Heat Source Is A Reverse Cycle Refrigerating System Or Heat Pump Patents (Class 237/2B)
  • Patent number: 6164367
    Abstract: An automotive air conditioning apparatus 10 is provided which includes a forced water supply system 9 and a heat pump system 14. A controller 16 controls the temperature of a second heat exchanger 38 of the heat pump system 14 to a desired temperature based on a preset temperature. The controller 16 also controls the temperature of the water circulating through the heat exchanger 20 of the forced water supply system 9 to a temperature at which the quantity of heat exchange between the air heated by the second heat exchanger 38 to the desired temperature and the heat exchanger 20 of the forced water supply system is minimized. According to this air conditioning arrangement, the temperature of the vehicle interior can be promptly raised without any capability drop being caused and thus, the heating efficiency of the apparatus being well enhanced.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: December 26, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasufumi Kurahashi, Minoru Fukumoto, Norio Yoshida
  • Patent number: 6149066
    Abstract: A method and apparatus for controlling supplemental heat added to the air stream passing from an indoor coil to an air supply duct of a heat pump system, the heat pump system being of the type that includes an indoor thermostat having a first set point for initiating heat supplied by the indoor coil and a second set point for initiating additional heat supplied by supplemental heating means. The supplemental heating elements include an adjustable output heating element for heating air passing from the indoor coil to the air supply duct. The coil discharge temperature of the air stream heated by the indoor coil is determined at a position between the indoor coil and the supplemental heating means. The adjustable output heating element is selectively energized in response to the coil discharge temperature, independent of the second set point of the indoor thermostat.
    Type: Grant
    Filed: August 17, 1999
    Date of Patent: November 21, 2000
    Assignee: Carrier Corporation
    Inventors: Timothy J. Perry, Hongmei Liang, Larry J. Burkhart, Nathan D. Wright, Raymond A. Rust, Jr., Louis J. Sullivan
  • Patent number: 6138919
    Abstract: A multi-section evaporator is employed in a heat pump system which includes a compressor, a condenser and an evaporator. A control valve is connected between each adjacent set of evaporator sections and the control valve is operable in response to temperature and/or pressure conditions sensed by a sensor. In response to a sensed condition, one or more sections of the evaporator are brought into operation concurrently with the previously operating section(s). Thus, the effective size of the evaporator is variable depending on the sensed condition.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: October 31, 2000
    Assignee: Pool Fact, Inc.
    Inventors: Kenneth W. Cooper, Martin A. Rawhouser
  • Patent number: 6109533
    Abstract: An air conditioning system includes one outdoor unit and at least one indoor unit connected to each other. The outdoor unit has a variable capacity compressor, a four-way valve, an outdoor heat exchanger, and a refrigerant heater, while the indoor unit has an indoor heat exchanger. A saturation temperature calculator computes the saturation temperature at the refrigerant heater outlet pressure. A refrigerant heater outlet temperature detection circuit detects the refrigerant temperature near the refrigerant heater outlet. A superheating calculator calculates refrigerant superheating at the refrigerant heater outlet based on values supplied thereto from the refrigerant heater outlet temperature detection circuit and saturation temperature calculator. A compressor frequency control circuit then adjusts the compressor frequency so that the calculated refrigerant superheating is maintained at a specific level.
