| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-pipe heat exchanger by a simple fixing method for a copper pipe and an aluminum pipe, having a positive leakage detection function, and capable of reducing manufacturing cost, in regard to a double-pipe heat exchanger (a gas cooler) using the copper pipe for an inner pipe and the aluminum porous C-pipe for an outer pipe, used in a heat pump type water heater or the like. SOLUTION: The double-pipe heat exchanger comprises the copper-made inner pipe 1, and the outer pipe 2 made of aluminum and has a plurality of porous passages 4 by extrusion, the porous passage 4 is used as a passage for coolant gas, and the inner pipe 1 is a passage for water. By providing the outer pipe 2 as a cylindrical porous C-pipe with one end opened in a pipe cross section, the positive leakage detection function is provided, the fixing method of the inner pipe 1 and the outer pipe 2 is simple, and the reduction of the manufacturing cost becomes possible. COPYRIGHT: (C)2007,JPO&INPIT
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