Abstract: A heat exchanger liquid refrigerant defrost system disclosed herein specifically designed to defrost the coil subsystems used on an outdoor heat exchanger used on a building heat pump unit or combination heat pump/air condition unit. The outdoor heat exchanger contains at least two coil subsystems each including having a first secondary bypass check valve, a secondary liquid line, a bypass solenoid, a suction solenoid, and a metering device. During use, the flow of warm liquid refrigerant through the coil subsystems is selectively controlled to defrost the coil subsystem one chamber at a time. The other coil subsystems continue to exchange heat and warm the building. When all of the coils systems are sequentially defrosted, all of the coil subsystems may operate in a heating mode or begin the defrost cycle again. Two important benefits of the system over a conventional heat exchanger are the amount of energy required to defrost the coil subsystem is reduced and a supplemental heat source is not needed.

Abstract: 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 assist operation, a heating degree of the heater core is increased higher than a predetermined heating degree. Further, when the operation of the heat pump cycle is switched from the defrosting operation to the heating assist operation, an air outlet mode except for a defrosting mode for defrosting a windshield is set. Further, in the defrosting operation of the heat pump cycle, the temperature of an interior heat exchanger of the heat pump cycle is set higher.

Abstract: An improvement in defrosting an air-to-air heat pump system when in the heating mode. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil, The bypass loop includes a valve movable between closed and open positions. A sensor monitors a preselected condition indicative of outdoor coil performance. A controller communicates with the valve and the sensor. Once the controller determines that a preselected set point of a preselected condition indicative of deteriorating performance has been reached, based on received sensor signals, the controller sends a signal to open the valve, allowing warm refrigerant to bypass expansion valves and flow to the outdoor unit to defrost the outdoor unit. Once defrosting is accomplished, the valve can be moved to a closed position to resume normal operation of the heat pump unit.

Abstract: The invention relates to a heating/cooling circuit for a motor vehicle comprising an evaporator (14) for cooling air to be fed into an interior space, a heat exchanger (16) for heating said air to be fed into the interior space, an external heat exchanger (22) comprising a compressor for transporting coolant, a first expansion organ (28), allocated to the evaporator (14), a second expansion organ (30), allocated to the external heat exchanger (22) and coolant conduits (L1 to L12), via which the aforementioned components are interconnected. The compressor (24), the external heat exchanger (22) and the second expansion organ (30) constitute a de-icing circuit of the inventive circuit.

Abstract: A first, optional second, optional third air conditioning systems employing air condensers and/or water condensers, coupled to a water source are disclosed. The water source includes a water to air heat exchanger, which is not coupled to nor provides cooling to either a habitable interior space or an attic.

Abstract: An air conditioner comprising an outdoor unit and an indoor unit provided with an indoor heat exchanger and an indoor expansion device, wherein the outdoor unit comprises a compressor for compressing a refrigerant, an outdoor heat exchanger for heat-exchanging a refrigerant, a four-way valve adjacently arranged to the compressor for circulating a refrigerant discharged from the compressor according to a heating cycle or a cooling cycle, and a refrigerant detouring path for detouring a refrigerant discharged from the outdoor heat exchanger to the compressor at the time of a defrosting operation, thereby performing the defrosting operation without stopping the heating cycle and thus preventing an indoor heating loss.

Abstract: An air conditioner comprising an outdoor unit and an indoor unit provided with an indoor heat exchanger and an indoor expansion device, wherein the outdoor unit comprises a compressor for compressing a refrigerant, an outdoor heat exchanger for heat-exchanging a refrigerant, a four-way valve adjacently arranged to the compressor for circulating a refrigerant discharged from the compressor according to a heating cycle or a cooling cycle, and a refrigerant detouring path for detouring a refrigerant discharged from the outdoor heat exchanger to the compressor at the time of a defrosting operation, thereby performing the defrosting operation without stopping the heating cycle and thus preventing an indoor heating loss.