    Type: Grant
    Filed: September 24, 1998
    Date of Patent: August 29, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takahiko Ao, Yoshikazu Nishihara, Kuniyasu Uchiyama, Kazuhito Nakatani, Norimasa Ishikawa
  • Patent number: 6105666
    Abstract: Described is an apparatus for air conditioning a passenger compartment of an automotive vehicle which achieves a quick warming-up of the passenger compartment. In the air conditioning apparatus, in addition to a coolant of a vehicular engine which is utilized as a heat source of a heater core, a highly compressed refrigerant discharged from a compressor can be utilized as a heat source of a sub condenser which is disposed in an air passage of the air conditioning apparatus, during the inside air warming up in the passenger compartment. During the warming up operation, the refrigerant discharged from the compressor is circulated through a bypass line bypassing a condenser disposed at a front part of an engine compartment and through the sub condenser and an evaporator.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: August 22, 2000
    Assignee: Calsonic Corporation
    Inventors: Tadayoshi Tajima, Toshio Ohashi, Kaoru Kamiyama
  • Patent number: 6102114
    Abstract: A multi-room air conditioning system includes an outdoor unit and a plurality of indoor units connected in parallel to the outdoor unit. A compressor frequency and combustion control calculator reads a load level for each indoor unit from a load coefficient table using a differential temperature calculated by a differential temperature calculator and a rated capacity stored in a rated capacity memory. The compressor frequency and combustion control calculator then multiplies a sum of the load levels by a predetermined constant and adds a compensation value thereto to obtain a frequency value. This value is used to control the compressor. The compressor frequency and combustion control calculator also sets a target combustion level using the frequency value for control of a refrigerant heater mounted in the outdoor unit.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: August 15, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshikazu Nishihara, Kuniyasu Uchiyama, Masanori Ogawa, Youji Takanashi, Takahiko Ao, Norimasa Ishikawa
  • Patent number: 6079218
    Abstract: An air conditioner for a vehicle includes a heat pump system for heating and cooling. The air conditioner includes a ventilation passage for ventilating air from a passenger compartment of the vehicle outside of the vehicle. An accelerating system is provided with the heat pump system for accelerating the evaporation of a refrigerant during air cooling or the condensation of a refrigerant during air heating by using involved energy recovered from air exhausted outside of said vehicle through the ventilation passage. Thereby, the air conditioner increases the heating and cooling ability and reduces the energy necessary for maintaining a constant temperature in the passenger compartment.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: June 27, 2000
    Assignee: Sanden Corporation
    Inventor: Katsumi Ueda
  • Patent number: 6073690
    Abstract: A heating system control unit is provided for use with a heating system. The control unit includes a switching element connected to a first temperature switch associated with a first stage heater, a second temperature switch and a second stage heater of the heating system. The switching element is adapted for actuating the second stage heater upon the receipt of the second temperature signal and further continuing the actuation of the second stage heater until the lack of receipt of both the first temperature signal and the second temperature signal. A thermostat on the outdoor coil serves to pass the signal from the second temperature switch only upon a temperature of the outdoor coil being below a predetermined amount of about 25 degrees Fahrenheit.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: June 13, 2000
    Inventor: Donald R. Raley
  • Patent number: 6042016
    Abstract: An air conditioner for vehicles includes a combustion heater and a heat pump. The air conditioner comprises a heat medium heater-heating operation starting system, and a heating-condition switching system. The heat medium is subjected to heat exchange with air to be air-conditioned and is shared by the heat pump and the combustion heater. The heater-heating operation starting system starts the operation of the heat pump and the combustion heater when a heater switch is turned ON and an outside air temperature is less than or equal to a first predetermined temperature. The heating-condition switching system stops the operations of the heat pump and continues the operation of the combustion heater when the temperature of the heat medium is greater than or equal to a second predetermined temperature after the start of a heater-heating operation due to the heat pump and said combustion heater.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: March 28, 2000
    Assignee: Sanden Corporation
    Inventor: Susumu Ikeda
  • Patent number: 5984198
    Abstract: Heat pump apparatus for heating liquid, such as water, includes a refrigerant circuit and a water circuit, a refrigerant-to-water heat exchanger and an air-to-refrigerant heat exchanger operably disposed in heat exchange relationship with a air fluid stream of a systemically separate primary source of space conditioning. A compressor is provided for circulating the refrigerant between the two heat exchangers and a water pump is provided for circulating the water to be heated through the refrigerant-to-water heat exchanger. A tank is also provided for storing the heated water. The tank has an electrically resistive heating element operably associated therewith. A control circuit is provided for normally enabling operation of the heat pump and disabling the heating element in response to a demand for liquid heating.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: November 16, 1999
    Assignee: Lennox Manufacturing Inc.
    Inventors: Gregory S. Bennett, Thomas J. Carr, Merlin K. Chapin, Nabil G. Hamad
  • Patent number: 5971289
    Abstract: An automotive air conditioning apparatus includes a forced water supply system 12 and a heat pump system 14. The temperature of the vehicle interior is controlled by the heat pump system under ordinary atmospheric temperature conditions. However, at very low temperatures, for example, at the temperature of -5.degree. C. or lower, the temperature of the vehicle interior is controlled by the forced water supply system. According to this air conditioning arrangement, it is possible to achieve energy-efficient air conditioning even under very low temperature conditions and to prevent any compressor damage due to the liquefaction of the refrigerant.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: October 26, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasufumi Kurahashi, Minoru Fukumoto
  • Patent number: 5967411
    Abstract: A method and apparatus for controlling supplemental heat added to the air stream passing from an indoor coil to an air supply duct of a heat pump system, the heat pump system being of the type that includes an indoor thermostat having a first set point for initiating heat supplied by the indoor coil and a second set point for initiating additional heat supplied by supplemental heating means. The supplemental heating elements include an adjustable output heating element for heating air passing from the indoor coil to the air supply duct. The coil discharge temperature of the air stream heated by the indoor coil is determined at a position between the indoor coil and the supplemental heating means. The adjustable output heating element is selectively energized in response to the coil discharge temperature, independent of the second set point of the indoor thermostat.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: October 19, 1999
    Assignee: Carrier Corporation
    Inventors: Timothy J. Perry, Hongmei Liang, Larry J. Burkhart, Nathan D. Wright, Raymond A. Rust, Jr., Louis J. Sullivan
  • Patent number: 5966954
    Abstract: An air conditioning system comprises a heat source side unit adapted to condense and supply a fluid which can change a phase between a gas phase and a liquid phase and a plurality of user side units entirely or mostly disposed below the heat source side unit in terms of number and connected to said heat source side unit by piping so as to establish a circulation of the fluid supplied from said heat source side unit passing through said heat source side unit and said user side units by utilizing the difference in specific gravity between the liquid phase and the gas phase of said liquid so that it can provide a cooling/heating effect regardless of the floors where the user side units are installed and the power consumption rate of the system can be minimized.
