Engine exhaust heat recovering apparatus

摘要

A circulating path (12) is provided for circulating a heat transfer medium across the cooling section (6A) and an exhaust heat exchanger (9). The circulating path (12) is communicated to an output heat exchanger which is mounted on a hot water storage. The heat transfer medium is circulated by a pump (10) from the exhaust heat exchanger (9) to the oil heat exchanger (5) and the cooling section (6A). The heat transfer medium to be introduced into the exhaust heat exchanger (9) is so controlled in the flow rate that a temperature of the water vapor in the exhaust gas is declined to a temperature lower than the dew point. The heat transfer medium when having received heat directly from the exhaust gas and heat generated by condensation of the exhaust heat is conveyed to the cooling section (6A) where its temperature soars up further.