传热过程中的不可逆性与能量贬值

IRREVERSIBILITY AND LOST AVAILIABLE ENERGY IN A HEAT TRANSFER PROCESS

本文以简单的换热器为例,分析了传热过程的不可逆性与能量贬值的差别。结果表明,这两者并不一致,有时不可逆性大的过程能量贬值程度反而小。这样我们可以通过改变流体温度或温度分布来实现强化传热或减少能量贬值。

Taking a counter-flow heat exchanger as an example, this paper analyzes the difference between the irreversibility of a heat transfer process and the lost available energy during the process. The result shows that the irreversibility is not equal to the lost available energy, in some case, the lost available energy is small when the irreversibility is large. This suggests that the heat transfer enhancement or the reduction of the lost available energy be realized by changing the temperature distribution.