    Type: Grant
    Filed: December 3, 1997
    Date of Patent: October 19, 1999
    Assignee: Sanyo Electronic Co., Ltd.
    Inventors: Hidetoshi Arima, Nobuhiro Idei, Masashi Izumi, Akira Hatakeyama, Hiroyuki Takada
  • Patent number: 5946927
    Abstract: A water heater and storage tank assembly comprises a housing defining a chamber, an inlet for admitting cold water to the chamber, and an outlet for permitting flow of hot water from the chamber. A compressor is mounted on the housing and is removed from the chamber. A condenser comprises a tube adapted to receive refrigerant from the compressor, and winding around the chamber to impart heat to water in the chamber. An evaporator is mounted on the housing and removed from the chamber, the evaporator being adapted to receive refrigerant from the condenser and to discharge refrigerant to conduits in communication with the compressor. An electric resistance element extends into the chamber, and a thermostat is disposed in the chamber and is operative to sense water temperature and to actuate the resistance element upon the water temperature dropping to a selected level.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: September 7, 1999
    Assignee: Arthur D. Little, Inc.
    Inventors: John T. Dieckmann, Brian J. Nowicki, W. Peter Teagan, Robert Zogg
  • Patent number: 5947373
    Abstract: A heat exchange unit having a first heat exchanger 23 serving as an air heat source, a second heat exchanger 26 which is supplied with fluid such as hot water or the like to heat refrigerant, and a fluid amount adjusting mechanism 30,33 for adjusting the amount of the fluid to be supplied to the second heat exchanger, an air conditioner having the heat exchanger unit, and an air conditioning system having the air conditioner. The second heat exchanger 26 is disposed in a surplus space which is formed by the first heat exchanger 23 and an air blower 41 for promoting heat exchange between the air and the refrigerant flowing in the first heat exchanger 23. The upper portion of the case of the second heat exchanger 26 is provided with a fluid outlet port 100 and a refrigerant outlet port 101 while the lower portion of the case of the second heat exchanger 26 is provided with a fluid inlet port 103 and a refrigerant inlet port 104.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: September 7, 1999
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Junichi Saito, Ryuji Miya
  • Patent number: 5941089
    Abstract: An absorption refrigerating/heating apparatus which performs in any of three modes; refrigerating, thermodynamic heating, and direct flame heating and improves the thermal efficiency during the operation of a direct flame heating mode to decrease the running cost. In the direct flame heating mode, the refrigerant and/or the absorbent is passed to the regenerator to decrease the concentration of the absorbent in the solution in the regenerator. Consequently, the temperature of the solution required for maintaining the vapor pressure in the regenerator at a desired rate can be lowered thus saving the heat needed for heating the solution.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: August 24, 1999
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Toshimitsu Takaishi, Kazuma Ichikawa, Hidetaka Kayanuma
  • Patent number: 5906109
    Abstract: A water heater and storage tank assembly comprises a housing defining a chamber, an inlet for admitting cold water to the chamber, and an outlet for permitting flow of hot water from the chamber. A compressor is mounted on the housing and is removed from the chamber. A condenser comprises a tube adapted to receive refrigerant from the compressor, and winding around the chamber to impart heat to water in the chamber. An evaporator is mounted on the housing and removed from the chamber, the evaporator being adapted to receive refrigerant from the condenser and to discharge refrigerant to conduits in communication with the compressor. An electric resistance element extends into the chamber, and a thermostat is disposed in the chamber and is operative to sense water temperature and to actuate the resistance element upon the water temperature dropping to a selected level.
