线性唯象传热规律下复杂系统的热力学优化  

Thermodynamic Optimization of a Complex System under a Linear Phenomenological Heat Transfer Law

作　　者：李俊[1] 陈林根[1] 孙丰瑞[1] 

机构地区：[1]海军工程大学研究生院,湖北武汉430033

出　　处：《热能动力工程》2008年第2期153-156,共4页Journal of Engineering for Thermal Energy and Power

基　　金：教育部新世纪优秀人才支持计划基金资助项目(NCET-04-1006);全国优秀博士学位论文作者专项基金资助项目(200136)

摘　　要：实际传热过程并不总是服从牛顿传热规律,传热规律对循环性能有很大影响。利用非平衡热力学中常用的传热规律——线性唯象传热规律,对复杂系统进行了研究。该复杂系统包括若干不同温度的热源、有限热容子系统和一个变换器(热机或制冷机)。利用拉格朗日方程得到了变换器的工质最优温度和子系统的最优自由温度,求出了系统相应的最大功率输出,并与牛顿传热规律下的结果进行了比较,计算方法为计算实际复杂系统的温度分布和能量界限提供了一种途径。A real heat transfer process does not always follow Newton's heat transfer law and the heat transfer law,however,exercise an enormous influence on the thermodynamic cycle performance.The authors have utilized a commonly used heat transfer law in non-equilibrium thermodynamics,namely,a linear phenomenological heat transfer law,to study a complex system.The latter involves several heat sources at different temperatures,a finite heat capacitance sub-system and a transformer (heat engine or refrigerator).The optimum temperature of the working medium of the transformer and the optimum free temperature of the sub-system have been obtained by using Lagrange Equation.The corresponding maximum power output of the system has also been determined and compared with that calculated by using Newton's heat transfer law.The calculation method under discussion can provide an approach for the calculation of the real temperature distribution and energy limits of a practical complex system.

关 键 词：线性唯象传热定律 复杂系统 热力学优化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]