To provide a multi-wound type double pipe heat exchanger capable of improving heat exchange efficiency as well as improving space efficiency.
A double pipe 41 is formed by a straight part 45 and an elbow part 48 and is wound so that the straight part 45 and the elbow part 48 overlap on themselves. Thus, a part where the double pipe 41 overlaps on itself is formed in a square. A refrigerant from a receiver is provided between an outer pipe and an inner pipe of the double pipe 41 and a refrigerant of which temperature is lowered as passing through an electronic expansion valve is provided to the inner pipe. Thus, heat exchange between inside refrigerant and outside refrigerant of the inner pipe is conducted via the inner pipe. Then, as the straight part 45 is provided for the double pipe 41, heat exchange efficiency is improved. In addition, formed in a square, the double pipe 41 can be efficiently set in a casing for storing the multi-wound type double pipe heat exchanger 40. As a result, heat exchange efficiency can be improved as well as improving space efficiency.
SASAKURA MASAHIKO
YAMAGUCHI TORU
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