurality of outdoor heat exchangers, a plurality of outdoor fans for cooling the outdoor heat exchangers, and control means for controlling rotation speeds of the outdoor fans, to control a gas/liquid refrigerant mixing ratio introduced into the gas-liquid separator through the outdoor heat exchangers, thereby optimizing the mixing ratio of the refrigerant introduced to a gas-liquid separator proper to an operation condition, for improving an air conditioning efficiency.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: June 29, 2004
    Assignee: LG Electronics Inc.
    Inventor: Il Nahm Hwang
  • Patent number: 6711909
    Abstract: An outdoor unit includes a pulse width modulation compressor, an outdoor heat exchanger. First and second outdoor fans are positioned near to the outdoor heat exchanger. The operation modes of the first and second outdoor fans are determined in accordance with the amount of refrigerant discharged from the compressor and external conditions. An outdoor temperature sensor is electrically connected to the input port of the outdoor control unit, and first and second outdoor fan operating units for respectively operating first and second outdoor fans are connected to the output port of the outdoor control unit. The outdoor control unit operates the first and second fans in a preset operation mode by confirming outdoor temperature data input from the outdoor temperature sensor and the loading time of the compressor and controlling the first and second outdoor fan operating units.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: March 30, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joong-Ki Moon, Young-Man Kim, Jae-Myoung Moon, Jung-Min Lee, Jong-Youb Kim, Il-Yong Cho
  • Publication number: 20040040319
    Abstract: The present invention provides a cooling fan control device configured to use a single cooling fan instead of a double cooling fan for cooling an air conditioner and a radiator. The cooling fan control device comprises a vehicle operation state detecting unit; an electronic control unit to output a cooling fan control signal according to a preset program; a first power supply unit for supplying a high fan speed driving power to a cooling fan motor; and a second power supply unit for supplying a low fan speed driving power to the cooling fan motor according to the cooling fan control signal output from the electronic control unit.
    Type: Application
    Filed: June 18, 2003
    Publication date: March 4, 2004
    Inventor: Jong-Wuk Lee
  • Patent number: 6698220
    Abstract: In an automotive air conditioning system according to the present invention, a thin condenser 2 of a condensing unit portion 10 installed on a flat roof of a vehicle such as a bus is provided in such a manner as to be inclined downwardly from the front toward the rear of the vehicle, condenser fans 4 are provided directly above the condenser, and an air inlet 51 to the condenser is disposed in front of the condenser whereas air outlets 52 are disposed above the condenser.
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: March 2, 2004
    Assignee: Denso Corporation
    Inventors: Tsuyoshi Yoneno, Atsushi Hasegawa, Yukihiro Hirose, Hiroshi Kamiya
  • Publication number: 20030230100
    Abstract: Multi-unit air conditioner and method for controlling the same, the multi-unit air conditioner including a plurality of outdoor heat exchangers, a plurality of outdoor fans for cooling the outdoor heat exchangers, and control means for controlling rotation speeds of the outdoor fans, to control a gas/liquid refrigerant mixing ratio introduced into the gas-liquid separator through the outdoor heat exchangers, thereby optimizing the mixing ratio of the refrigerant introduced to a gas-liquid separator proper to an operation condition, for improving an air conditioning efficiency.
    Type: Application
    Filed: June 12, 2003
    Publication date: December 18, 2003
    Applicant: LG ELECTRONICS INC.
    Inventor: Il Nahm Hwang
  • Publication number: 20030159450
    Abstract: In an automotive air conditioning system according to the present invention, a thin condenser 2 of a condensing unit portion 10 installed on a flat roof of a vehicle such as a bus is provided in such a manner as to be inclined downwardly from the front toward the rear of the vehicle, condenser fans 4 are provided directly above the condenser, and an air inlet 51 to the condenser is disposed in front of the condenser whereas air outlets 52 are disposed above the condenser.
