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In a refrigerant cycle system, a low-pressure side gas-liquid separator is disposed between a refrigerant outlet side of an evaporator and a refrigerant suction side of a compressor so that gas refrigerant is sucked into the compressor, and a throttle passage through which liquid refrigerant is intr

In a refrigerant cycle system, a low-pressure side gas-liquid separator is disposed between a refrigerant outlet side of an evaporator and a refrigerant suction side of a compressor so that gas refrigerant is sucked into the compressor, and a throttle passage through which liquid refrigerant is introduced into the compressor is disposed in the low-pressure side gas-liquid separator. Further, in a condenser for condensing gas refrigerant discharged from the compressor in a cooling mode, both first and second heat-exchanging units are provided in this order in a refrigerant flow direction, and a high-pressure side gas-liquid separator is disposed between the first and second heat-exchanging units.

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In a refrigerant cycle system, a low-pressure side gas-liquid separator is disposed between a refrigerant outlet side of an evaporator and a refrigerant suction side of a compressor so that gas refrigerant is sucked into the compressor, and a throttle passage through which liquid refrigerant is intr

In a refrigerant cycle system, a low-pressure side gas-liquid separator is disposed between a refrigerant outlet side of an evaporator and a refrigerant suction side of a compressor so that gas refrigerant is sucked into the compressor, and a throttle passage through which liquid refrigerant is introduced into the compressor is disposed in the low-pressure side gas-liquid separator. Further, in a condenser for condensing gas refrigerant discharged from the compressor in a cooling mode, both first and second heat-exchanging units are provided in this order in a refrigerant flow direction, and a high-pressure side gas-liquid separator is disposed between the first and second heat-exchanging units. eceive coolant and an outlet fixture accessible exteriorly of said module adapted to discharge coolant; and a transcritical refrigerant in said heat pump system. 2. The heat pump system of claim 1 wherein said heat exchanger component includes two separate heat exchangers within said module, both of said separate heat exchangers having a respective part of said first flow path, one of said separate heat exchangers having said second flow path and the other of said separate heat exchangers having said third flow path. 3. The heat pump system of claim 1 wherein said heat exchanger component comprises a single heat exchanger within said module and having said first, second and third flow paths. 4. The heat pump system of claim 1 wherein said valving device comprises a single 4-way valve. 5. The heat pump system of claim 1 wherein said module includes a closed housing having an interior space containing said base, said accumulator, said valving device, said expansion device and said heat exchanger component, said fittings are located on the exterior of said closed housing and said accumulator inlet and outlet, said valve outlet and said expansion device second port are located within said closed housing interior space. 6. The heat pump system of claim 5 wherein said closed housing is insulated. 7. A heat pump system for use in a vehicle having a propulsion system that generates waste heat that is rejected to a coolant and comprising: a compressor; first and second heat exchangers, said first heat exchanger being adapted to be disposed in a passenger compartment or the like to alternatively reject or accept heat from the environment within a passenger compartment or the like, said second heat exchanger being adapted to be disposed in a vehicle and located to be in an air stream that exists when the vehicle is in motion; a module hydraulically interposed between said compressor and said first and second heat exchangers, said module including a base adapted to be mounted to a vehicle, a refrigerant accumulator having an inlet and an outlet and mounted on said base, a valving device mounted on said base and including an inlet fitting accessible from the exterior of the module connected to a high pressure side of said compressor, a valve outlet connected to said accumulator inlet at a location within said module, a first inlet/outlet fitting accessible from the exterior of the module and connected to said first heat exchanger, a second inlet/outlet fitting accessible from the exterior of the module and connected to said second heat exchanger, and at least one valve member movable between positions to alternatively connect said inlet fitting to a selected one of said first and second inlet/outlet fittings and to alternatively connect said valve outlet to the other of said first and second inlet/outlet fittings, an expansion device mounted on said base and having a first port providing with a fitting accessible from the exterior of the module and connected to said first heat exchanger, a heat exchanger component mounted on said base and having first and second heat exchange fluid flow paths, said first flow path being in heat exchange relation with said second flow path, said first flow path being connected to said accumulator outlet at a location within said module and having an outlet fitting accessible from the exterior of the module and connected to a low pressure side of said compressor, said second flow path being connected to a second port on said expansion device at a location within said module and having an inlet/outlet fitting accessible exteriorly of said module connected to said second heat exchanger; and a transcritical refrigerant in said heat pump system. 8. The heat pump system of claim 7 wherein said valving device comprises a single 4-way valve. 9. The heat pump system of claim 7 wherein said module includes a closed housing having an interior space containing said base, said accumulator, said valving device , said expansion device and said heat exchanger component, said fittings are located on the exterior of said closed housing and said accumulator inlet and outlet, said valve outlet and said expansion device second port are located within said closed housing interior space. 10. The heat pump system of claim 9 wherein said closed housing is insulated. 11. For use in a heat pump system for a vehicle having a propulsion system that generates waste heat that is rejected to a coolant and which includes a compressor, and first and second heat exchangers, the first heat exchanger being adapted to be disposed in a passenger compartment or the like to alternatively reject or accept heat from the environment within a passenger compartment or the like, the second heat exchanger being adapted to be disposed in a vehicle and located to be in an air stream that exists when the vehicle is in motion, a module adapted to be hydraulically interposed between the compressor and the first and second heat exchangers, said module including a base adapted to be mounted to a vehicle, a refrigerant accumulator having an inlet and an outlet and mounted on said base, a valving device mounted on said base and including an inlet fitting accessible from the exterior of the module and adapted to be connected to a high pressure side of said compressor, a valve connected to said accumulator inlet at a location within said module, a first inlet/outlet fitting accessible from the exterior of the module and adapted to be connected to the first heat exchanger, a second inlet/outlet fitting accessible from the exterior of the module and adapted to be connected to the second heat exchanger, and at least one valve member movable between positions to alternatively connect said inlet fitting to a selected one of said first and second inlet/outlet fittings and to alternatively connect said valve outlet to the other of said first and second inlet/outlet fittings, an expansion device mounted on said base and having a first port providing with a fitting accessible from the exterior of the module and adapted to be connected to the first heat exchanger, a heat exchanger component mounted on said base and having first, second and third heat exchange fluid flow paths, at least said first flow path being in heat exchange relation with both said second and third flow paths, said first flow path being connected to said accumulator outlet at a location within said module and having an outlet fitting accessible from the exterior of the module adapted to be connected to a low pressure side of said compressor, said second flow path being connected to a second port on said expansion device at a location within said module and having an inlet/outlet fitting accessible exteriorly of said module adapted to be connected to the second heat exchanger, and said third flow path having an inlet fixture accessible exteriorly of said module and adapted to receive coolant and an outlet fixture accessible exteriorly of said module adapted to discharge coolant. 12. For use in a heat pump system for use in a vehicle having a propulsion system that generates waste heat that is rejected to a coolant and which includes a compressor, first and second heat exchangers, the first heat exchanger being adapted to be disposed in a passenger compartment or the like to alternatively reject or accept heat from the environment within a passenger compartment or the like, the second heat exchanger being adapted to be disposed in a vehicle and located to be in an air stream that exists when the vehicle is in motion, a module hydraulically interposed between said compressor and said first and second heat exchangers, said module including a base adapted to be mounted to a vehicle, a refrigerant accumulator having an inlet and an outlet and mounted on said base, a valving device mounted on said base and including an inlet fitting accessible from the exterior of the module and adapted to be connected to a high pr