| 摘要 |
PURPOSE:To enable hot water flow control to be achieved by means of a cheap device by providing such constitution as including a bypass piping detouring a heat exchanger for inducing heat exchange between the cooling water of an internal combustion engine and air, and controlling the passage of cooling water toward the heat exchanger or the bypass piping by means of two closing valves. CONSTITUTION:An air conditioner mounted on a bus body is provided with a hot water circuit 4 including a heater core 2 for heating the inside of a vehicle cabin and a defroster core 3 for preventing frost on front glass. The hot water circuit 4 is sequentially connected to the water jacket of an engine 1 and a cooling water circuit 6 circulating along the water jacket and radiator 5 of the engine 1 and cooling water is circulated there by the operation of a water pump 7. In this case, a bypass piping 9 detouring the heater core 2 is provided as well as provision of a solenoid valve 8 for opening/closing a hot water piping 4a upstream from the heater core 2, and a defroster solenoid valve 10 is pro vided on the way. And these solenoid valves 8, 10 are so designed that when one of these valves 15 is closed, the other one is opened. |
