| 摘要 |
PURPOSE: A frost-free air conditioner is provided to increase heating efficiency since frost does not appear. CONSTITUTION: A frost-free air conditioner comprises a compressor(100), a first electrical four-way valve(110), a heat exchanger(200), a temperature raising device(300), an expansion valve(400) and an evaporator(600). The first electrical four-way valve selectively supplies refrigerant, which flows out of the compressor, to the heat exchanger or the evaporator. The heat exchanger heat-exchanges the refrigerant, which is supplied through the first electrical four-way valve. The temperature raising device heats a pipe, to which the refrigerant flows from the expansion valve, by the remaining heat supplied from the heat exchanger, and raises the temperature of the refrigerant.
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