    Type: Application
    Filed: February 26, 2003
    Publication date: August 28, 2003
    Inventors: Tsuyoshi Yoneno, Atsushi Hasegawa, Yukihiro Hirose, Hiroshi Kamiya
  • Publication number: 20030084673
    Abstract: An outdoor unit includes a pulse width modulation compressor, an outdoor heat exchanger. First and second outdoor fans are positioned near to the outdoor heat exchanger. The operation modes of the first and second outdoor fans are determined in accordance with the amount of refrigerant discharged from the compressor and external conditions. An outdoor temperature sensor is electrically connected to the input port of the outdoor control unit, and first and second outdoor fan operating units for respectively operating first and second outdoor fans are connected to the output port of the outdoor control unit. The outdoor control unit operates the first and second fans in a preset operation mode by confirming outdoor temperature data input from the outdoor temperature sensor and the loading time of the compressor and controlling the first and second outdoor fan operating units.
    Type: Application
    Filed: January 3, 2002
    Publication date: May 8, 2003
    Inventors: Joong-Ki Moon, Young-Man Kim, Jae-Myoung Moon, Jung-Min Lee, Jong-Youb Kim, Il-Yong Cho
  • Publication number: 20030074908
    Abstract: A control method and device for controlling the operation of various components of a refrigeration system provides more efficient operation of those components. Energization of the compressor is delayed upon power interruption, and high pressure is relieved through operation of a valve. The compressor runs is energized if the cabin temperature exceeds a specified temperature for a predetermined length of time, is is de-energized if the cabin temperature drops below a specified temperature. The condenser fan is energized based on the temperature of the condenser coil inlet and the ambient temperature. The evaporator fan is energized based on the cabin temperature and the temperature of the evaporator coil outlet.
    Type: Application
    Filed: October 24, 2001
    Publication date: April 24, 2003
    Inventor: Philip L. Baker
  • Patent number: 6526768
    Abstract: An apparatus and method for controlling the temperature of an integrated circuit device includes a refrigerant system having a coolant loop containing refrigerant, an evaporator, a compressor, and a condenser. The condenser has a variable speed fan controlled to maintain the temperature of the refrigerant at a predetermined value. In a refrigeration system used to cool an integrated circuit device, a method for controlling refrigerant pressure by comparing the refrigerant temperature at a predetermined location to a predetermined value and varying the cooling applied to the condenser.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: March 4, 2003
    Assignee: Kryotech, Inc.
    Inventors: Charles B. Wall, Terry Craps, Charles R. Schmidt, Matthew F. W. Brown
  • Publication number: 20030019235
    Abstract: An apparatus and method for controlling the temperature of an integrated circuit device includes a refrigerant system having a coolant loop containing refrigerant, an evaporator, a compressor, and a condenser. The condenser has a variable speed fan controlled to maintain the temperature of the refrigerant at a predetermined value. In a refrigeration system used to cool an integrated circuit device, a method for controlling refrigerant pressure by comparing the refrigerant temperature at a predetermined location to a predetermined value and varying the cooling applied to the condenser.
    Type: Application
    Filed: July 24, 2001
    Publication date: January 30, 2003
    Inventors: Charles B. Wall, Terry Craps, Charles R. Schmidt, Matthew F.W. Brown
  • Patent number: 6467288
    Abstract: In a heat-pump water heater, a control unit has a heat-radiation determining means for determining a heat radiation from refrigerant to outside air in an air heat exchanger based on a water temperature flowing into a water heat exchanger, and the control unit selectively performs a general cycle operation and a bypass operation in accordance with a determination result of the heat-radiation determining means. That is, when the water temperature flowing into the water heat exchanger is lower than 60° C., the general cycle operation is performed. On the other hand, when the water temperature is equal to or higher than 60° C., the bypass operation is performed.
