Vehicle air conditioning system, especially carbon dioxide unit, has additional heat exchanger and pressure reducing throttle valve

摘要

A vehicle air conditioning system, especially using carbon dioxide, has a cooling medium circuit comprising a compressor (6), cooler (7), heat exchanger (8), expansion valve (9) and vaporizer (5). To switch from heating to cooling an additional heat exchanger (10) is integrated with an expansion valve (14) to lower the pressure.