检索结果-南通市图书馆

A comparison of optimization theories for energy conservation in heat exchanger groups

Chinese science Bulletin 2011年第4期56卷 449-454页

作者： chen qun wu jing wang moran pan ning guo zengyuan key laboratory for thermal science and power engineering of ministry of education Department of Engineering Mechanics Tsinghua University Beijing 100084 China department of Biological and Agricultural engineering University of California Davis CA 95616 USA College of Energy and power engineering Nanjing University of Aeronautics andAstronautics Nanjing 210016 China Earth and Environmental sciences Division Los Alamos National Laboratory Los A lamos NM 87545 USA

In general,thermal processes can be classified into two categories: heat-work conversion processes and heat transfer processes. Correspondingly,the optimization of thermal processes has to have two different criteria:the well known entropy generation minimization method and the recently proposed entransy dissipation maximization method. This study analyzes the thermal issues in a heat exchanger group,and optimizes the unit arrangements under different constraints based on a suitable optimization crite-rion. The result indicates that the principle of minimum entropy generation rate is valid for optimizing heat exchangers in a ther-modynamic cycle with given boundary temperatures. In contrast,the entransy dissipation maximization is more suitable in heat exchanger optimizations involving only heat transfer processes. Furthermore,the entropy generation rate induced by dumping used streams into ambient surroundings has to be taken into account,except for that originating from the hot and cold-ends of heat exchangers,when using the entropy generation minimization to optimize heat exchangers undergoing a thermodynamic cycle.

关键词：冷端换热器优化理论熵产生率节能传热过程热工过程转换过程过程优化

来源：