    Type: Grant
    Filed: July 3, 1998
    Date of Patent: May 25, 1999
    Assignee: Arthur D. Little, Inc.
    Inventors: John T. Dieckmann, Brian J. Nowicki, W. Peter Teagan, Robert Zogg
  • Patent number: 5906104
    Abstract: A heat transfer system including mechanical and electrical components for use with a mechanical air conditioning system to enable the system to efficiently reject heat to a water source, such as a pool or spa while simultaneously cooling an interior space. The air conditioning system incorporates three primary heat transfer coils in a mechanical refrigeration cycle to provide comfort cooling to an interior space while rejecting heat to either the atmosphere or a water source, such as a swimming pool. In an alternate heat pump embodiment, the system is capable of operating in an additional mode to absorb heat from the atmosphere and reject heat to the interior space.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: May 25, 1999
    Inventors: Jay H. Schwartz, Abraham Schwartz
  • Patent number: 5878810
    Abstract: An air-conditioning apparatus forms a refrigerating cycle with a refrigerant heater and a compressor having two cylinders. The apparatus simultaneously carries out a refrigerant heating operation and a heat pump operation when a required heating capacity is high, and when the required heating capacity is low, only the heat pump operation. This operation technique helps reduce the size of the apparatus and expand a variable width of heating capacity. The apparatus also has a defrosting unit for defrosting an outdoor heat exchanger during the heat pump operation.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: March 9, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuo Saito, Katuyoshi Kumazawa, Tetsuo Sano, Toshihiko Saito, Yasuhiro Arai, Shinichi Kameyama
  • 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: 5788149
    Abstract: The system allows selective supply of heat energy to consumers at different temperature levels. A carrier medium heated in at least one heat source such as an environmental collector and a heat pump. An outlet line of the heat source communicates with the inlet of at least one distributor. The distributor has several outlets communicating with flow lines leading to the consumers. The distributor selects the flow line through which the heated carrier medium is to be transported, i.e. which one of the consumers is to be supplied with heat energy.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: August 4, 1998
    Assignee: Eri Energie-Ressourcen Institut Forschungs- und Entwicklungs-GmbH
    Inventor: Alois Schwarz
  • Patent number: 5772113
    Abstract: An engine-driven heat pump system is disclosed in which the waste heat from the engine is used to only heat the water contained in a water heater. Space heating may be then provided by circulating the water through an air-handling unit. In order to simplify the operation, the engine's coolant is circulated through a tube surrounding the heater's storage tank. Any risk of contamination to the potable water supply is removed by venting the region surrounding the coolant-to-water heat exchanger. This is achieved by assuring that a surrounding insulation layer does not form a seal over the heat exchanger and by using a non-setting thermally conductive paste between the tube and tank.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: June 30, 1998
    Assignee: Advanced Mechanical Technology, Inc.
    Inventors: Joseph Gerstmann, Paul F. Swenson
  • Patent number: 5769316
    Abstract: An air conditioner for a vehicle has a heat pump type refrigerant circuit capable of operating at least in a heating mode. The air conditioner comprises a motor fan for supplying air heated by a heat exchanger to the interior of the vehicle during operation of the heating mode, a sensor for detecting the temperature of the air at a position downstream of the heat exchanger and a control unit for controlling the volume of the air supplied by the motor fan to a predetermined minimum volume by controlling the drive of the motor fan when the detected air temperature is lower than a predetermined temperature. Even in a condition where a sufficiently large heat radiation from the heat exchanger cannot be expected, a large volume of cold air that has been insufficiently heated can be prevented from being discharged into the interior of the vehicle.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: June 23, 1998
    Assignees: Honda Giken Kogyo Kabushiki Kaisha, Sanden Corporation
    Inventors: Susumu Ikeda, Toshimi Isobe, Atsuo Inoue, Toshihiko Fujita, Akihiro Tajiri, Mitsuru Ishikawa, Choji Sakuma, Nobuyuki Yuri
  • Patent number: 5758820
    Abstract: A heat recovery system (including associated methods, apparatus and controls for implementing such a system) integrated in a hot water heating system that is combinable with an air conditioning loop containing hot gas wherein the hot water system selectively utilizes heat recovered from the hot gas to produce and store hot water at a preselected temperature level requiring the use of only a single water storage tank. According to one aspect of the invention, hot gas is taken from the air conditioning loop and placed directly into a heat exchanger coil immersed in the water storage tank for selective use therein to produce hot water.
