| 摘要 |
PROBLEM TO BE SOLVED: To provide a triple tube heat exchanger capable of achieving improvement of quality with respect to performance and safety and reduction of the cost with the usage of an inexpensive smooth tube without addition of a member in the triple tube heat exchanger (gas cooler) having a leakage detection groove therein used for a heat pump type hot water supply device. SOLUTION: This triple tube heat exchanger comprises an inner tube 1, an intermediate tube 2 and an outer tube 3, a plurality of protrusions 4 are formed on an inside of the outer tube 3 by denting the outer tube 3 from the outer side to the inner side, a space between the intermediate tube 2 and the outer tube 3 is a flow passage of carbon dioxide gas, and the inside of the inner tube 1 is a flow passage of water, and thereby, improvement of performance and safety and reduction of the cost can be achieved. COPYRIGHT: (C)2007,JPO&INPIT
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