HEAT PUMP SYSTEM FOR EFFECTIVELY INCREASING ROOM TEMPERATURE OF VEHICLE IN CASE OF HEATING AND PREVENTING FROST

摘要

PURPOSE: A heat pump system is provided to effectively increase the room temperature of a vehicle in case of heating and to prevent frost by securing a sufficient heat source. CONSTITUTION: A compressor(100) compresses and discharges a heat exchange medium. A first three-way valve(110) is connected with a discharge line(101) of the compressor for selectively switching a passage direction to more than two directions. An outdoor heat exchanger(120) is connected to a port(111) of the first three-way valve by the medium of a line. A second three-way valve(130) is connected with a discharge line(121) of the outdoor heat exchanger for selectively switching a passage direction to more than two directions. A receiver tank(140) is connected with a first port(131) of the second three-way valve by the medium of a line and is connected with the compressor. An expansive valve(150) and an indoor heat exchanger(160) are sequentially installed at a line between the second three-way valve and the receiver tank. A third three-way valve(200) is installed between the indoor heat exchanger and the receiver tank for selectively switching a passage direction to more than two directions so that the heat exchange medium discharged through the first port of the second three-way valve is flowed into the receiver tank by way of the indoor heat exchanger, or the heat exchange medium discharged through the second port of the second three-way valve is flowed into the receiver tank. An inner heat exchanger(300) exchanges heat between the heat exchange medium discharged from the receiver tank and flowed to the compressor and the heat exchange medium discharged from the outdoor heat exchanger and flowed to the indoor heat exchanger. A cooling water heat exchanger(400) is installed on a line between the second three-way valve and the third three-way valve for individually flowing cooling water for cooling an engine and the heat exchange medium.