| 摘要 |
PROBLEM TO BE SOLVED: To provide high heat exchange efficiency by a comparatively simple composition in a heat exchanging device carrying out heat exchange between cooling water and high temperature gas by a cooling water passage formed around a high temperature gas flow passage, and a sub-passage of the high temperature gas in the cooling water passage. SOLUTION: Exhaust sub-passages 20c are formed in the cooling water passages 20d, 20e such that heat exchange with the cooling water is carried out in both inner and outer sides, and a gap is alternately wide and narrow in a circumferential direction. A cross-section shape of the exhaust sub-passage 20c of a wide gap portion is not symmetric with respect to an axis Za. By this, exhaust can secure a sufficient passage area in the wide gap portion, and it is easily subjected to heat absorption from cooling water. Since the sub-passage is not symmetric, flows of the exhaust and the cooling water are agitated to some extent, changing of each fluid between a center area of each flow and a portion contacting a cylindrical partition member becomes easy, and heat exchange is carried out more effectively. COPYRIGHT: (C)2008,JPO&INPIT
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