| 摘要 |
<p>PURPOSE:To ensure effective heat radiation from heating parts without increasing the size of a heat radiation fin by providing a parts box containing therein a compressor, an outdoor heat exchanger, a fan, and heating parts and including heat radiation fins thereon for radiating heat from the heating parts, and providing a main refrigerant piping connecting among the compressor and the outdoor heat exchanger, etc., and further cooling the heat radiation fins by branching a bypass refrigerant piping from the main refrigerant piping. CONSTITUTION:High temperature high pressure refrigerant gas compressed by a compressor 4 is fed to an outdoor heat exchanger 2 to become high temperature high pressure refrigerant fluid. Thereupon, as cooling overload operation is reached owing to high fresh air temperature, a pressure adjusting valve of a bypass refrigerant piping 18 is opened to permit part of the refrigerant fluid to flow into the bypass refrigerant fluid 18. As it passes through a drawing unit 20, it changes to a low temperature low pressure refrigerant fluid. Then, as it flows through part of a parts box 8 in close contact with heat radiation fins 9, it absorbs heat from the heat radiation fins 9 for its evaporation. Hereby, the heating parts in the parts box 8 radiate heat.</p> |
