| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger hardly generating clogging caused by water scale in a water flow passage, concerning a double-pipe heat exchanger wherein a coolant flows in a small diameter pipe and water flows in a large diameter pipe, such as a water heater using high-temperature and high-pressure CO<SB>2</SB>gas as the coolant. SOLUTION: The small diameter pipe (1) and the large diameter pipe (2) are arranged coaxially through a gap on a straight line part of an axis, and the axis of the small diameter pipe (1) is bent meanderingly. In this heat exchanger wherein a heating fluid (3) flows in the small diameter pipe (1) and water (4) to be heated flows in the large diameter pipe (2), a passage sectional area of the water (4) between the small diameter pipe (1) and the large diameter pipe (2) is formed larger on the downstream side where the water (4) flows than on the upstream side. The passage sectional area of the water between the small diameter pipe and the large diameter pipe is formed larger on the downstream side where the water flows than on the upstream side. COPYRIGHT: (C)2004,JPO
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