Abstract: An air conditioning system for conditioning ambient air of an environment, an interior heat exchanger coil used in such air conditioning system, and a method for conditioning ambient air of the environment. The air conditioning system has first and second reverse cycle refrigeration apparatuses each including a circuit having an interior portion located inside of the environment and being provided with a heat exchanger coil, and an exterior portion located outside of the environment. The heat exchanger coil of the second reverse cycle refrigeration apparatus is distinct from the heat exchanger coil of the first reverse cycle refrigeration apparatus and extends substantially along at least a portion of a given path along which the latter extends. The system also has a group of fins extending between both heat exchanger coils along the portion of the given path for allowing a heat exchange between both heat exchanger coils.

Abstract: The invention relates to a heating/cooling circuit for a motor vehicle comprising an evaporator (14) for cooling air to be fed into an interior space, a heat exchanger (16) for heating said air to be fed into the interior space, an external heat exchanger (22) comprising a compressor for transporting coolant, a first expansion organ (28), allocated to the evaporator (14), a second expansion organ (30), allocated to the external heat exchanger (22) and coolant conduits (L1 to L12), via which the aforementioned components are interconnected. The compressor (24), the external heat exchanger (22) and the second expansion organ (30) constitute a de-icing circuit of the inventive circuit.

Abstract: The invention is based on a method for operating a climate control system for a vehicle, in the case of which a compressor (38), in a cooling mode, circulates a coolant through a gas condensing apparatus (42) and an expansion device (50) to a passenger-compartment heat exchanger (44) and, in a heating mode, circulates the coolant in the reverse direction of flow first through the passenger-compartment heat exchanger (44), the expansion device (50), and then through the gas condensing apparatus (42), in parallel with which a bypass line (56) comprising a switching valve (58) is provided. It is proposed that, in the heating mode, the switching valve (58) in the bypass line (56) is opened and the flow of coolant through the gas condensing apparatus (42) is stopped as soon as a layer of ice that exceeds a limit thickness has formed on the air side of the gas condensing apparatus (42).

Abstract: A method and apparatus for drying the surface of a heat exchanger in a vehicle of moisture accumulating as a result of its use as an evaporator in an air conditioning system. Air is first heated by the heater core in the air conditioning system and then directed through the heat exchanger. Because of the reduced humidity of such air, any residual moisture in the heat exchanger is evaporated and is discharged to the environment. Where the system is used in a vehicle, it prevents the discharge of moist air onto the windows and/or windshield of the vehicle and thus minimizes or eliminates fogging of the windshield.

Abstract: A heat pump system includes an indoor unit and an outdoor unit, with a compressor, an outdoor fan, and a reversing valve all in the outdoor unit. A thermostat is added to the outdoor unit with one side of the thermostat connected to a high voltage line for either a compressor or a magnetic contactor and the other side connected to a high voltage line for either an outdoor fan or a reversing valve. A signal collection circuit in the indoor unit is connected to a high voltage line for the outdoor fan when the other side of the thermostat is connected to the outdoor fan and to a high voltage line for the reversing valve when the other side of the thermostat is connected to the reversing valve. The thermostat sends a signal to the electronic control board when the defrosting operation should be terminated.

Abstract: A compressor (21), a heat exchanger (30), a demoisturizer (22), and an expansion device (23) are duct connected in that order to form a heat source-side system (20). The compressor (21) draws and compresses outdoor air and exhaust air for ventilation. The compressed air is subjected to heat exchange with air for conditioning in the heat exchanger (30). The compressed air is demoisturized in the demoisturizer (22). Thereafter, the compressed air is expanded in the expansion device (23), changes to low-temperature air, and then is expelled to outside the room. On the other hand, the conditioning air is delivered, through an inlet duct (43), to the heat exchanger (30). The conditioning air is a mixture of supply air for ventilation and air in the room. The conditioning air is subjected to heat exchange with the compressed air in the heat exchanger (30), whereby the conditioning air is heated. Further, the conditioning air is humidified in a humidifying part (42).

