| 摘要 |
PROBLEM TO BE SOLVED: To provide a condensation sensor capable of detecting dew condensation water existing on the surface of a heat exchanger, while preventing corrosion of a component forming a coolant passage, with a simpler constitution than hitherto.SOLUTION: The condensation sensor 30 for detecting dew condensation water existing on the surface of an evaporator 20 includes: a first metal member 33 constituted of the same metal as a tube 21 of the evaporator 20; and a second metal member 35 constituted of a metal having a lower natural potential than the metal constituting the first metal member 33, and arranged in the noncontact state with the first metal member 33. The condensation sensor 30 has a constitution wherein, when dew condensation water exists between the first metal member 33 and the second metal member 35, a local cell using the first metal member 33 and the second metal member 35 as electrodes is formed, and dew condensation water is detected based on an electromotive force of the local cell. |
