| 摘要 |
A plurality of each of said heat-exchanger coils each having a different winding diameter are provided between a header in the inlet side provided in an inlet tube and a header in the outlet side provided in the outlet tube so that the two headers are communicated to each other, and also a group of heat-exchanger coils each surrounded by another heat-exchanger coil having a larger diameter as compared to that of the former is provided.
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