To provide initial or supplementary room heating without using a reformed expander.
In an air conditioning system 10 for an occupant car room of an automobile, it has a principal tube 22 connected so as to make a fluid flow from a compressor 12 to an external heat exchanger 14, expander 16, internal heat exchanger 18, accumulator 20, and the compressor, bypass pipe 28 connecting between the compressor and the external heat exchange or between the expander and the internal heat exchanger, and a valve 30 set up in this bypass pipe 28. For cooling, when a refrigerant fluid flows in the principal tube to a first direction X passing through the external heat exchanger, expander, internal heat exchanger, and the accumulator from the compressor to return to the compressor, the valve is placed in a closed position, for heating, when the refrigerant fluid flows in the first direction also passes through the bypass pipe and the valve, it is placed in an opened position. Without using a reformed expander, supplementary heating can be presented.
ENGEL THOMAS O
BUGEJA PIERRE
DULIN JEAN-JACQUES
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