势容损耗及熵产与导热优化

Dissipation of heat transport potential capacity and entropy production in heat conduction optimization

热量传递势容(势容)反映了物体的导热能力,在导热过程中势容有损耗,对应于势容损耗最小的导热过程效率最高,传热速率最大。熵反映了过程的可逆性,在导热过程中熵有增加(熵产),对应于熵产最小的过程是 损失最小的过程,这种过程最大程度地保持了系统作有效功的能力。讨论了势容损耗和熵产在导热优化中的作用,以圆形导热管为例,分析了这两种优化目标函数的差异。

Heat transportpotential capacity demonstratesthe heat conduction capacity of a body, it couldbepartially dissipated in the heat conduction process. The process with the least dissipation of heat transport potential capacity correspondsto thehighestheat conduction efficiency. Entropy demonstratesthe reversibility of any thermodynamic process. Entropy production appears in the processofheat conduction. Theprocess with the least entropy production corresponds to that with the least exergy dissipation, which retains the ability of doing useful work to the utmost extent. The functions of heat transport potential capacity and entropy production in heat conduction optimization are discussed, and the difference in heat conduction optimization of cylinder pipe is analyzed.