Defrosting Patents (Class 62/151)
  • Patent number: 10520233
    Abstract: An air-conditioning apparatus is capable of efficiently performing defrosting operation without suspending a heating operation of an indoor unit. The air-conditioning apparatus includes a main circuit sequentially connecting, via a pipe, a compressor, indoor heat exchangers, first flow control devices, and a plurality of parallel heat exchangers connected in parallel to each other to allow refrigerant to circulate, first defrost pipes branching a part of the refrigerant discharged from the compressor and causing the part of the refrigerant to flow into one of the plurality of parallel heat exchangers to be defrosted, an interface heat exchanger located between the plurality of parallel heat exchangers, a first bypass pipe branching a part of the refrigerant discharged from the compressor and causing the part of the refrigerant to flow into the interface heat exchanger, and a second bypass pipe causing the part of the refrigerant flowing out of the interface heat exchanger to flow into the main circuit.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: December 31, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuya Watanabe, Shinichi Wakamoto, Naofumi Takenaka, Naomichi Tamura, Tadashi Ariyama, Koji Yamashita, Takeshi Hatomura
  • Patent number: 10222081
    Abstract: A controller is configured to decide whether liquid refrigerant is unevenly distributed among a plurality of outdoor units and then adjust an outlet subcooling degree of an outdoor heat exchanger or an outlet sub cooling degree at a high-pressure outlet of a high-low pressure heat exchanger, and a discharge superheating degree of a compressor in a low capacity-side outdoor unit to match lower heat exchange capacity of the outdoor heat exchanger in the low capacity-side outdoor unit with higher heat exchange capacity of an outdoor heat exchanger in a high capacity-side outdoor unit, the low capacity-side outdoor unit being one of the plurality of outdoor units in which the outdoor heat exchanger has the lower heat exchange capacity, the high capacity-side outdoor unit being another of the plurality of outdoor units in which the outdoor heat exchanger has the higher heat exchange capacity.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: March 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kazuhisa Iwasaki
  • Patent number: 10211767
    Abstract: An integrated circuit includes a motor current input voltage-to-current (VI) converter that receives a motor current sensor voltage from a motor and a reference voltage to generate an output current related to a motor's current. A motor current calibration VI converter compensates for errors in the motor current input VI converter and generates a calibration output current based on the reference voltage, wherein the output current and the calibration output current are combined to form an estimate of the motor's current.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: February 19, 2019
    Assignee: Texas Instruments Incorporated
    Inventors: Qunying Li, Juergen Luebbe, Robert E. Whyte, Jr.
  • Patent number: 10168088
    Abstract: An air conditioning device includes a main refrigerant circuit and a discharge-intake bypass circuit. The refrigerant circuit is operable in a heating mode and a positive cycle defrosting mode. It is possible for refrigerant to bypass from a discharge side to an intake side of the compressor when the refrigerant circuit is operating in the heating mode. The refrigerant circuit is operable in a positive cycle defrosting mode. When the refrigerant circuit is operating in the positive cycle defrosting mode, a superheat valve of the discharge-intake bypass circuit is opened and the refrigerant is caused to bypass from the discharge side to the intake side of the compressor through the bypass circuit and a defrosting-mode main valve high-pressure control is performed to adjust a valve opening of a main valve so that a high pressure level of a refrigerating cycle in the refrigerant circuit reaches a target high pressure.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: January 1, 2019
    Assignee: Daikin Industries, Ltd.
    Inventors: Hayato Nuno, Tomoyuki Haikawa
  • Patent number: 10139144
    Abstract: A controller of an air conditioning apparatus performs a start/stop frequency-reducing rotation speed control in which the rotation speed of a compressor is controlled based on request values from indoor units requesting a decrease in air conditioning capacity, disregarding request values from indoor units requesting an increase in air conditioning capacity, when each indoor temperature at all indoor units performing air conditioning operation is within a scope of a prescribed threshold temperature range surrounding a target indoor temperature at each indoor unit performing air conditioning operation.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: November 27, 2018
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiyuki Tsuji, Yasushi Hori, Mariko Takakura, Yuusuke Oka
  • Patent number: 10094610
    Abstract: A refrigerator includes a cabinet defining a storage compartment and a door movably coupled to the cabinet for providing selective access to at least a portion of the storage compartment. The refrigerator includes an evaporator unit and an air duct providing fluid communication between the evaporator unit and the storage compartment. The refrigerator includes a partition member coupled to the cabinet that divides the storage compartment into a first compartment having a first volume and a second compartment having a second volume. The partition member is movable between a first position and a second position to adjust the first and second volumes. The partition member can include an air channel extending through the partition member that is in fluid communication with at least one of the first and second compartments. The partition member can include a baffle member that is adjustable to adjustably direct air passing through the air channel.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: October 9, 2018
    Assignee: Electrolux Home Products, Inc.
