Compression refrigerating system for a motor vehicle air-conditioning system comprises a carbon dioxide coolant cycle, and a reversing valve that can be switched to a second coolant cycle for heating operation

摘要

Compression refrigerating system for a motor vehicle air-conditioning system comprises a CO2 coolant cycle circulating via coolant lines from a compressor (1) via a gas condenser (2), an expansion element (4) and an evaporator (5) back to the compressor. A reversing valve (9) provided between the compressor and the gas condenser can be switched to a second coolant cycle for heating operation with the compressor, a throttle element (7) and a heat exchanger (8). The coolant volume between the compressor and the throttle element is at least 50 cm3. Preferred Features: The coolant volume between the compressor and the throttle element is at least 100 cm3, preferably 100-200 cm3.