| 摘要 |
PROBLEM TO BE SOLVED: To suppress cost increase due to increase of joints of water piping and coolant piping, to secure reliability, and to eliminate the need for water piping and coolant piping joining space, by continuously forming passage enlargement of a water piping outlet part, and preventing clogging and performance deterioration due to deposition of scales in tap water. SOLUTION: The twisted tube type heat exchanger is provided with: the water piping 2 with a plurality of rows of ridge and trough parts continuously and spirally provided per each row on an outer circumference; and a plurality of coolant pipings 3 spirally wound along shapes of the ridge and trough parts of the water piping 2 outer circumference. It is characterized by that a predetermined length portion in a water piping 2 outlet side is provided as a bare pipe part 2d not having a spiral shape. COPYRIGHT: (C)2008,JPO&INPIT
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