    Inventors: Terry Lynn Sexton, Jason Lee Purucker, Caleb Gossens
  • Patent number: 9834063
    Abstract: A heat pump system for a vehicle, which makes refrigerant bypass an external heat exchanger and turns off a fan mounted on the external heat exchanger when temperature of the outdoor air is lower than setting temperature and the vehicle enters into an idle state in a heat pump mode, thereby continuously operating the heat pump mode even in the below zero temperature so as to keep heating performance, reducing consumption of electrical power without needing to operate an electric heater, and preventing excessive noise of a fan when the vehicle enters into an idle state in the below zero temperature.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: December 5, 2017
    Assignee: HANON SYSTEMS
    Inventors: Sung Ho Kang, Hak Kyu Kim, Sang Ki Lee, Jae Min Lee, Young Ho Choi
  • Patent number: 9829210
    Abstract: An air-conditioning apparatus includes a refrigerant circuit formed by connecting, with pipes, a compressor, a first refrigerant flow switching device, a heat-source-side heat exchanger, an expansion device, and a plurality of intermediate heat exchangers. A heat medium circuit is formed by connecting, with pipes, a plurality of pumps configured to pressurize and circulate the heat medium subjected to heat exchange in the plurality of intermediate heat exchangers, a plurality of use-side heat exchangers each configured to exchange heat between the heat medium and air in an air-conditioned space, and a heat-medium flow switching/control device configured to switch which of the heat medium is to be allowed to flow into and out of each of the use-side heat exchangers; and a controller configured to perform processing for controlling the switching performed by the heat-medium flow switching/control device, in accordance with a capacity of each of the use-side heat exchangers.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: November 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Motomura, Naofumi Takenaka, Shinichi Wakamoto, Hirofumi Koge, Osamu Morimoto
  • Patent number: 9783721
    Abstract: The present invention relates, in part, to heat transfer compositions and methods that include (a) from about 65% to about 75% by weight of HFC-32; (b) from about 15% to about 35% by weight of a compound selected from unsaturated —CF3 terminated propenes, unsaturated —CF3 terminated butenes, and combinations of these; and (c) from greater than about 0% to less than about 10% by weight of CO2, provided that the amount of component (c) is effective to improve heating capacity of the composition and reduce the defrost cycle in refrigerant applications, as compared to compositions lacking this component.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: October 10, 2017
    Assignee: HONEYWELL INTERNATIONAL INC.
    Inventors: Mark W. Spatz, Ankit Sethi, Samuel F. Yana Motta, Elizabet Del Carmen Vera Becerra
  • Patent number: 9696074
    Abstract: A refrigerant compression system and method for controlling a refrigerant compression system are described. In some aspects, the refrigerant compression system includes a compressor system having a plurality of compression stages, a plurality of quench valves, a first suction temperature control circuit associated with a first quench valve, a second suction temperature control circuit associated a second quench valve, and a discharge temperature control circuit associated with a plurality of the quench valves. Quench valve settings are determined based on evaluation of one or more outputs from the suction temperature control circuits and the discharge temperature control circuit.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: July 4, 2017
    Assignee: Woodward, Inc.
    Inventors: Nicola Ceccarelli, Jean Philippe Monge, Alex Benim
  • Patent number: 9638430
    Abstract: In an air-conditioning apparatus, when a plurality of pumps are all operating and a heat exchange amount in use-side heat exchangers is equal to or lower than a lower limit of a thermal capacity that can be conveyed in a heat medium circuit B, before at least one of the plurality of pumps is stopped, a refrigerant flow path in the intermediate heat exchanger connected to the pump that is to be stopped is closed. Then, the at least one of the plurality of pumps is stopped, and the thermal capacity required in at least one of the use-side heat exchangers in the rest of the plurality of pumps is conveyed.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: May 2, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Motomura, Daisuke Shimamoto, Takayoshi Honda, Osamu Morimoto, Koji Nishioka, Tatsuo Ono
  • Patent number: 9464840
    Abstract: A gas defrosting system is disclosed for efficiently defrosting refrigeration units using fluid-cooled condensers. For each refrigeration unit in refrigeration mode, a cool condenser fluid is applied to the condenser to achieve a high thermodynamic efficiency. For each refrigeration unit in defrost mode, a warm defrost fluid is applied to the condenser to expedite the defrost process.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: October 11, 2016
    Assignee: Hill Phoenix, Inc.
