| 摘要 |
PURPOSE:To permit to use water as an operating liquid by a method wherein first stage heat pipe is provided between exhaust gas and the upstream side path of air while second stage heat pipe is provided between the exhaust gas and the downstream side path of the air, in order to reduce the maximum operating temperature of the heat pipe. CONSTITUTION:In the first stage heat pipe 38, high-temperature exhaust gas contacts with high-temperature side evaporating section 39 and low-temperature air, not yet heated, contacts with low-temperature side condensing section. In the second stage heat pipe 42, the exhaust gas, whose temperature is reduced by the high-temperature side evaporating section 39 of the first stage heat pipe 38, contacts with the high-temperature side evaporating section 43 and the air, heated by the low-temperature side condensing section 40 of the first stage heat pipe 38, contacts with the low-temperature side condensing section 44. According to this constitution, the maximum operating temperature of the heat pipe becomes low and water can be used as the operating liquid of the heat pipe. Accordingly, expensive corrosion resistant material is not necessitated to be used for the heat pipe while the thickness of the heat pipe may be thinned and whereby the weight of the heat pipe may be reduced.
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