Abstract: A hot gas defrost system for a refrigeration cycle, including at least a compressor, reversing valve, condenser and evaporator. During defrost, the reversing valve directs the superheated refrigerant from the compressor to the evaporator. The hot gas traverses the evaporator coil which, in turn, causes the ice or frost to melt. The hot gas defrost refrigeration system may also include a receiver to store the refrigerant during the refrigeration and defrost cycles.

Abstract: A portable heating and cooling unit intended to be used within a room or area of a building includes a cabinet supported on a plurality of wheels and a refrigeration circuit at least partially carried within said cabinet. The refrigeration circuit includes a first coil, a compressor, a second coil and a refrigerant reversing valve. In a cooling mode of operation, the first coil acts as an evaporator coil and room air is circulated by a first fan across the evaporator coil and delivered into the room. A second fan circulates room air through the second coil acting as a condenser coil and discharges the thus warmed air away from the room area to be cooled. In a heating mode of operation, the refrigerant reversing valve is activated to change the flow direction of the refrigerant through the circuit such that the first coil now acts as a condenser and The second coil now acts as the evaporator.

Abstract: In a scroll compressor that can switch between an internal high-pressure operation and an internal low-pressure operation, in order to provide proper back pressure for an orbiting scroll during either operation, a back pressure chamber of the orbiting scroll is divided by means of a first and a second thrust rings into a first back pressure chamber in communication with a driving chamber and an independent second back pressure chamber, and the pressure in the second back pressure chamber is set at discharge pressure or suction pressure depending on an operation mode.

Abstract: A hot gas defrost system for a refrigeration cycle, including at least a compressor, reversing valve, condenser and evaporator. During defrost, the reversing valve directs the superheated refrigerant from the compressor to the evaporator. The hot gas traverses the evaporator coil which, in turn, causes the ice or frost to melt. The hot gas defrost refrigeration system may also include a receiver to store the refrigerant during the refrigeration and defrost cycles.

Abstract: Heat exchange equipment comprising a compressor which is connected to an indoor heat exchanger and also to two outdoor heat exchangers, and flow-direction changing means to change the direction of flow in the heat exchangers whereby each of the outdoor heat exchangers can be defrosted whilst the other continues to remove heat from its surroundings. Pressure lowering means are provided between the two outdoor heat exchangers.

Abstract: An air conditioner comprising a refrigerant forward path branching on a discharge side of a compressor in an outdoor unit, one of the branched portions being defined by connecting a first four-way valve, a first outdoor heat exchanger and a first outdoor expansion valve to one another in this order, and the other of the branched portions being defined by connecting a second four-way valve, a second outdoor heat exchanger and a second outdoor expansion valve in this order, the path extending to an indoor unit from the respective outdoor expansion valves through a liquid-side piping, and returning to the outdoor unit from the indoor unit through a gas-side piping to branch, one of the branched portions being connected to the first four-way valve via a check valve placed in communication in a forward direction and the other of the branched portions being connected to the second four-way valve, the air conditioner being controlled such that, when heating operation is switched to defrosting operation, the second f

Abstract: A portable heating and cooling unit intended to be used within a room or area of a building includes a cabinet supported on a plurality of wheels and a refrigeration circuit at least partially carried within said cabinet. The refrigeration circuit includes a first coil, a compressor, a second coil and a refrigerant reversing valve. In a cooling mode of operation, the first coil acts as an evaporator coil and room air is circulated by a first fan across the evaporator coil and delivered into the room. A second fan circulates room air through the second coil acting as a condenser coil and discharges the thus warmed air away from the room area to be cooled. In a heating mode of operation, the refrigerant reversing valve is activated to change the flow direction of the refrigerant through the circuit such that the first coil now acts as a condenser and the second coil now acts as the evaporator.