Patents
Sitemap › F25 - Refrigeration or cooling; Combined heating and refrigeration systems; Heat pump systems; Manufacture or storage of ice; Liquefaction or solidification of gases › F25B - Refrigeration machines, plants, or systems; Combined heating and refrigeration systems; Heat pump systems › F25B 13 - Compression machines, plant, or systems, with reversible cycle
Patents for F25B 13 - Compression machines, plant, or systems, with reversible cycle (6,597)
02/1982
02/02/1982US4313313 Apparatus and method for defrosting a heat exchanger of a refrigeration circuit
01/1982
01/26/1982US4312188 Heat pump system
01/19/1982US4311497 Method and apparatus for heat pump system protection
01/19/1982US4311190 Self contained heating and cooling system with emergency heating
01/05/1982US4308723 Heat pump employing optimal refrigerant compressor for low pressure ratio applications
01/05/1982CA1115801A1 Diagnostic system for heat pump
12/1981
12/29/1981US4308042 Heat pump with freeze-up prevention
12/29/1981US4307775 Current monitoring control for electrically powered devices
12/29/1981US4307578 Heat exchanger efficiently operable alternatively as evaporator or condenser
12/24/1981WO1981003684A1 Plant for the transformation and transport of thermal energy,particularly for driving heat pumps
12/22/1981US4306422 Heat pump system
12/22/1981US4306420 Series compressor refrigeration circuit with liquid quench and compressor by-pass
12/10/1981EP0030553A4 Heat pump including compressor having low pressure ratio application.
12/08/1981CA1113731A2 Heat pump system
12/01/1981US4302942 Solar boosted heat pump
11/1981
11/24/1981US4301660 Heat pump system compressor fault detector
11/10/1981US4299098 Refrigeration circuit for heat pump water heater and control therefor
11/03/1981US4297855 Air valve heat pump
11/03/1981CA1111645A1 Split system air conditioner adapted to receive a water preheater
10/1981
10/27/1981CA1111266A1 Device at heating or cooling unit
10/20/1981US4295344 Refrigeration unit with water
10/13/1981USRE30765 Heat pump system
09/1981
09/29/1981CA1109672A1 Stepped capacity constant volume building air conditioning system
09/22/1981USRE30745 Reverse cycle heat pump circuit
09/15/1981CA1108879A1 Solar-earth thermal system
09/01/1981US4286435 Hot gas defrost system
08/1981
08/19/1981EP0033781A2 Compressor fault detection and control system for a heat pump
08/05/1981EP0032935A1 Underground tank used as a water supply tank for heat pumps
08/04/1981CA1106198A1 Heat pump system
07/1981
07/21/1981US4279129 Hot gas defrost system
07/21/1981CA1105263A1 Method and apparatus for controlling comfort conditions including setback
07/07/1981CA1104358A1 Loss of refrigerant and/or high discharge temperature protection for heat pumps
06/1981
06/24/1981EP0030553A1 Heat pump including compressor having low pressure ratio application
06/10/1981EP0029935A2 Expansion device with adjustable refrigerant throttling and reversible refrigeration system using such an expansion device
06/09/1981US4271899 Heat pump control system
05/1981
05/26/1981US4269261 Microcomputer control for supplemental heating in a heat pump
05/19/1981US4268291 Series compressor refrigeration circuit with liquid quench and compressor by-pass
05/12/1981US4266599 Method and apparatus for controlling comfort conditions including setback
05/12/1981US4266405 Heat pump refrigerant circuit
05/05/1981US4265298 Microcomputer control for supplemental heating with night set-back
04/1981
04/29/1981EP0027604A2 Refrigeration system having two refrigeration circuits
04/28/1981US4263962 Heat pump control system
04/28/1981US4263787 Expansion device with adjustable refrigerant throttling
04/28/1981CA1099934A1 Heat pump system
04/21/1981US4262493 Heat pump
04/21/1981US4262492 Airconditioner
04/07/1981US4259848 Refrigeration system
04/07/1981US4259847 Stepped capacity constant volume building air conditioning system