    Type: Grant
    Filed: January 17, 1997
    Date of Patent: June 2, 1998
    Assignee: Amtrol Inc.
    Inventors: George M. Celorier, Jr., Joseph Gerstmann, Andrew D. Vasilakis
  • Patent number: 5752654
    Abstract: A heating system having a primary heat source such as a heat pump, and a supplemental heat source, such as a resistive heater, that is used to complement the heat generated by the primary heat source. Heat is generated by the entire supplemental heat source when the difference between a target temperature and the actual temperature for a space being heated exceeds an extreme predetermined threshold value. Heat is generated by a limited portion of the supplemental heat source when the difference is less than the extreme predetermined threshold value but is greater than another, less extreme, predetermined threshold value. The limited portion of the supplemental heat source is energized and de-energized as needed to generate the amount of heat necessary to achieve a duct temperature setpoint when combined with the heat from the primary heat source.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: May 19, 1998
    Assignee: The Comfort Guardian, Inc.
    Inventors: James J. Mowery, Sr., David W. Stevens
  • Patent number: 5740681
    Abstract: An air conditioning circuit of a motor vehicle is used for heating the cabin of the vehicle. The air conditioning circuit accordingly operates in a cooling mode and a heating mode, selectively. In the heating mode, the refrigerant fluid flowing in the air conditioning circuit flows in a branch of the circuit which bypasses the condenser. The evaporator therefore receives this fluid in the gaseous state and acts as a heat exchanger for dissipating the heat produced in the compressor. The heat dissipated by the evaporator can be used for heating the cabin when that produced by the engine of the vehicle is insufficient for this purpose. To this end, an ejector draws a complementary mass of fluid into the heating loop for the purpose of adjusting the heat energy produced.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: April 21, 1998
    Assignee: Valeo Climatisation
    Inventor: Stefan Karl
  • Patent number: 5727396
    Abstract: A method and apparatus for providing cooling for the prime mover for a gas powered heat pump system, which is operably configured to provide cooling for the prime mover without additional equipment or losses in heating capacity or efficiency. The method and apparatus of the present invention advantageously utilizes the residential or structural hot water system for removal of heat from the prime mover and delivery of that heat to the indoor heat exchanger and/or domestic hot water tank for the heat pump system.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: March 17, 1998
    Assignee: Gas Research Institute
    Inventors: Douglas E. Boyd, Jan B. Yates
  • Patent number: 5704219
    Abstract: In an air conditioning apparatus employing a heat pump system in which a cooling evaporator and a heating condenser are disposed inside the compartment. A compressor is provided with a gas injection port, a fixed throttle for reducing pressure of refrigerant on high pressure side in a refrigerating cycle to middle pressure, and a gas-liquid separator for separating the middle pressure refrigerant of which pressure is reduced by the fixed throttle. The gaseous refrigerant separated by the gas-liquid separator is introduced into the gas injection port. In a heating operation, the refrigerant circulates through the compressor, the condenser, the fixed throttle, the gas-liquid separator, an expansion valve, an outdoor heat exchanger, and the compressor as a closed circuit, while the gaseous refrigerant separated by the gas-liquid separator is injected into the compressor through the gas injection port. As a result, when the outside air temperature is low, the heating capacity is improved.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: January 6, 1998
    Assignees: Nippondenso Co., Ltd., Nippon Soken, Inc.
    Inventors: Takahisa Suzuki, Mitsuo Inagaki, Sadahisa Onimaru, Yukikatu Ozaki, Toshihiro Nagata
  • Patent number: 5692390
    Abstract: A temperature control device for an electric motor vehicle passenger compartment, wherein a fluid coolant flows through an inner heat exchanger arranged in the path of an air flow to the passenger compartment, a first outer heat exchanger arranged in the path of an air flow out of the passenger compartment, and a second outer heat exchanger ?(42)! for exchanging heat with a heat source outside the passenger compartment. Said device may operate in heating mode or in cooling mode depending on the direction of flow of the fluid coolant. The device is useful in motor vehicles.
