摘要
本文基于对换热器结构特点和换热特点的认识,在未知冷热流体出口温度的情况下,通过数学推导,不仅求解得到了换热器的换热量和出口温度,而且得到了换热量和流体温度在换热器中具体分布的表达式。同时基于求解得到的冷热流体出口温度,对换热器设计中的■耗散均匀性原则进行了分析,发现对于同一换热器,相同的冷热流体进口温度、热容流量,■耗散一定而且是取得最小值时,并不能保证局部■耗散的均匀性。
Based on the understanding of structure and heat transfer characteristics of heat exchanger,the quantity of heat exchange and the outlet temperatures of hot and cold fluids are obtained through math deduction.Moreover,their specific distributions in heat exchanger are expressed.Next,the principle of equipartition of entransy dissipation is analyzed by means of the outlet temperatures of hot and cold fluids solved.It is found that for a heat exchanger with fixed inlet temperatures and fixed heat capacity rates of hot and cold fluids,when the total entransy dissipation has a certain minimum value,the equipartition of local entransy dissipation cannot be guaranteed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第5期1050-1054,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51576115)
关键词
换热器
流体温度
[火积]耗散
heat exchanger
fluid temperature
entransy dissipation
