EXHAUST HEAT COLLECTION DEVICE

To heat cooling water by the heat of an exhaust gas, and to selectively and effectively utilize the cooling water, in an exhaust heat collection device.SOLUTION: In an exhaust heat collection device 10, a heater core 14 and an exhaust heat collector 16 are arranged in parallel with an exhaust heat collection passage 40 between a derivation passage 26 through which the cooling water from an engine 12 is withdrawn, and an introduction passage 28 through which the cooling water is returned to the engine 12 once again, and changeover means 18 is arranged which can switch a circulation direction of the cooling water so that either of the heater core 14 and the exhaust heat collector 16 is located at an upstream side. By this constitution, when a temperature of the cooling water is not higher than a prescribed temperature, the purification performance of an exhaust gas is enhanced by supplying the cooling water which is heated by the exhaust heat collector 16 to a catalyst of an exhaust system, and on the other hand, when the temperature of the cooling water reaches the prescribed temperature or higher, the heating performance of an air conditioner including the heater core 14 can be enhanced by supplying the cooling water which is heated by the exhaust heat collector 16 to the heater core 14.SELECTED DRAWING: Figure 1 【課題】排気熱回収装置において排気ガスの熱によって冷却水を加熱して選択的且つ有効に活用する。【解決手段】排気熱回収装置１０において、エンジン１２から冷却水の取り出される導出通路２６と該冷却水が再びエンジン１２へと戻される導入通路２８との間に、ヒータコア１４及び排気熱回収器１６が排気熱回収通路４０に並んで配置されると共に、前記ヒータコア１４及び前記排気熱回収器１６のいずれかが上流側となるように冷却水の流通方向を切り替え可能な切替手段１８を備えている。これにより、冷却水が所定温度以下の場合には、排気熱回収器１６で加熱した冷却水を排気系統の触媒へと供給することで排気ガスの浄化性能を高め、一方、冷却水が所定温度以上となった場合には、排気熱回収器１６で加熱した冷却水をヒータコア１４へと供給することで、このヒータコア１４を含む空調装置の暖房性能を高めることができる。【選択図】図１