    Type: Grant
    Filed: April 25, 1996
    Date of Patent: December 2, 1997
    Assignee: Valeo Climatisation
    Inventors: Stefan Karl, Vincent Pomme
  • Patent number: 5678420
    Abstract: A waste incineration heat conversion system has an incinerator for burning waste discharged from an installation, a heat recovering section for recovering the heat generated by combustion of the waste in the incinerator, a cold generating section for generating cold by utilizing the thus recovered heat, and a pipe line for conveying the thus generated cold to the installation so that the thus conveyed cold is utilized in the installation for a purpose.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: October 21, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Toshiko Fukushima, Yasuo Koseki, Akinobu Hayashi, Ryuichi Kaji
  • Patent number: 5678761
    Abstract: An air conditioner for vehicles includes a combustion heater and a heat pump. The air conditioner comprises a heat medium heater-heating operation starting system, and a heating-condition switching system. The heat medium is subjected to heat exchange with air to be air-conditioned and is shared by the heat pump and the combustion heater. The heater-heating operation starting system starts the operation of the heat pump and the combustion heater when a heater switch is turned ON and an outside air temperature is less than or equal to a first predetermined temperature. The heating-condition switching system stops the operations of the heat pump and continues the operation of the combustion heater when the temperature of the heat medium is greater than or equal to a second predetermined temperature after the start of a heater-heating operation due to the heat pump and said combustion heater.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 21, 1997
    Assignee: Sanden Corporation
    Inventor: Susumu Ikeda
  • Patent number: 5669228
    Abstract: An object of this invention is to provide a system for utilizing exhaust heat of a stationary induction apparatus in which highly-useful hot water, for example, of about 70.degree. C. can be provided without increasing an operating temperature of the stationary induction apparatus (e.g. a transformer) to such an extent as to adversely affect the lifetime of the stationary induction apparatus. The system of the present invention includes a heat pump 17 which uses, as a high-temperature heat source, a first stationary induction apparatus cooling system which includes a first water-cooled stationary induction apparatus 1, and a first cooling water circulation system 7, and exhaust heat utilization means 8. This heat pump also uses, as a low-temperature heat source, a second stationary induction apparatus cooling system which includes a second stationary induction apparatus 10, and a second cooling water circulation system 16.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: September 23, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Iga, Kaoru Endou, Takashi Shirone, Yoshito Uwano
  • Patent number: 5647533
    Abstract: A method is described of selectively varying the speed of the indoor blower of a heat pump for heating a building or other indoor area when ambient temperature drops below a predetermined level, in order to reduce the cold blow effect of air entering the building. The operating run time fraction of a heating cycle is determined, and the speed of the indoor blower is adjusted when the run time fraction crosses a predetermined threshold value, except that the speed of the indoor blower is maintained when the run time fraction is sufficiently changed compared with a previous run time fraction.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: July 15, 1997
    Assignee: Carrier Corporation
    Inventors: Don A. Schuster, Larry J. Burkhart, Hongmei Liang, Frederick J. Keller, Jr.
  • Patent number: 5632442
    Abstract: An engine-driven heat pump apparatus having a refrigerant circulation line which includes a pressure-measuring device for measuring the pressure in the refrigerant circulation line downstream of a compressor and upstream of an expansion valve, and an exhaust heat controller for controlling the exhaust heat from the engine based on the pressure by, for example, changing the heat efficiency of the engine, e.g., by controlling at least one of (a) the ignition timing of the engine, (b) the opening and closing timing of an intake port valve and an exhaust port valve, and (c) the opening of a fuel gas-controlling valve, so as to efficiently increase heating power during heating operation at low temperatures, without increasing engine noise or shortening the life of the engine.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: May 27, 1997
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Makoto Misawa, Makoto Oguri
  • Patent number: 5573182
    Abstract: A water heater using the heat pump principle includes a hermetic compressor mounted within a well defined within a water tank. The outlet fitting of the compressor is connected to a condensing tube within the tank that heats the water. The compressor includes a radially outwardly projecting flange that is supported on a support surface on the upper header of the water tank through a resilient pad. The pad includes ribs, dimples, or other projections to partially support the flange away from the surface of the pad and/or to support the pad off of the support surface on the header, to thereby vent the volume defined between the compressor and the well.
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: November 12, 1996
    Assignee: Tecumseh Products Company
    Inventors: Edwin L. Gannaway, Frank J. Scire
  • Patent number: 5558273
    Abstract: A heat pump system for heating and cooling including a vapor compressor driven by a heat engine in which the refrigerant is isolated from a space being conditioned, by a two-pipe loop that, in a heating mode transfers both refrigeration derived heat and heat rejected by the heat engine in an efficient serial manner. The system circuitry includes a counterflow heat transfer fluid to air heat exchanger and a heat transfer fluid to potable water heater exchanger.
    Type: Grant
    Filed: November 10, 1994
    Date of Patent: September 24, 1996
    Assignee: Advanced Mechanical Technology, Inc.
