| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger to prevent the occurrence of corrosion due to condensate and provide the high efficiency of heat exchange. SOLUTION: A heat-exchanger comprises a heat exchanger 40 for collection of a sensitive heat to absorb mainly the sensitive heat of exhaust gas; and a heat exchanger 50 for collection of a latent heat to absorb mainly the latent heat of exhaust gas. The efficiency of heat-exchange on the heat-exchanger 40 for collection of a sensitive heat is suppressed for setting to a low value in a range at which condensate generated by absorbing the latent heat of exhaust gas is not vapor-condensed, and the heat exchanger 50 for collection of a latent heat is covered with a film 53 to protect the heat-exchanger from corrosion due to the condensate. |