    Inventor: James Boyko
  • Patent number: 9191996
    Abstract: A heater apparatus divides a heater capacity (heater wire), connects the divided heater wire portions to each other outside the a heat insulating layer, changes a connection mode irrespective of which of a 100 V system or a 200 V system is used as a supply voltage, and thereby suppresses a heater temperature to within a safe range even in a continuous current conduction mode, and uses a common heater and suppress management cost. Furthermore, since the heater wire portions are connected to each other outside the heat insulating layer for the heater embedded in the heat insulating layer of a refrigerator, the heater apparatus is capable of reducing production loss due to misconnections and using a common heater.
    Type: Grant
    Filed: December 24, 2010
    Date of Patent: November 17, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Satoshi Miyamoto
  • Publication number: 20150135749
    Abstract: A flow rate regulation valve is used for a refrigeration cycle device for air conditioning. The flow rate regulation valve is constituted by: an inlet flow rate control valve connected to the inlet side of an inside evaporator and functioning in the refrigeration cycle device as an expansion valve for depressurizing and expanding a refrigerant flowing into the inside evaporator; and an outlet flow rate adjustment valve connected to the outlet side of the inside evaporator and functioning as an evaporation pressure adjustment valve for adjusting evaporation pressure in the inside evaporator to a predetermined target pressure at which frost is not formed. The flow rate regulation valve is characterized in that, when the opening of one of the inlet flow rate control valve and the outlet flow rate adjustment valve increases, the flow rate regulation valve displaces so that the opening of the other decreases.
    Type: Application
    Filed: April 30, 2013
    Publication date: May 21, 2015
    Inventor: Hiromi Ohta
  • Patent number: 9032751
    Abstract: A system and method for controlling automatic defrost of a refrigerator device adaptively moves the defrost cycle to a time period of comparatively low compressor activity based on an evaluation of compressor usage over a cyclically recurring time interval. An adaptive defrost controller (ADC) analyzes stored data to develop a profile for compressor activity vs. time. From this profile, high compressor activity times of the time interval are distinguished from low compressor activity times in the time interval and a defrost cycle is scheduled based on the results of the analyzed data.
    Type: Grant
    Filed: October 21, 2009
    Date of Patent: May 19, 2015
    Assignee: Diehl AKO Stiftung & Co. KG
    Inventors: Kevin Lacey, Robert Alvord, Jim Kopec
  • Publication number: 20150121913
    Abstract: During heat applying operation, both an air-source heat exchanger that exchanges heat with the atmosphere as a heat source and an earth-source heat exchanger that uses geothermal heat as a heat source serve as evaporators to collect heat from the atmosphere and the geothermal heat. During defrosting operation, while a four-way valve is switched to cause the air-source heat exchanger to serve as a radiator, and the earth-source heat exchanger to serve as an evaporator to collect the geothermal heat, and the collected geothermal heat is collected in the main circuit via the sub-circuit.
    Type: Application
    Filed: April 24, 2013
    Publication date: May 7, 2015
    Inventors: Yohei Kato, Yoshiro Aoyagi
  • Publication number: 20150121925
    Abstract: Provided is a refrigerator. The refrigerator may include a power supply unit configured to power the refrigerator using commercial power, a battery coupled to the power supply unit and configured to supply auxiliary power to the refrigerator, a power detection unit coupled to the power supply unit and the battery and configured to detect whether power is being supplied from the power supply unit, a driving unit to provide cold air, and a controller configured to control an operational mode of the driving unit based on the detection at the power detection unit. When the power supply unit is supplying power, the driving unit may be controlled to operate in a normal operation mode, and when the power supply unit is not supplying power, the driving unit may be controlled to operate in a power failure operation mode and to control the power to be supplied from the battery.