    Type: Grant
    Filed: June 27, 2001
    Date of Patent: October 22, 2002
    Assignees: Denso Corporation, Tokyo Electric Power Company, Central Research Institute of Electric Power Industry
    Inventors: Jyouji Kuroki, Hisayoshi Sakakibara, Tomoaki Kobayakawa, Kazutoshi Kusakari, Michiyuki Saikawa
  • Patent number: 6415746
    Abstract: In apparatus and method for controlling a cooling fan associated motor at a pulse duty ratio, the cooling fan is revolved by the cooling fan associated motor to cool a radiator of a vehicular engine coolant and a condenser of a refrigerant of a vehicular air conditioner and the duty ratio for the cooling fan associated motor is controlled in such a manner that a sum of a torque required for a generator to drive the cooling fan associated motor and a torque required to drive a compressor of the air conditioner is minimized while satisfying a control demand for a coolant temperature and a refrigerant pressure so that the cooling fan associated motor is driven at the duty ratio.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: July 9, 2002
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kazuhira Kobayashi, Tomofumi Furukawa
  • Patent number: 6397610
    Abstract: An air conditioner/heater automatically operates in either air conditioning or heating mode by coil temperatures of indoor and outdoor heat exchangers. In air conditioning mode, the rotating speed of indoor fan motor is proportional to the ambient temperature of corresponding enclosed space, and the rotating speed of outdoor fan motor is proportional to the coil temperature of corresponding outdoor heat exchanger. In heating mode, the rotating speed of indoor fan motor is proportional to the coil temperature of corresponding indoor heat exchanger, and the rotating speed of outdoor fan motor is inversely proportional to the coil temperature of corresponding outdoor heat exchanger. With this automatic switching of operation mode, the capability of heat dissipation of condenser is always larger than the capability of heat absorption of evaporator. Hence, the operation of the air conditioner/heater is maintained at an optimum.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: June 4, 2002
    Assignee: Cohand Technology Co., Ltd.
    Inventors: Kuo-Liang Weng, Ming-Tsun Ke, Jing-Wen Weng
  • Patent number: 6339933
    Abstract: In a device for air conditioning a motor-vehicle passenger compartment, a control module adjusts electrical power supplied to a motor-driven fan unit delivering airflow to a condenser of the device. Means are furthermore provided for recording an air throughput passing over the condenser and produced, at least in part, by the motor-driven fan unit. A regulation module estimates a maximum value of the electrical power supply to the motor-driven fan unit, for a given air throughput, with a view to limiting the electrical power supply to this maximum value, as a function of the air throughput.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: January 22, 2002
    Assignee: Valeo Climatisation
    Inventors: Bruno Hamery, Jin Ming Liu
  • Patent number: 6202430
    Abstract: In a heating and air conditioning installation for a motor vehicle, the refrigerant fluid circuit includes a cooling (air conditioning) loop including a condenser, and a heating loop. In order to detect excess pressure in the refrigerant fluid in the condenser, during corrective discharges of the fluid to the condenser from the heating loop, the frequency of occurrence of these discharges is monitored continuously, and an evaluation is made as to whether the measured frequency exceeds a threshold value. The outlet pressure of the compressor is also monitored continuously, an evaluation being made as to whether the measured pressure exceeds a predetermined demand pressure by an excess value over a given period of time.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: March 20, 2001
    Assignee: Valeo Climatisation
    Inventor: Stefan Karl
  • Patent number: 6196010
    Abstract: A temperature control zone enclosure for exterior compressor/condensers has been developed to serve as a means of protecting the compressor/condensers from inclement weather and to automatically allow those units to operate at optimum temperature. The enclosure is comprised of a back, two sides and partial front and top walls with rigid insulation sandwiched between an outer and inner layer of material impervious to atmospheric conditions. The majority of the front and slanted top of the enclosure is comprised of two movable dual-glazed panels. Those movable panels are equipped with automatically operating interior light-reflecting horizontal slat blinds that change position in concert with the moveable dual-glazed panels that are operated by a non-electric temperature sensing operating device connected to the panels by a set of fulcrum advantaged rigid members activated as temperatures rise or fall within the enclosure.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: March 6, 2001
    Inventor: John Harry Mohrman
  • Patent number: 6161394
    Abstract: This invention provides a refrigeration system which includes in a closed loop connection a compressor for compressing a refrigerant into a condenser for condensing the compressed refrigerant into a liquid refrigerant, a control valve to controlling the discharge of the liquid refrigerant from the condenser into a reservoir, a sensor for measuring the temperature of the liquid refrigerant near the control valve, a fan for circulating air thorough the condenser, a sensor for measuring the ambient temperature of the air flow through the condenser, and an electronic control system to control various functions of the refrigeration system, including the flow of the liquid refrigerant through the condenser as function of the temperature difference between the ambient temperature and the temperature of the liquid refrigerant. During operation, a minimal flooding of the condenser is always maintained; i.e.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: December 19, 2000
    Assignee: Altech Controls Corp.
