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7617694 |
Apparatus and method for controlling super-heating degree in heat pump system
Provided is an air conditioner, particularly, an apparatus and method for controlling a super-heating degree in a heat pump system for preventing a liquid refrigerant from flowing into a...
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7607317 |
Air conditioner with oil recovery function
An air conditioner includes a refrigerant circuit that includes a heat source heat exchanger configured such that refrigerant flows in from below and flows out from above when the heat source heat...
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7559206 |
Supercritical heat pump cycle system
A supercritical heat pump cycle system includes a low-pressure determining unit for determining a pressure of a low-pressure refrigerant after being decompressed in a decompression unit, a target...
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7540163 |
Prevention of flooded starts in heat pumps
A heat pump is provided with a method and control for eliminating flooded starts. In particular, the heat pump at start-up is operated for a short period of time in the opposite mode to that in...
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7530390 |
Air conditioner for a motor vehicle
The invention relates to an air conditioner for a motor vehicle, comprising a coolant circuit ( 1 ) that is provided with several heat-transferring devices through which a coolant can be directed,...
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7520320 |
Automotive air conditioning system
An automotive air conditioning system has a primary hot water circuit 11 located on a side where a vehicle installed heat generator 10 is located and a secondary hot water circuit 13 which...
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7454919 |
Hot-water supply apparatus
Defrosting operation is possible by causing refrigerant discharged from a compressor to flow to an outdoor heat exchanger, and returning the refrigerant passed through the outdoor heat exchanger to...
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7438501 |
Ground freezing installation accommodating thermal contraction of metal feed pipes
A ground freezing system includes a metal feed pipe for delivering refrigerant to the lower end of a freeze pipe installed in a bore in the ground. The feed pipe is supported on a compression...
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7434415 |
System and method for using hot gas reheat for humidity control
A humidity control method is provided for a multi-stage cooling system having two or more refrigerant circuits that balances humidity control and cooling demand. Each refrigerant circuit includes a...
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7380588 |
Heat pump control system and method of operating to provide automatic backup heating modes
A heat pump type heating and air conditioning system includes a gas furnace or other auxiliary heat source and a thermostat and controller associated with the heat pump and the auxiliary heat...
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7380411 |
Heat source unit with switching means between heating and cooling
The present invention provides a heat source unit capable of being used in either an air conditioner for switchable cooling and heating operation or an air conditioner for simultaneous cooling and...
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7377119 |
Air conditioning system and control method thereof
An air conditioning system includes an indoor heat exchanging unit, an outdoor heat exchanging unit, a compressor forming a closed loop together with the indoor and outdoor heat exchanging units to...
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7373783 |
Outdoor unit of air conditioner and controlling method for the same
To provide an air conditioner capable of operating devices in an outdoor unit by connecting an indoor unit, which is capable of transmitting operational commands and operational modes using simple...
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7356998 |
Flash tank of two-stage compression heat pump system for heating and cooling
Disclosed herein is a flash tank of a two-stage compression heat pump system that can perform cooling and heating with a separate type intercooler and a high-stage compressor protecting device. The...
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7350366 |
Heat pump
The present invention provides a heat pump including: a compressor; a radiator; a first throttling device having a variable opening; an expander; a second throttling device having a variable...
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7308800 |
Multi-type air conditioner with defrosting device
Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for...
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7290600 |
Air-to-air heat pump defrost bypass loop
A system for defrosting an air-to-air heat pump system is disclosed. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an...
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7287581 |
Full function vehicle HVAC/PTC thermal system
The integrated automotive HVAC/PTC system of the present invention includes a bi-fluidic heat exchanger between an air conditioning subsystem and a heating subsystem which enables heat extracted...
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7263848 |
Heat pump system
A heat pump is operable in a heating mode and a cooling mode and includes two identical heat exchangers. The heat exchangers alternate between operating as a condenser and an evaporator as the heat...
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7261243 |
Thermostat responsive to inputs from external devices
A thermostat is provided that receives one or more inputs from at least one heating system of a climate control system, and initiates an appropriate action in response to the input. The thermostat...
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7257955 |
Discharge valve to increase heating capacity of heat pumps
A heat pump is provided with a discharge valve on a discharge line. The discharge valve can be positioned to modulate or pulse refrigerant flow from the discharge line heading toward an indoor heat...
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7234311 |
Prevention of compressor unpowered reverse rotation in heat pump units
A heat pump is provided with a method and control for eliminating compressor un-powered reverse rotation at shutdown. In particular, the position of the four-way reversing valve is changed and the...
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RE39625 |
Boosted air source heat pump
A boosted source heat pump (BSHP) is presented having a primary compressor, a booster compressor, an economizer, and a lubricant management system. At least the primary compressor is a twin-single...
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7204094 |
Air conditioner
An air conditioner having a plurality of outdoor units and a plurality of indoor units with a common piping connected via a common piping to transfer refrigerant therebetween, the air conditioner...
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7181917 |
Control method for four-way valve of multiple heat pump
Disclosed herein is a control method for four-way valves of a multiple heat pump. In the control method, if even at least one of four-way valves of respective outdoor units is not switched to a...
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7155921 |
Air conditioning system and air conditioning method
A driving method of an air conditioning system is disclosed. The air conditioning system includes a first cooling device combined with a heating function and having a compressor, an outdoor heat...