    Type: Application
    Filed: November 5, 2014
    Publication date: May 7, 2015
    Inventors: Shinhyun PARK, Sun KIM, Byoungsuk CHOI
  • Patent number: 9016077
    Abstract: A refrigerator includes a low-temperature storage compartment damper to control supply of cool air to a low-temperature storage compartment, a high-temperature storage compartment damper to control supply of hot air to a high-temperature storage compartment, and a controller to control the low-temperature storage compartment damper to be opened and the high-temperature storage compartment damper to be closed while controlling a compressor and blowing fan to be driven so that the temperature of the low-temperature storage compartment reaches a low set temperature, to control the driving of the compressor and blowing fan to be stopped and the low-temperature storage compartment damper to be closed when the temperature of the low-temperature storage compartment reaches the low set temperature, and to control a defrosting heater and the blowing fan to be driven and the high-temperature storage compartment damper to be opened when the supply of cool air is stopped.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: April 28, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung Ho Cho, Chang Hern Lee
  • Patent number: 9004369
    Abstract: A method and system is provided which receives a desired humidity level from a user for the refrigeration compartment of a refrigerator, determines the current humidity level, and then activates an atomizer in the refrigeration compartment to increase the humidity level if needed. The humidity in the refrigeration compartment may be determined based at least in part on the temperature of the refrigeration compartment, the defrost timer, the door opening times, and the compressor timer.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: April 14, 2015
    Assignee: Whirlpool Corporation
    Inventors: Anderson Bortoletto, Rameet Singh Grewal, Guolian Wu
  • Patent number: 8997507
    Abstract: A refrigerator is provided that includes a low energy defrost system and method for melting frost formed on an evaporator of a cooling system for the refrigerator. The low energy defrost system includes using air from the refrigerator compartment or external air adjacent the refrigerator to be directed to the evaporator and passed adjacent the evaporator coils to melt any frost formed thereon. As the air is above freezing temperature, it will melt any frost formed on the coils without the need of use an electrical heater. Re-cooled air from the melted frost may then be directed back into the refrigerator compartment to be used to aid in cooling the refrigerator compartment or keeping the refrigerator compartment at the programmed or predetermined temperature.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: April 7, 2015
    Assignee: Whirlpool Corporation
    Inventor: Patrick J. Boarman
  • Patent number: 8997508
    Abstract: An object of the present invention is to keep an appropriate high pressure side pressure in a refrigerant circuit while reducing noises of an operation of a blower in a refrigerating apparatus which obtains a critical pressure on a high pressure side. The refrigerating apparatus in which the refrigerant circuit is constituted of a compressor, a gas cooler, a reducing element and an evaporator to obtain a supercritical pressure on the high pressure side includes a blower which air-cools the gas cooler and a control device which controls this blower. This control device controls a revolution speed of the blower based on an outdoor temperature and an evaporation temperature of a refrigerant in the evaporator.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazuhiko Mihara, Hidetaka Sasaki, Setsu Hasegawa, Ken Kawakubo, Masahisa Otake, Takashi Sato, Akira Matsuzaki
  • Patent number: 8997509
    Abstract: A heat pump system is configured to have a defrost cycle operable during a heating mode of operation. The system uses: larger than conventionally sized capillary tubes at the liquid refrigerant entry end of an exterior air-source heat exchanger; a special amount of additional refrigerant charge; a supplemental hot gas refrigerant transport line extending from the compressor; a special valve in the new supplemental hot gas refrigerant transport line; and another special valve controlling a restriction to the refrigerant flow in the common consolidated vapor refrigerant transport line exiting the exterior heat exchanger. A controller opens the valve in the new supplemental hot gas refrigerant transport line and to simultaneously engages, for a special period of time, the valve controlling the specially sized restriction to the refrigerant flow in the common consolidated vapor refrigerant transport line exiting the exterior heat exchanger at periodic intervals during potential frost conditions.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: April 7, 2015
    Inventor: B. Ryland Wiggs
  • Publication number: 20150033774
    Abstract: Systems and methods are disclosed for water collection from atmospheric moisture in large quantities in uncontrolled outdoor environments where the temperature may be cold and humidity levels low. To extract water from air when the dew point is low, a heat exchanger cools to a point where water vapor is deposited on its surface as ice. The heat exchanger then cycles through a heating phase to melt the ice and generate liquid water. The accumulation of frost is advantageous. Frost accumulation enables water collection when the dew point is low. Disclosed variations enhance efficiency and environmental tolerance.
    Type: Application
    Filed: September 29, 2014
    Publication date: February 5, 2015
    Inventors: Wayne FERREIRA, Henri-James TIELEMAN
  • Publication number: 20150027145
    Abstract: A cooling storage evaporator system employs a pivoting frost control door upstream from an evaporator that, when closed, inhibits air from passing through a lower portion of the evaporator. Closing the frost control door results in condensed water freezing on a lower portion of the evaporator when the AC is ON. When a vehicle engine is turned OFF when the vehicle stops in an idle condition, thereby turning the compressor OFF, the frost control door opens so that air passes over the evaporator, including the frozen portion thereof, melting the frozen condensed water to maintain the cool outlet air temperature at the vent.
    Type: Application
    Filed: July 24, 2013
    Publication date: January 29, 2015
    Applicant: Honda Motor Co., Ltd.