    Inventors: Paul F. Swenson, Edwin E. Jordan, Joseph Gerstmann
  • Patent number: 5538072
    Abstract: A method of controlling a current defrost cycle for an outdoor coil of a heat pump system, the heat pump system having a plurality of supplemental heating elements for heating an air stream passing from an indoor coil to an air supply duct during defrost operation, wherein an initial quantity of supplemental heating elements energized is a function of a most recent previous defrost cycle.
    Type: Grant
    Filed: November 8, 1994
    Date of Patent: July 23, 1996
    Assignee: Carrier Corporation
    Inventors: Larry J. Burkhart, Larry D. Burns
  • Patent number: 5533568
    Abstract: A method of controlling a current defrost cycle for an outdoor coil of a heat pump system, the heat pump system having a plurality of supplemental heating elements for heating an air stream passing from an indoor coil to an air supply duct during defrost operation, wherein an initial quantity of supplemental heating elements energized is a function of a most recent previous defrost cycle. The initial quantity of supplemental heating elements is energized upon initiation of a defrost cycle. Whether the initial quantity of supplemental heating elements provided is insufficient or excessive is determined. At least one of the supplemental heating elements is deactivated if the initial quantity of supplemental heating elements being provided is excessive.
    Type: Grant
    Filed: July 11, 1995
    Date of Patent: July 9, 1996
    Assignee: Carrier Corporation
    Inventors: Don A. Schuster, Hongmei Liang, Larry J. Burkhart, Gary D. Wedlake
  • Patent number: 5522234
    Abstract: An air conditioner includes a compressor, an indoor heat exchanger, an expansion tube, and an outdoor heat exchanger interconnected by refrigerant conduits for operation in cooling and heating modes. In a cooling mode, the outdoor heat exchanger conducts ambient air horizontally across heat exchange coils. In a heating mode, the outdoor heat exchanger conducts heated air from an auxiliary gas-fired heater upwardly across those same coils. The outdoor heat exchanger includes movable blades for creating the horizontal and vertical air flow passages for the cooling and heating modes.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: June 4, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Si H. Yoo, Nack H. Jung, Jong H. Choi
  • Patent number: 5509274
    Abstract: A high efficiency heat transfer system includes a power circuit (350) and heat pump circuit (352). Each circuit having a working fluid flowing therein. In the power circuit, a heater (354) vaporizes the working fluid which is periodically delivered and exhausted through a valve assembly (358) to a power unit (362). The power unit is also a compressor for the working fluid in the heat pump circuit. Fluid exhausted from the driven section of the power unit is passed to a four-way valve (406) which selectively delivers the working fluid to an interior coil (416) or an exterior coil (408) to heat or cool an area. In extremely cold ambient temperatures, the area is heated directly from the power circuit using a by-pass exchanger (428).
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: April 23, 1996
    Assignee: Applied Power Technologies Incorporated
    Inventor: David Lackstrom
  • Patent number: 5461876
    Abstract: An improved combined ambient-air and earth exchange heat pump system includes a subterranean heat exchanger and an ambient-air heat exchanger, both refrigerant-based, which are adapted to be selectively operated individually, serially or in parallel for heating and cooling purposes. The system also includes a compressor, a dynamic load heat exchanger, a reversing valve for converting the system from heating to cooling and vice versa, storage for excess refrigerant including an accumulator, an optional preheat exchanger, a regulating assembly with bleed port arrangement, a bypass mechanism for repetitive start-up attempts, and a lost charge device.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: October 31, 1995
    Inventor: William E. Dressler
  • Patent number: 5435485
    Abstract: A heat engine driven heat pump system including a coolant fluid circulation subsystem further includes an automatic purge system to provide purging of air gases and vapors during initial filling and subsequent on-line operation to eliminate trapped and accumulated gases and vapors which decrease heat pump system efficiency and reliability, and interfere with waste heat recovery.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: July 25, 1995
    Assignee: Gas Research Institute
    Inventor: William G. Atterbury
  • Patent number: 5433266
    Abstract: The present invention relates to an air-conditioning apparatus provided in an vehicle. The apparatus is adapted to deliver conditioned air into a passenger compartment so as to regulate an interior temperature of a passenger compartment at a desired temperature. The apparatus comprises a temperature regulating device for regulating an outlet air temperature, a blower, and a controller for setting a target outlet air temperature and volume.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: July 18, 1995
    Assignees: Mazda Motor Corporation, Naldec Corporation
    Inventors: Shigetoshi Doi, Eiji Ukita, Hiroshi Asou, Yasuhiro Enno, Takashi Tsuchida, Toshikazu Ishikawa
  • Patent number: 5429179