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7152416 |
Hot gas bypass through four-way reversing valve
A heat pump four-way valve selectively routes refrigerant to either indoor or outdoor heat exchanger. The position of the plunger inside the valve can also be adjusted to selectively provide a hot...
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7140427 |
Vehicle air conditioner with defrosting operation in exterior heat exchanger
In a vehicle air conditioner for heating a passenger compartment by a heater core and a heat pump cycle, when operation of a heat pump cycle is switched from a defrosting operation to a heating...
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7100384 |
System and method for cooling or heating
The invention relates to a system for cooling and heating, having a first heat exchanger ( 10 ) for outputting heat to and extracting it from a heat reservoir ( 12 ); a second heat exchanger ( 14 )...
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7051542 |
Transcritical vapor compression optimization through maximization of heating capacity
A vapor compression system includes a compressor, a gas cooler, an expansion device, and an evaporator. Refrigerant is circulated through the system. The high side pressure of the vapor compression...
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7043928 |
Refrigeration cycle system
A refrigeration cycle system is disclosed. Upon generation of a start signal for a hot gas heater cycle, the cooling mode is first started thereby to start the dormant refrigerant recovery mode (S...
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6990826 |
Single expansion device for use in a heat pump
A heat pump is provided with a single expansion device a pair of four-way reversing valves. One of the reversing valves routes the refrigerant from the compressor to either an outdoor heat...
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6966197 |
Air conditioner with dehumidifying and heating operation
When a dehumidifying and heating operation is set in an air conditioner, refrigerant is circulated from a compressor to the compressor through a first exterior heat exchanger, a decompression...
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6935125 |
Air conditioning system
When the air blowing amount of a blower 23 is large, a high pressure is controlled so as to be increased higher than when the air blowing amount by the blower 23 is small. By this construction,...
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6918264 |
Multi-type air conditioner
Multi-type air conditioner including an outdoor unit having a compressor, an outdoor heat exchanger, a flow path control valve for controlling a flow path of the refrigerant from the compressor, an...
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6915656 |
Heat pump system
A method and system for heating a space includes circulating refrigerant in a closed loop system having a first heat exchanger and a second heat exchanger. The circulating step includes...
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6907745 |
Heat pump with improved performance in heating mode
A heat pump having an indoor coil that operates as a condenser when the system is in a heating mode and an outdoor coil that operates as an evaporator when the system is in the heating mode. A...
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6880356 |
Simultaneous heating and cooling operation type multi-air conditioner
Disclosed is a multi-air conditioner comprising: an outdoor unit installed at an outdoor location and exchanging heat with an outdoor air, a plurality of indoor units installed at respective indoor...
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6868680 |
Air-conditioning control apparatus using heater
The heater has increased quick responsiveness to temperature control of air, and the air conditioner can realize highly accurate temperature control using the heater. A duct unit having heat...
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6826924 |
Heat pump apparatus
Indoor circuits ( 60, 65 ) of indoor units ( 12, 13 ) are each connected in parallel to an outdoor circuit ( 20 ) of an outdoor unit ( 11 ). The outdoor circuit ( 20 ) has a gas vent pipe ( 35 ) by...
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6826921 |
Air conditioning system with variable condenser reheat for enhanced dehumidification
A vapor compression air conditioning system, including a heat pump embodiment, provides enhanced dehumidification of supply air to an enclosed space. The refrigerant fluid circuit includes an...
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6775996 |
Systems and methods for temperature control
The problem of controlling the temperature of the different units in a process tool system which have to be cooled or heated using thermal transfer fluid at selected setpoints and flow rates is...
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6772600 |
Multi-unit air conditioner and method for controlling the same
Multi-unit air conditioner including an outdoor unit including a flow path control valve for controlling a flow path of refrigerant from a compressor, outdoor heat exchanger having one side in...
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6751976 |
Heat pump equipment
Heat pump equipment comprising at least three heat exchangers, one of which is intended to be located in an enclosed region and the other two of which are intended to be located outside the...
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6725679 |
Vehicle air conditioner with defrosting operation of exterior heat exchanger
In a vehicle air conditioner with a heat pump cycle having an interior heat exchanger and an exterior heat exchanger, when a frosting on a surface of the exterior heat exchanger is determined and...
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6684651 |
Channel selector valve and method of driving the same, compressor with the channel selector valve, and device for controlling refrigerating cycle
Upon a selector operation of a valve such as a four-way selector valve provided in a refrigerating cycle for selecting a channel of fluid, prevention of environmental pollution and energy saving...
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6679074 |
Automatic switching refrigeration system
A method of operating a refrigeration system having a discharge port that guides conditioned air from the system to a conditioned space and a return port that guides air from the conditioned space...
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6616414 |
Apparatus and method for controlling a compressor
In an apparatus and a method for controlling a compressor, by setting a stroke reference value so as to be smaller than a maximum stroke value in a maximum load state and operating the...
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6591621 |
Two stage reciprocating compressors and associated HVAC systems and methods
A two stage reciprocating compressor and associated HVAC systems and methods are disclosed. The reciprocating compressor includes a crankshaft having an eccentric crankpin, a reversible motor for...
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6543531 |
Device and method for heating and cooling a compartment of a motor vehicle
A device and a method are provided for heating and cooling a compartment of a motor vehicle powered by an internal combustion engine. The device has a coolant circuit with a compressor, an ambient...
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