| 摘要 |
PURPOSE:To effectively and rationally utilize the heat of an engine by disposing an inlet from which hot water inside a tank is tanken out as engine coolant at a position higher than a radiator in the tank, and disposing an outlet of the used hot water into the tank at a position higher than the coolant inlet. CONSTITUTION:When a heat pump 2 is operated, thermal medium circulates in a pipe 17, is heated by exchanging heat with the ambient air in a spiral section 29, is further heated by exchanging heat with the exhaust gas of an engine 3 in a spiral section 28, is still more heated by being compressed by a heat pump compressor 36, whereupon the high-temperature thermal medium is supplied to a radiator 4 in which it is cooled by exchanging heat with the hot water in a tank 1. At this moment, the hot water in a downwardly extending tube 8 is subjected to the first stage heating by exchanging heat with the thermal medium in the radiator 4. Then, the heated hot water staying on the top of the downwardly extending tube 8 is sucked from the coolant inlet 5 by a pump 2 to cool the engine 3, and, at the same time, the hot water is subjected to the second stage heating, whereupon it returns to the top of the tank 1 from a coolant outlet 6 and is subjected to the third stage heating by exchanging heat with the exhaust gas in a winding section 24 of the exhaust pipe 2. |