03/1981
03/24/1981US4257239 Earth coil heating and cooling system
03/17/1981US4256475 Heat transfer and storage system
03/17/1981US4255940 Discharge line filter-dryer
03/10/1981US4254822 Building heating system, particularly utilizing solar and waste heat recovery
02/1981
02/19/1981WO1981000444A1 Underground tank used as a water supply tank for heat pumps
02/10/1981US4249389 Crankcase oil return for a transport refrigeration system providing both heating and cooling
02/03/1981US4248059 Reversible-cycle closed-circuit refrigeration systems
02/03/1981US4248058 Differential piston type reversing valve construction, system utilizing the same and method of making
02/03/1981CA1094836A1 Heat pumps
01/1981
01/27/1981US4246956 Control scheme for a solar assisted heat pump
01/20/1981US4245476 Solar augmented heat pump system with automatic staging reciprocating compressor
01/13/1981CA1093330A1 Auxiliary coil arrangement
01/13/1981CA1093329A1 Multiple compressor heat pump with coordinated design
01/06/1981US4242873 Heat pump type heating and cooling source system
12/1980
12/30/1980CA1092382A1 Control scheme for a solar assisted heat pump
12/30/1980CA1092381A1 Split heat pump outdoor fan arrangement
12/24/1980WO1980002870A1 Heat pump including compressor having low pressure ratio applications
12/23/1980US4240269 Heat pump system
12/23/1980US4240263 Refrigeration system - method and apparatus
12/10/1980EP0019736A2 Heat pump system
12/02/1980US4236381 Suction-liquid heat exchanger having accumulator and receiver
12/02/1980US4236379 Heat pump compressor crankcase low differential temperature detection and control system
11/1980
11/18/1980US4233818 Heat exchange interface apparatus
11/11/1980USRE30433 Heat exchanger
11/11/1980US4232530 Heat pump system compressor start fault detector
11/11/1980US4232529 Energy conservation refrigeration unit
10/1980
10/14/1980US4227901 Filter-drier for heat pump systems
10/14/1980US4227382 Split system air conditioner adapted to receive a water preheater
09/1980
09/30/1980US4224805 Subterranean heat exchanger for refrigeration air conditioning equipment
09/30/1980CA1086518A1 Reversible-cycle closed-circuit refrigeration systems
09/09/1980CA1085179A1 Reversible heat pump system
09/02/1980US4220010 Loss of refrigerant and/or high discharge temperature protection for heat pumps
08/1980
08/05/1980US4215555 Hot gas defrost system
08/05/1980US4215554 Frost control system
07/1980
07/08/1980US4211092 Space heating installation
07/08/1980US4211089 Heat pump wrong operational mode detector and control system
05/1980
05/20/1980USRE30275 Heat exchanger
05/06/1980CA1076826A1 Heat pump with a two-speed compressor
04/1980
04/29/1980CA1076375A1 System for producing refrigeration and a heated liquid and control therefor
04/29/1980CA1076355A1 Air conditioning apparatus including a heat pump
04/15/1980US4197719 Tri-level multi-cylinder reciprocating compressor heat pump system
04/15/1980US4197716 Refrigeration system with auxiliary heat exchanger for supplying heat during defrost cycle and for subcooling the refrigerant during a refrigeration cycle
04/08/1980US4196595 Integrated thermal solar heat pump system
04/01/1980USRE30242 Heat pump system
03/1980
03/25/1980CA1074139A1 Integrated controls assembly
03/20/1980WO1980000491A1 Device for a heating or cooling unit
03/11/1980US4192751 Bi-directional filter drier
03/11/1980CA1073229A1 Control system for heat pump and furnace combination
03/04/1980US4191023 Fuel fired supplementary heater for heat pump
02/1980
02/12/1980US4187691 Heat pump bypass valve arrangement
02/05/1980CA1070968A1 Solar augmented heat pump system with automatic staging reciprocating compressor
01/1980
01/29/1980US4185465 Multi-step regenerated organic fluid helical screw expander hermetic induction generator system
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