PURPOSE: To improve cooling and heating capacities by forming a heat exchanger of a tube for feeding refrigerant or a tube and fins, and forming the tube in a shape for sequentially increasing a sectional area of refrigerant flow flowing in the tube along a flowing direction of the refrigerant.
CONSTITUTION: An outdoor heat exchanger 5 is formed of a tube 13 bent continuously in an S shape and fins 15S. Latent heat of the air to be condensed to the par to pass through the fins 15 by a blower 17 of an outdoor unit is derived of refrigerant gas fed in a high temperature and high pressure gas state from a compressor 1 to become liquid state. The tube 13 is reduced in its inner diameter of an inlet side 13a and sequentially increased in its inner diameter toward an outlet side 13b. The tubes 13 molded in the same sectional area may be sequentially so increased in number of buses to two, three from the inlet side 13a to the outlet side 13b. Thus, cooling and heating capacities can be improved.
SANO TETSUO
ARAI YASUHIRO
IWANAGA TAKAYOSHI
YAMASHITA TETSUJI
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