A device for heat distribution in a hybrid motor vehicle includes an engine cooling circuit and a refrigerant circuit for a combined operation in a refrigeration heat pump mode and a reheating mode. The refrigerant circuit includes an evaporator, a compressor, a heat exchanger to supply heat from the refrigerant to air being conditioned for a passenger compartment, and a heat exchanger to transfer heat between a refrigerant of the refrigerant circuit and coolant of the engine cooling circuit. The heat exchanger operates as an evaporator for the heat transfer from the coolant to the evaporating refrigerant, and alternatively operates as a condenser for the heat transfer from the condensing refrigerant to the coolant.

A heating, ventilation, and air conditioning (HVAC) system includes an evaporator coil and a compressor fluidly coupled to the evaporator coil via a suction line. A condenser coil is fluidly coupled to the compressor via a discharge line and fluidly coupled to a metering device via a liquid line. A charge compensator is fluidly coupled to the liquid line via a connection line. A charge compensator re-heat valve is disposed in the connection line.

An apparatus includes a compressor, a first heat exchanger, a reheater, a first valve, a second heat exchanger, a four-way valve, a cap tube, and a blower. The compressor compresses a refrigerant. The blower moves air proximate the second heat exchanger to the reheater. During a cooling mode of operation, the four-way valve is configured to direct refrigerant from the first heat exchanger to the compressor; the compressor compresses the refrigerant received from the first heat exchanger; and the cap tube is configured to allow refrigerant to bypass the reheater.

A refrigeration system includes a heat exchanger configured to provide superheat control for the low temperature low pressure gas refrigerant flowing out of the evaporator and through the first side of the heat exchanger by transferring heat from the high pressure high temperature superheated gas refrigerant flowing through a second side of the heat exchanger. A modulating solenoid valve is located at the inlet of the second side of the heat exchanger and configured to modulate the flow of high pressure high temperature superheated gas refrigerant flowing through the second side of the heat exchanger. A temperature sensor is located in such a way as to measure the temperature of the gas refrigerant flowing out of the evaporator and through the first side of the heat exchanger. A controller is configured to calculate the superheat of the gas refrigerant based on the measured temperature and measured pressure of the gas refrigerant and may compare the calculated superheat to a superheat threshold. If the calculated superheat is less than the superheat threshold, the controller will modulate the flow the high pressure high temperature gas refrigerant flowing through the second side of the heat exchanger. The refrigeration system may be activated in a variety of methods by appropriate control of the valves and other system components.

A vehicle air conditioning apparatus can ensure that the temperature of the air supplied to the vehicle interior is a preset temperature by securing the quantity of heat release for the radiator during a cooling and dehumidifying operation. The valve opening of the condensing pressure regulating part of the first control valve is smaller when the calculated opening SW of the air mix damper is equal to or more than the predetermined value than when the opening SW is smaller than the predetermined value. Accordingly, when the quantity of heat release is not sufficient in the radiator, it is possible to increase the condensing pressure of the refrigerant in the radiator to raise the temperature of the refrigerant in the radiator. Consequently, it is possible to secure the amount of heating, and therefore to ensure that the temperature of the air supplies to the vehicle interior is a preset temperature.

A refrigeration system includes a compressor for compressing a gaseous refrigerant, such that the temperature and pressure thereof increases; a four-way valve controlling whether the refrigeration system is in a heating mode or a cooling mode; a condenser, in which the gaseous refrigerant from the compressor exchanges heat with a high temperature heat carrier, said heat exchange resulting in the refrigerant condensing; an expansion valve reducing the pressure of liquid refrigerant from the condenser, hence reducing the boiling point of the refrigerant; an evaporator, in which the low boiling point refrigerant exchanges heat with a low temperature heat carrier, such that the refrigerant vaporizes; and a suction gas heat exchanger exchanging heat between high temperature liquid refrigerant from the condenser and low temperature gaseous refrigerant from the evaporator. A balance valve is arranged for controlling the amount of heat exchange between the high temperature liquid refrigerant and the low temperature gaseous refrigerant in the suction gas heat exchanger by directing a flow of high temperature liquid refrigerant directly from the condenser to the expansion valve. Disclosed is also a method for controlling such a system.

In a refrigeration cycle apparatus, a refrigerant pipe is connected to a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, a heat absorber, and the compressor sequentially in this order. R290 is used as refrigerant flowing through the refrigerant pipe. The heat absorber is provided in a portion of the refrigerant pipe between the compressor and the first heat exchanger or the second heat exchanger serving as an evaporator. The heat absorber is disposed in contact with an electric component. A branch pipe is connected in parallel with the portion provided with the heat absorber in the refrigerant pipe. The branch pipe is provided with a flow rate regulating valve.

An apparatus includes a compressor, a first heat exchanger, a reheater, a first valve, a second heat exchanger, a four-way valve, a cap tube, and a blower. The compressor compresses a refrigerant. The blower moves air proximate the second heat exchanger to the reheater. During a cooling mode of operation, the four-way valve is configured to direct refrigerant from the first heat exchanger to the compressor; the compressor compresses the refrigerant received from the first heat exchanger; and the cap tube is configured to allow refrigerant to bypass the reheater.

A device and method for heat distribution in a hybrid motor vehicle are provided. The device includes an engine cooling circuit; and a refrigerant circuit for a combined operation in a refrigeration heat pump mode and a reheating mode, includes an evaporator, a compressor, a heat exchanger to supply heat from the refrigerant to air being conditioned for a passenger compartment; and a heat exchanger to transfer heat between a refrigerant of the refrigerant circuit and coolant of the engine cooling circuit, wherein the heat exchanger operates as an evaporator for the heat transfer, and as a condenser for the heat transfer from the condensing refrigerant to the coolant.

A refrigeration apparatus includes a refrigerant circuit connecting heat-source units in parallel with usage units. First and second heat-source units have first and second compressors, first and second heat-source-side heat exchangers, first and second high-pressure receivers, first and second detecting elements detecting whether the receivers are near flooding, first and second bypass channels returning refrigerant in top parts of the receivers to intake sides of the compressors, and first and second motor-operated valves on the bypass channels, respectively. A controller performs excess refrigerant distribution control in which an opening degree of the first valve is controlled to be greater than an opening degree of the second valve when the second detecting element detects a nearly flooded state, and the opening degree of the second valve is controlled to be greater than the opening degree of the first valve when the first detecting element detects a nearly flooded state.