    Inventors: Junichi Kanemaru, Shinji Kakizaki
  • Publication number: 20140338381
    Abstract: A refrigerating and air-conditioning apparatus performs, even during a heating operation under air conditions leading to formation of frost, a defrosting operation while simultaneously continuing the heating operation and improves comfort through heating by securing an appropriate amount of ventilation. A plurality of refrigeration cycles independently performs a heating operation and a defrosting operation. By controlling a ventilation damper of an indoor unit that is to perform a defrosting operation to increase the amount of ventilation, a prior ventilation operation for securing the time-averaged required amount of ventilation including the period in which the defrosting operation is being performed is performed before the defrosting operation, and after the prior ventilation is terminated, the defrosting operation is started.
    Type: Application
    Filed: September 13, 2011
    Publication date: November 20, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: So Nomoto, Tomotaka Ishikawa
  • Patent number: 8869545
    Abstract: Heat pumps with improved defrost cycles and methods of defrosting heat exchangers, for example, having microchannel outdoor heat exchangers. A heat exchanger has three types of connection points that are used during a defrost cycle. Two connection points are used to deliver hot refrigerant gas to the heat exchanger and one connection point is where refrigerant exits the heat exchanger. Two of the connection points are at the same header and during at least part of the defrost cycle, at least part of the hot refrigerant gas is passed through that header without passing through any cross tubes of the heat exchanger. A defrost valve in a refrigerant conduit opens during the defrost cycle to deliver hot refrigerant gas to the connection point on the header. In a number of embodiments, the defrost valve is open only during a portion of the defrost cycle.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: October 28, 2014
    Assignee: Nordyne LLC
    Inventors: Jie Chen, Jacob J. Rede, David L. Koesterer, Craig A. Thomas
  • Publication number: 20140311172
    Abstract: An outdoor unit includes a compressor compressing a sucked refrigerant and discharging compress, an outdoor heat exchanger exchanging heat between outdoor air and the refrigerant, an accumulator storing a liquefied refrigerant at a suction side of the compressor, a solenoid valve for storing the refrigerant in the outdoor heat exchanger, and a controller performing control so as to feed the refrigerant stored within the outdoor heat exchanger during a defrosting operation, to the accumulator on the basis of an amount of refrigerant within the accumulator when operation is switched to a heating operation from the defrosting operation.
    Type: Application
    Filed: June 8, 2012
    Publication date: October 23, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Kazuhisa Iwasaki
  • Publication number: 20140305145
    Abstract: A control system and a control method for controlling input voltages (1) for household appliances having at least one electric motor in their set of electric charges or devices (5). This control is made by means of a processing unit (3), which can act selectively and independently on a set of output switches (4) and, therefore, act in different ways on each of the devices (5).
    Type: Application
    Filed: September 4, 2012
    Publication date: October 16, 2014
    Applicant: WHIRLPOOL S.A.
    Inventors: Marcelo Zanelato, Marcos Roberto De Souza, Silvia Helena Pini
  • Publication number: 20140298838
    Abstract: An air conditioning apparatus for a vehicle includes a refrigerant heater 41 that is provided between an internal evaporator 8 and a suction side of an electric compressor 20 to be in parallel with an external evaporator 32, and heats a refrigerant which is suctioned into the electric compressor 20; and an air conditioning control apparatus 50 that determines whether the external evaporator 32 is frosted. While the air conditioning apparatus for a vehicle operates in a heating mode, when the air conditioning control apparatus 50 determines that the external evaporator 32 is frosted, a supply of the refrigerant subject to the heat exchange in an internal condenser 9 to the external evaporator 32 is stopped, and the refrigerant is supplied to the refrigerant heater 41, is heated and then, is suctioned into the electric compressor 20.
    Type: Application
    Filed: December 7, 2012
    Publication date: October 9, 2014
    Applicant: MITSUBIHSI HEAVY INDUSTRIES AUTOMOTIVE THERMAL SYSTEMS, CO., LTD.
    Inventors: Masatoshi Morishita, Toshihisa Kondo, Akira Katayama
  • Patent number: 8844299
    Abstract: Systems and methods are disclosed for water collection from atmospheric moisture in large quantities in uncontrolled outdoor environments where the temperature may be cold and humidity levels low. To extract water from air when the dew point is low, a heat exchanger cools to a point where water vapor is deposited on its surface as ice. The heat exchanger then cycles through a heating phase to melt the ice and generate liquid water. The accumulation of frost is advantageous. Frost accumulation enables water collection when the dew point is low. Disclosed variations enhance efficiency and environmental tolerance.
    Type: Grant
    Filed: March 4, 2012
    Date of Patent: September 30, 2014
    Assignee: Ecoloblue, Inc.
