Heating or air conditioning system for motor vehicle has cooling and refrigeration circuits, heat exchanger for transferring heat, heating arrangement for separate heating of coolant

摘要

The system has a cooling circuit consisting of a compressor (14), a condenser (16), an expansion element (18) and an evaporator (20), an engine coolant circuit (24) and a liquid/liquid heat exchanger (22) for transferring heat from the coolant in the refrigeration circuit to the refrigerant in the refrigeration circuit. For transferring heat the heat exchanger operates as an evaporator in the refrigeration circuit and the refrigeration circuit acts as a heat pump. A heating arrangement is provided for separate heating of the coolant.