    Inventor: Richard H. Alsenz
  • Patent number: 6055819
    Abstract: A method for preventing an evaporator of an air conditioner from freezing comprises the steps of (1) detecting an outdoor temperature, (2) determining whether or not the outdoor temperature is 20.degree. C., (3) determining whether or not the outdoor temperature is in a first temperature range, (4) determining whether or not the outdoor temperature is in a second temperature range, (5) varying an R.P.M. of the motor assembly based on the outdoor temperature detected in steps (3) and (4), (6) detecting a surface temperature of a condenser and determining whether or not the surface temperature of the condenser is in a third temperature range, (7) repeating steps (1) through (6) if the surface temperature of the condenser is higher than the third temperature range, and (8) rotating the motor assembly at a low speed if the surface temperature of the condensor is lower than the third temperature range.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: May 2, 2000
    Assignee: Daewoo Electrics Co., Ltd.
    Inventor: Hoon Kang
  • Patent number: 5927087
    Abstract: In a refrigerating cycle (air conditioner) using mixture refrigerant, a mixing ratio of the refrigerant in a refrigerant circuit is measured by a mixing ratio detector, and a controller receives the detection signal to open a control valve when the mixing ratio of a high boiling-point refrigerant component is low, whereby the high boiling-point refrigerant stocked in a liquid reservoir is returned to the refrigerant circuit. The high boiling-point refrigerant which is supplied from the liquid reservoir through the opening operation of the control valve is supplied from a low pressure side of a compressor into the refrigerant circuit to keep the mixing ratio of the refrigerant circulating in the refrigerant circuit to a predetermined value, thereby preventing abnormal increase of pressure of the refrigerant due to variation of the mixing ratio.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: July 27, 1999
    Inventor: Atuyumi Ishikawa
  • Patent number: 5901786
    Abstract: A cooling module for an automotive vehicle is disclosed. The module includes a pair of bypass doors for directing a flow of air around either of the condenser or radiator in the module depending upon the demands for engine cooling, air conditioning, and any other cooling requirements. Under suitable conditions, the radiator bypass feature or the condenser bypass feature will open, providing additional cooling for the condenser or radiator respectively, in order to satisfy given cooling requirements more efficiently.
    Type: Grant
    Filed: September 21, 1998
    Date of Patent: May 11, 1999
    Assignee: Ford Motor Company
    Inventors: Upendra Patel, Ajit Ravindra Shembekar, James Alan Acre
  • Patent number: 5873257
    Abstract: A method of preventing compressor surge in an air conditioning system comprises: 1) determining the refrigerant flow rate at the compressor; 2) determining the input pressure and output pressure at the compressor; 3) determining the pressure ratio (output pressure/input pressure) at the compressor; 4) defining a surge limit based upon the pressure ratio and the refrigerant flow rate; 5) processing system operational inputs including motor speeds and air conditioning pressures; and 6) sending control signals to the air conditioning system to control the refrigerant flow rate and the pressure ratio in a manner to prevent compressor operation at the defined surge limit and to maximize compressor efficiency during transitional periods. An air conditioning system is also provided, as well as an article of manufacture for use with the system for preventing compressor surge.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: February 23, 1999
    Assignee: Smart Power Systems, Inc.