    Inventors: Wayne Ferreira, Henri-James Tieleman
  • Patent number: 8833384
    Abstract: A valve and actuator assembly includes a valve to control a flow of liquid into a coil, and an actuator to control the valve. The assembly includes a first temperature sensor to sense the temperature of liquid flowing through the valve, a second temperature sensor to sense the temperature of air surrounding the coil, and a flow meter to measure a flow rate of liquid through the valve. The actuator includes a module that receives data from the first and second temperature sensors and from the flow meter, and determines, based on data received from the flow meter and temperature sensors, a likelihood that the liquid in the coil will freeze. The actuator operates the valve to allow a minimum flow of the liquid through the valve and coil during a potential freeze condition. The minimum flow is sufficient to prevent the liquid in the coil from freezing.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: September 16, 2014
    Assignee: Schneider Electric Buildings, LLC
    Inventor: Alan Burt
  • Publication number: 20140250930
    Abstract: A first heat exchanger, a desiccant block, and a second heat exchanger are arranged in series. In a dehumidification operation, a first operation mode in which the first heat exchanger acts as a condenser or a radiator and the second heat exchanger acts as an evaporator and a second operation mode in which the first heat exchanger acts as an evaporator and the second heat exchanger acts as a condenser or a radiator are alternately repeated.
    Type: Application
    Filed: October 16, 2012
    Publication date: September 11, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumitake Unezaki, Shinichi Ito
  • Publication number: 20140245766
    Abstract: A first flow switching device causes part of a refrigerant discharged from an injection compressor to flow through a first bypass pipe and be supplied to an outdoor heat exchanger targeting for defrosting. A second flow switching device causes part of the refrigerant supplied to the outdoor heat exchanger targeting for defrosting to enter a second bypass pipe.
    Type: Application
    Filed: January 24, 2012
    Publication date: September 4, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shinichi Wakamoto, Naofumi Takenaka, Koji Yamashita, Osamu Morimoto, Hirofumi Koge
  • Patent number: 8800307
    Abstract: A method for operating a refrigeration system for a container for refrigerating chilled cargo includes providing a refrigeration system including a compressor and an evaporator fan associated with an evaporator. The method also includes determining the temperature of supply air and the temperature of return air. The method further includes determining one of a requirement for heating and a requirement for cooling based on the temperature of the return air and the temperature of the supply air. The method additionally includes activating the evaporator fan when a requirement for heating is determined and increasing the speed of the evaporator fan when increased heating is determined. The method also includes activating the compressor and the evaporator fan when a requirement for cooling is determined and increasing the power supplied to the compressor and maintaining the evaporator fan at a first speed when increased cooling is determined.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: August 12, 2014
    Assignees: Thermo King Corporation, Johnson Controls Technology Company
    Inventors: Ole Thogersen, Allan Dyrmose, Dan Vad Steffensen
  • Patent number: 8800308
    Abstract: Methods and systems are provided for air conditioning, capturing combustion contaminants, desalination, and other processes using liquid desiccants.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: August 12, 2014
    Assignee: 7AC Technologies, Inc.
    Inventors: Peter F. Vandermeulen, Jack I. Hanoka, Chaim Hanoka
  • Publication number: 20140216083
    Abstract: A refrigerant circuit is configured by connecting, by pipes, a compressor that compresses a heat-source-side refrigerant, a first refrigerant flow switching device, a heat-source-side heat exchanger, an expansion device, and one or more intermediate heat exchangers that exchange heat between a heat-source-side refrigerant and a heat medium that is different from the heat-source-side refrigerant. A controller performs control of pumps to drive the pumps at a specific pump capacity or higher to circulate the heat medium at a time when a heat recovery defrosting operation for causing the heat-source-side refrigerant that has been heated by the heat medium in the intermediate heat exchangers to flow into the heat-source-side heat exchanger for defrosting purposes.
    Type: Application
    Filed: December 16, 2011
    Publication date: August 7, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Osamu Morimoto, Daisuke Shimamoto, Koji Azuma, Takayoshi Honda
  • Publication number: 20140165630
    Abstract: The invention relates to a method for controlling a refrigeration system by establishing a defrost period during an initial defrost period. One or more compressors of the refrigeration system are monitored to establish if the one or more compressors are running, and a parameter representative of the one or more compressors running is monitored. The monitoring establishes at least one parameter limit value representative of whether a defrost period or a non-defrost period is to be initiated. The invention also relates to a method for controlling a refrigeration system subsequent to an electrical power interruption. The invention also relates to control units for applying one or both of the methods according to the invention, and to a refrigeration system having one or more control units controlling the refrigeration system according to one or both of the methods.
