| 摘要 |
PURPOSE:To provide a heat exchanger in which the draining property of condensed water is improved by applying hydrophilic machining to the leeward side end part of a porous tube. CONSTITUTION:A coolant inlet tube 3 and a coolant outlet tube 5 are brazed to the opening end of a porous tube 1, and thereafter a hydrophilic film 20a is coated on the rear end portion of the leeward porous tube 1. When air flows into the heat exchanger from the direction shown by an arrow A, the moisture contained in air is condensed on the porous tube 1 which has been cooled to a temperature lower than the dew point of air by a coolant within the tube and the surfaces of fins 2, and the moisture grows to water drops within the heat exchanger. The water drops 10 are blown together to the leeward side end part of the porous tube in accompaniment with an airstream along the surfaces of the fins. Since a hydrophilic film 20a is coated on the leeward side end part of the porous tube, draining downward of the heat exchanger is excellently carried out along the porous tube. That is, in the vicinity of the porous tube, water film streams along the direction of the leeward tube end and the downward of the longitudinal direction of the porous tube are constantly formed. Waterdrops at the leeward end parts are drained smoothly by being guided by the waterdrops. Hence, waterdrops are prevented from splashing into the compartment of a car in accompaniment with the airstream.
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