| 摘要 |
PROBLEM TO BE SOLVED: To limit heat exchange amount without generating overheat when an exhaust temperature rises, in addition to ensuring sufficient heating ability by the assist of exhaust heat. SOLUTION: An operating fluid receiving exhaust heat by a heat receiving heat exchanger is guided to a radiating heat exchanger by a heat pipe 5 heat exchanging with conditioning air, and heat of the operating fluid flowing in the heat pipe 5 is released to the atmosphere by a radiation control means 8. In this way, according to a rise of exhaust temperature, when a heat exchange amount is made excessive, heat of the operating fluid in the heat pipe 5 is released to the atmosphere through the radiation control means 8 to limit a heat exchange amount, without increasing an engine cooling water temperature. |
