HOT GAS HEATER SYSTEM FOR EFFICIENTLY HEATING PASSENGER ROOM OF VEHICLE BY ADJUSTING POSITION OF HOT GAS EXPANSION VALVE

摘要

PURPOSE: A hot gas heater system for a vehicle is provided to improve heating performance of the heater system by supplying high temperature and high pressure refrigerant from the compressor to the evaporator without passing the expansion valve. CONSTITUTION: A heater system of a vehicle is composed of a refrigerant circulation passage passing a compressor(8), a condenser(5), a first expansion valve(10) and an evaporator(1), and a first refrigerant branch passage diverging from the refrigerant circulation passage between the compressor and the condenser and returning to the refrigerant circulation passage between the evaporator and the first expansion valve. A second refrigerant branch passage diverges from the lower part of the evaporator, returns to the upper part of the compressor and comprises a second expansion valve(2). A three-way valve(6) is mounted at the place in which the first refrigerant branch passage diverges from the refrigerant circulation passage.