    Abstract: In a combustion engine driven refrigerant vapor compression heat pump system, an integrated heat exchanger is provided which recovers and uses waste heat from the combustion engine coolant and exhaust stream, further produces auxiliary heat when the heat pump system is operating in the heating mode of operation, and uses some of the same components to cool the combustion engine coolant when the heat pump system is operating in the cooling mode of operation. Additional features are integrated into the heat exchanger to provide engine oil cooling and heating.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: July 4, 1995
    Assignee: Gas Research Institute
    Inventor: Thomas A. Klausing
  • Patent number: 5417368
    Abstract: The temperature of the air leaving a heating coil is monitored for rising above a first threshold temperature value. An offset value is calculated for use in the positioning of each damper associated with a zone that is to be heated by air leaving the heating coil when the temperature of the air leaving the heating coil rises above the first threshold value. The offset value for each damper position is maintained until the temperature of the air leaving the heating coil drops below a second threshold temperature lower than the first threshold temperature. Any additional heating sources which also heat the air flowing over the heating coil are turned off immediately if the temperature of the air leaving the cooling coil rises above a third threshold value that is higher than the first threshold value.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: May 23, 1995
    Assignee: Carrier Corporation
    Inventors: Harold L. Jeffery, Harrison T. Hickenlooper, III
  • Patent number: 5405079
    Abstract: In a heating system with a plurality of heat sources, wherein at least a first heat source is normally activated at a first, higher ambient temperature and at least one additional heat source is normally activated at a second, lower ambient temperature, a method for maintaining a desired comfort level in a comfort zone when the first heat source is deactivated comprising the steps of: recognizing that the first heat source is deactivated; and initiating at least one of the additional heat sources when the first, higher ambient temperature is reached.
    Type: Grant
    Filed: July 8, 1993
    Date of Patent: April 11, 1995
    Assignee: Carrier Corporation
    Inventors: Timothy A. Neeley, Kevin D. Thompson
  • Patent number: 5388423
    Abstract: Method of and apparatus for heating or cooling a motor vehicle passenger compartment which communicates with a supply air duct for supplying a stream of air to the compartment and a used air duct for exhausting air from the compartment. A heat source in the form of a sorption reactor transfers heat energy to the air stream, with the reactor being provided with a sorbent such as zeolite or the like. The air stream passes through the reaction chamber of the reactor for extracting moisture from the air stream and adding adsorption heat to the air stream. The air stream then passes through an inflow duct before passing through the reactor, and passes from the reactor through an outflow duct at the outlet end of the reactor. A fresh air duct is provided for selectively feeding fresh air into the inflow duct, and an exhaust air duct opening into the atmosphere is provided for selectively communicating the outflow duct with the exhaust air duct.
    Type: Grant
    Filed: March 16, 1992
    Date of Patent: February 14, 1995
    Assignee: Behr GmbH & Co.
    Inventor: Noureddine Khelifa
  • Patent number: 5370307
    Abstract: An air conditioner has a heating capacity which is increased with a compressor driven by an engine when an outdoor temperature is too low. A work load of the compressor is increased by injecting refrigerant into the compressor via an injecting port. As a result, a load of the engine is also increased so that a coolant temperature is also increased. A large heat radiation from the hot coolant to the indoor air is established at a coolant heat exchanger.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: December 6, 1994
    Assignee: Gas Research Institute
    Inventor: Yuzuru Uehra
  • Patent number: 5366153
    Abstract: A heat pump system in which a vapor compression refrigerant is isolated from the space being conditioned, heat pumped by the refrigeration circuit is stored and a heat transfer fluid circuit is controlled for conditioning the space and for conducting heat from a heat storage medium at times when the refrigeration circuit does not operate in a regular heat pumping mode.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: November 22, 1994
    Assignee: Consolidated Natural Gas Service Company, Inc.
    Inventor: Paul F. Swenson
  • Patent number: 5367602
    Abstract: A water heating system, including both a conventional water heater and an external heat source such as a heat pump, is controlled in accordance with the present invention. The water heater includes a water storage tank, an electrically resistive heating element located in the tank, and a tank-mounted thermostat which closes in response to a demand for water heating to allow electric current flow to the heating element and which opens when the demand for water heating has been satisfied, to interrupt the electric current flow to the heating element. The external heat pump includes a water pump for circulating the water between the storage tank and the heat pump, whereby water is heated by the heat pump and returned to the tank. A current sensor is provided for sensing the flow of electric current to the heating element and a temperature sensor is located external to the water storage tank for sensing the temperature of the water entering the heat pump before the water is heated thereby.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: November 22, 1994
    Assignee: Lennox Industries Inc.
    Inventor: Jeffrey L. Stewart