    Type: Application
    Filed: July 13, 2012
    Publication date: June 19, 2014
    Applicant: DANFOSS A/S
    Inventors: Gero C. Langenberg, Hans Erik Fogh
  • Publication number: 20140165628
    Abstract: An order in which parts of a heat source side heat exchanger are defrosted is determined on the basis of the heat exchanger capacity of the parts of the heat source side heat exchanger, the necessary heating capacity of the parts of the heat source side heat exchanger, and the arrangement of the parts of the heat source side heat exchanger, the opening and closing of first flow switching valves, second flow switching valves, and third flow switching valves are controlled accordingly, and a defrosting operation in which a refrigerant discharged from a compressor is caused to flow through the heat source side heat exchanger is performed.
    Type: Application
    Filed: March 28, 2013
    Publication date: June 19, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Naomichi TAMURA, Tadashi ARIYAMA
  • Patent number: 8752397
    Abstract: In an air-conditioning apparatus, a heat source side heat exchanger 12, intermediate heat exchangers 15a and 15b, and use side heat exchangers 26a to 26d are separately formed and adapted to be disposed at separate locations, respectively. There are provided a defrosting operation function to melt frost attached around the heat source side heat exchanger 12, and a heating function during defrosting operation that drives a pump 21a to circulate a heat medium and supply heating energy to the use side heat exchangers 26a to 26d in need of heating to perform heating operation. The defrosting operation function can be executed by switching a four-way valve 11 to cooling side to introduce a high-temperature high-pressure refrigerant flowed out of the compressor 10 into the heat source side heat exchanger 12.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: June 17, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Yamashita, Hiroyuki Morimoto, Yuji Motomura, Takeshi Hatomura
  • Publication number: 20140150477
    Abstract: In various implementations, frost in a vapor compression system may be controlled. A property of a fan may be determined. A determination may be made whether a frost event and/or a nonfrost event has occurred based at least partially on the determined fan property.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Inventors: Yi Qu, H. Gene Havard, Jon Douglas, Jeff Mangum
  • Publication number: 20140150479
    Abstract: Frost may accumulate on a heat pump. In various implementations, a primary defrost operation and/or a secondary defrost operation may be utilized to remove at least a portion of the frost from the heat pump.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Inventors: Yi Qu, Bruce Perkins, Chris Mchugh, Mark Olsen
  • Patent number: 8739563
    Abstract: Adaptable evaporator defrost logic is employed in a refrigeration system to detect a build-up of ice on the evaporator. In response to the detected build-up of ice, a defrost operation is initiated that includes decreasing the speed of the compressor. At the end of the defrost operation, the adaptable evaporator defrost logic determines whether the defrost operation was a success. If the defrost operation was a success, then normal operation is resumed. If the defrost operation was not a success, then the defrost operation is modified by turning the compressor off and extending a duration of the defrost operation.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: June 3, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Kodjovi Coussey, Richard Rusich, Tejendra Patel, Anson Stark Coolidge
  • Publication number: 20140137580
    Abstract: A method of refrigeration control through a refrigeration system of a refrigerated transport container includes performing a defrost cycle on the refrigeration system by activating a heat source; and restarting the refrigeration system after the defrost cycle has completed, wherein restarting the refrigeration system includes performing a liquid slugging avoidance process including: initiating a compressor of the refrigeration system at a speed; opening a pressure equalization valve in parallel with the compressor in response to the initiating; opening a liquid valve in series between a condenser and an evaporator after opening of the pressure equalization valve; and closing the pressure equalization valve after a period of time.
