Auxiliary air heating device for use in air-conditioning/heating installation of car, has evaporation unit to evaporate refrigerant fluid by exchanging heat with heat-transfer fluid circulating in by-pass branch of circuit

摘要

The device (D) has a reheating unit i.e. auxiliary condenser (CDA), for reheating a heat-transfer fluid circulating in a branch (B12) e.g. pipe, of a circuit (C1) by exchanging heat with refrigerant fluid e.g. fluorinated refrigerant or carbon dioxide, from a branch (B21) of another circuit (C2). An evaporation unit is constituted of an expansion unit (MD) e.g. expansion valve, and an auxiliary evaporator (EVA), and evaporates the refrigerant fluid from the reheating unit by exchanging heat with heat-transfer fluid circulating in another branch (B14) i.e. by-pass branch, of the former circuit.