| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger which has the high efficiency of cooling and dehumidification. SOLUTION: Protrusive streaks 17 are provided in a wall surface of a water- cooled duct 14 of a water-cooled dehumidifier 13 of a washing/drying machine, and cooling water 15, which flows down on the wall surface, is guided in a zigzag state, so that a flow-down area can be enlarged.
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