| 摘要 |
PROBLEM TO BE SOLVED: To provide a double multitubular heat exchanger made compact by shortening a heat exchange length. SOLUTION: The heat exchanger 1 is constituted by forming piping 2 comprising an outer tube 4 and two inner tubes 5A, 5B inserted in the outer tube 4, into predetermined wound shape, wherein CO<SB>2</SB>gas flows inside the inner tubes 5A, 5B, and water flows between the outer tube 4 and the inner tubes 5A, 5B. The inner tubes 5A, 5B are twisted in a spiral shape. The flow of water is thereby disturbed considerably to obtain sufficient turbulent flow to thereby increase the heat transfer rate of water on the outer surfaces of the inner tubes. As a result, heat exchange efficiency is improved, and the heat exchange length is shortened to attain compactness. COPYRIGHT: (C)2006,JPO&NCIPI
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