In a heat pump cycle device, a flow passage switching portion includes a flow passage switching valve body configured to open and close a cooling side flow passage. A refrigerant circulation circuit includes a low-pressure flow passage through which a low-pressure refrigerant decompressed by a first decompressor flows toward a compressor in a heating mode, and a pre-evaporator flow passage provided between the flow passage switching valve body and a refrigerant inlet of an evaporator. The flow passage switching portion causes a pre-evaporator flow passage to communicate with the low-pressure flow passage while bypassing the evaporator when a refrigerant pressure in the low-pressure flow passage is lower than a refrigerant pressure in the pre-evaporator flow passage, in the heating mode.

The present invention relates to an outdoor heat exchanger, and more particularly, to a down flow type outdoor heat exchanger having channels of at least three paths in a heat pump system for vehicles, in which a flux distribution means protruded in a height direction is further formed in a lower tank in which the channel is changed from an upward direction to a downward direction or from a downward direction to an upward direction to block some area of a lower portion thereof so as to prevent a refrigerant from being non-uniformly distributed while a flux is concentrated toward a rear side of the channel due to a fluid inertia in an area in which the flow path is changed, thereby delaying frosting upon heating.

A refrigeration system is of the type that includes a refrigerant compressor unit which compresses normal refrigerating mass flow and a parallel compressor. The parallel compressor in a parallel compression mode of operation of the refrigerant circuit, sucks in refrigerant from the intermediate pressure accumulator and compresses it to high pressure. It is proposed that, in order to increase efficiency, the power of the parallel compressor is controlled by a control system. The control system determines at least one reference variable representing a load state of the refrigerant circuit, that determines a set intermediate pressure value on the basis of the at least one reference variable at least in a parallel compression mode of operation, and that regulates the intermediate pressure in accordance with the set intermediate pressure value at least in the parallel compression mode of operation.

A modulator for a sub-cool condenser assembly including a condenser. The modulator includes a plurality of extruded tubes positioned to convey liquid refrigerant towards an outlet of the modulator.

An apparatus for cooling a computer system includes a primary cooling loop. The primary cooling loop includes an evaporator configured to cool at least a component of the computer system, an ambient cooled condenser connected to the evaporator, a first pump to provide a coolant flow within the cooling loop, a pressure regulator configured to maintain a selected pressure in the primary cooling loop, and a controller responsive to changes in outdoor ambient conditions and an amount of heat dissipated by the computer system and configured to dynamically adjust the pump and pressure regulator in response thereto.

A heat exchanger for vehicles includes: a plurality of first stacked plates forming a condensing portion in which a refrigerant is condensed through heat exchange between a coolant and the refrigerant; a receiver container for storing the refrigerant passing through the condensing portion; a plurality of second stacked plates forming a sub-cooling portion for cooling the refrigerant through heat exchange between the coolant and the refrigerant discharged from the receiver container; and an intermediate plate between the first stacked plates and the second stacked plates and comprising through holes through which the refrigerant and the coolant respectively move.

A refrigeration cycle device is configured to be selectively switchable between an air-cooling first refrigerant circuit that causes refrigerant to flow out of a liquid-phase refrigerant outlet of a gas-liquid separator, and an air-heating second refrigerant circuit that causes the refrigerant to flow out of a gas-phase refrigerant outlet of the gas-liquid separator. In the refrigeration cycle device, an oil separator is disposed in a refrigerant passage that leads from a heat dissipation device to a first expansion valve. Thus, when the first refrigerant circuit is configured in the refrigeration cycle device, the refrigerant passing through the oil separator is in a single gas phase or in an almost gas phase, so that oil can be easily separated from the refrigerant. Furthermore, when the refrigerant circulates through the first refrigerant circuit, oil can be retained at a position other than the gas-liquid separator.

A refrigeration unit and methods of operating a refrigeration unit for an HVACR system are disclosed. The refrigeration unit includes a refrigerant circuit, including a compressor, a condenser, an expansion device, and an evaporator fluidly connected. The condenser includes a condenser portion and a subcooler portion. A single receiver tank is fluidly connected to an output of the condenser portion and an input of the subcooler portion. A restrictor is fluidly connected to the receiver tank. The restrictor can induce a pressure drop in a working fluid flowing from the subcooler portion.

A condenser for a heating, ventilation, air conditioning and refrigeration system includes a condenser shell, a refrigerant inlet located at the condenser shell, and a condenser drain located at the condenser shell. A condenser tube bundle is located in the condenser shell such that a refrigerant flow entering the condenser via the refrigerant inlet passes over the condenser tube bundle before exiting the condenser at the condenser drain. Two or more condenser ballast volumes are located in the condenser shell between the tube bundle and the condenser drain. The two or more condenser ballast volumes are spaced apart to define a channel therebetween. A condenser ballast volume of the two or more condenser ballast volumes has a horizontal top surface.

A liquid receiver is composed of a tubular base member having open upper and lower ends, a tubular tank member having a closed upper end and an open lower end and joined to the base member, and a plug fitted into the base member. A female screw is provided on the inner circumferential surface of the base member, and refrigerant inflow and outflow holes are formed in a portion of the base member above the female screw such that the former is located above the latter. A male screw to be screwed into the female screw is provided on the outer circumferential surface of the plug to be located below the refrigerant outflow hole. Sealing is established between a portion of the inner circumferential surface of the base member located below the female screw and a portion of the outer circumferential surface of the plug located below the male screw.