    Type: Application
    Filed: July 7, 2011
    Publication date: May 22, 2014
    Applicant: Carrier Corporation
    Inventors: Fabienne Peyaud, JeanPhilippe Goux, Virginie Choquart
  • Patent number: 8707716
    Abstract: A method of defrosting a heat exchanger while the heat exchanger continues to cool air passing through the heat exchanger. The heat exchanger includes liquid passages for carrying cold liquid between an inlet and an outlet and air passages in thermal communication with the liquid passages for cooling air passing through the air passages. The method includes introducing warmer liquid to a first selected section of the heat exchanger liquid passage while continuing to provide cold liquid to the liquid passages of the heat exchanger.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: April 29, 2014
    Assignee: The Boeing Company
    Inventor: Steve G. Mackin
  • Patent number: 8707719
    Abstract: An air conditioner includes a refrigerant circuit, a switching valve, an outdoor fan and a controller. The refrigerant circuit sequentially circulates refrigerant through a compressor, an indoor heat exchanger, a decompression mechanism and an outdoor heat exchanger during a heating operation. The switching valve is connected to the refrigerant circuit to switch a flow direction of the refrigerant discharged from the compressor. The controller executes a defrosting operation control in which the outdoor fan is deactivated and the switching valve directs refrigerant discharged from the compressor towards the outdoor heat exchanger during a defrosting operation. The controller further maintains the switching valve so refrigerant discharged from the compressor is directed towards the outdoor heat exchanger and executes a fan defrosting operation control in which the outdoor fan is rotated for a predetermined period of time after completion of the defrosting operation when a predetermined condition is satisfied.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: April 29, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Tsuyoshi Yamada, Tetsuya Ogasawara, Junichi Shimoda
  • Patent number: 8689573
    Abstract: A refrigerated merchandiser including a case, a refrigeration system, a sensor, and a controller. The refrigeration system is operable in a defrost mode defrosting the evaporator, and a refrigeration mode discharging a refrigerated airflow into the product storage area to refrigerate the product and to maintain the product within a predetermined temperature range without freezing the product, and to receive the refrigerated airflow along a return passageway. The sensor senses one or more defrost conditions of the case. The controller controls the refrigeration system in the refrigeration mode and in the defrost mode, and includes an algorithm for calculating when to initiate the defrost mode and for calculating a duration of the defrost mode. The controller is programmed to vary the refrigeration system between the refrigeration mode and the defrost mode based on the signals indicative of the defrost conditions and the calculations by the algorithm.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: April 8, 2014
    Assignee: Hussmann Corporation
    Inventors: Jony M. Zangari, Dennis L. Wagner, Mark Schaefer, Dennis L. Dickerson, Scott N. Hixson, William R. North
  • Patent number: 8650896
    Abstract: A system, configured to be disposed in a information technology equipment rack for providing ice thermal storage, includes a tank configured to hold water, a heat exchanger disposed in water in the tank and configured to convey a two-phase liquid and vapor refrigerant and to transfer heat between the water and the refrigerant, a first valve connected to a liquid and a vapor refrigerant line and configured to selectively connect the liquid refrigerant line to a first port and the vapor refrigerant line to a second port in a first mode and to connect the liquid refrigerant line to the second port and the vapor refrigerant line to the first port in a second mode, a thermostatic expansion valve connected to an inlet of the heat exchanger, and a liquid/vapor pump connected to an outlet of the heat exchanger and to the second port of the first valve.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: February 18, 2014
    Assignee: Schneider Electric It Corporation
    Inventor: John H. Bean, Jr.
  • Publication number: 20140041846
    Abstract: An HVAC system may include a building controller, two or more HVAC components and at least two Equipment Interface Modules (EIM). Each of the EIMs may include a wired and/or wireless interface for communication to the HVAC controller. Each EIM may be wired to one or more of the HVAC components of the HVAC system. In some cases, the HVAC controller may be configured to provide one or more control commands to control two or more of the HVAC components of the HVAC system via the EIMs. In some cases, the EIMs may provide control signals to the HVAC controller, and the HVAC controller may generate one or more commands in response to the received control signals.
    Type: Application
    Filed: August 9, 2012
    Publication date: February 13, 2014
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Cary Leen, Stan Zywicki,, III, Steve C. Nichols
  • Publication number: 20140033750
    Abstract: An air-conditioning apparatus including a check valve in a passage between a first flow switching device and a suction side of a compressor, an expansion valve midway of a liquid extension piping, and an additional unit having a first bypass and a second bypass that are branched off from a passage between an indoor unit and the liquid expansion valve, and are connected to a passage between the check valve and the suction side of the compressor. The first bypass has, midway thereof, a first bypass expansion valve capable of controlling a throughput of refrigerant and an auxiliary heat exchanger that has a heat source different from the refrigerant, the auxiliary heat exchanger functioning as an evaporator heating the refrigerant flowing in the first bypass. The second bypass has, midway thereof, a second bypass expansion valve capable of controlling a throughput of refrigerant.
    Type: Application
    Filed: August 2, 2012
    Publication date: February 6, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kosuke TANAKA, Tomohiko KASAI
  • Publication number: 20140026600
    Abstract: A climate control system for the interior cabin of an automotive vehicle. The climate control system includes a mode selection device configured for selecting a defrost mode. When the system is in the defrost mode, a controller receives a signal from a humidity sensor indicative of the measured humidity level in the vicinity of the window. The controller compares this measured humidity level with a threshold humidity level and, if the humidity is below the threshold humidity level, the controller stops operation of a compressor being used to dehumidify the air being provided to defrost the window, thereby minimizing possible fogging of the window and increasing the efficiency of the vehicle.
    Type: Application
    Filed: July 25, 2012
    Publication date: January 30, 2014
    Inventor: Erik A. Wippler