    Inventor: Gregory E. Peterson
  • Patent number: 5806330
    Abstract: A thermistor probe is formed in a closed end tube and the probe is inserted through the header of a receiver/drier in a refrigeration system for sensing the temperature of the saturated refrigerant vapor in the receiver/drier. The sensed temperature is employed to energize and de-energize the refrigerant pump or compressor. The sensed temperature is also employed to energize and de-energize the refrigerant condenser fan motor.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: September 15, 1998
    Assignee: Eaton Corporation
    Inventors: Francis Falkowski, Dennis K. Seals, James L. Bedore, Wayne K. Hutchison
  • Patent number: 5799867
    Abstract: An engine-driven heat pump apparatus having a refrigerant circulation line which includes at least one inside heat-exchanger for exchanging heat between the air in a room and the refrigerant, and a pressure-controlling device for substantially maintaining the pressure on the high pressure side of the refrigerant circulation line by, for example, narrowing the opening of the expansion valve(s), decreasing the volume of air passing through the inside heat-exchanger(s), recirculating the air passing through the inside heat-exchanger(s), lowering the heat efficiency of the engine when the required quantity of radiated heat from the inside heat-exchanger(s) in use is increased, e.g., when the number of inside heat-exchanger(s) in use is increased, thereby maintaining or increasing heating power in the heating mode, irrespective of the number of inside heat-exchangers in use.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: September 1, 1998
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Makoto Misawa
  • Patent number: 5778691
    Abstract: According to the present invention, in a gas injection type heat pump apparatus, the high-pressure side pressure of refrigeration cycle is detected in a heating operation, and an upper limit value of an amount of air passing through an inside heat exchanger is determined based on the detection value. The upper limit value and a set air amount set by an air amount switching lever are compared. When the set air amount is larger than the upper limit value, the amount of the air passing through the inside heat exchanger is restricted within the upper limit value. In this way, the high-pressure side pressure increases, and an intermediate pressure in a gas-liquid separator also increases. Therefore, the gas injection amount can be increased, and a heating capacity can be effectively improved.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: July 14, 1998
    Assignee: Denso Corporation
    Inventors: Takahisa Suzuki, Yuuji Takeo, Yukikatsu Ozaki
  • Patent number: 5776934
    Abstract: 1,3,5-Triazine-2,4,6-tris-alkylaminocarboxylic acid derivatives of the general formula (I): 1,3,5-triazine-2,4,6-tris?NH--(CH.sub.2).sub.n --CO--O--R.sup.1 ! are employed as biocidal or biostatic agents in aqueous systems, in particular in cooling lubricants. Fungicides, for example pyrithione or derivatives thereof and/or N-alkyl-diazenium dioxide salts, can be added to the aqueous systems. 0.05 to 0.40% by weight of the 1,3,5-triazine-2,4,6-alkylaminocarboxylic acid derivatives and 0.0001 to 0.2% by weight of fungicides are sufficient to maintain the biocidal or biostatic actions.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: July 7, 1998
    Assignee: CG-Chemie GmbH
    Inventors: Jorg Lesmann, Hermann Georg Schafer
  • Patent number: 5752389
    Abstract: An air conditioning apparatus, capable of cooling, dehumidifying, and reheating air, using refrigeration reheat. The apparatus comprises rooftop unit (1), which includes a standard refrigeration loop for cooling operation. A multiple circuit reheat coil (54), is added in a parallel arrangement with outdoor coil (34), with respect to refrigerant flow. A portion of the hot refrigerant gas of the system is diverted through reheat coil (54) during dehumidification mode, to reheat the supply air to room temperature. A multiple step discharge air control system is included to control multiple stop valves (52) during the dehumidification mode. Reheat coil (54) is arranged in series air flow relationship with evaporator coil (46), so that a mixture of any proportion of outside air and return air may be conditioned. A pressure control (28) is provided to maintain system pressure during all modes of operation.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: May 19, 1998
    Inventor: Thomas H. Harper
  • Patent number: 5692387
    Abstract: A refrigeration system includes in a closed loop connection a compressor for compressing a refrigerant, a desuperheater for cooling the hot compressor discharge gas via the injection of liquid refrigerant, and a condenser for condensing the compressed, desuperheated refrigerant into a liquid refrigerant. The liquid refrigerant is injected into the compressed refrigerant by utilizing a liquid column for supplying pressure to the liquid refrigerant for injecting liquid refrigerant into the compressed refrigerant without using a mechanical pump. Another method of injecting the liquid refrigerant into the compressed refrigerant is to use a venturi pump at the injection point to supply the liquid refrigerant for injection into the compressed refrigerant. The desuperheater causes the temperature of the hot refrigerant vapor leaving the compressor to be reduced from a superheated condition to temperature closer to its condensing temperature prior to its entry to the condenser.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: December 2, 1997
    Assignee: Altech Controls Corporation
    Inventors: Richard H. Alsenz, Timothy G. Burns, Bryan J. Rees