摘要
板翅式换热器动态特性的复杂性在于其通道间有翅片导热存在．本文从分析翅片的定态和非定态导热过程入手，建立了包括考虑隔板热容的通用平行流多流体板翅式换热器的动态数学模型．该数学模型能以热阻网络图形式加以描述，通过对热阻网络的变换，获得了可快速求解的三对角阵代数方程组．用此模型计算了两股流板翅式换热器和四股流板翅式换热器的动态响应过程，对流体流量（或进口温度）扰动，理论的预测结果与实验数据相当一致．
The complexity of the dynamic characteristics of plate-fin heat exchangers is the existence of fin conduction between channels.The steady-state and unsteady-state conduction of fins was analyzed,and a general dynamic model of multi-fluid plate-fin heat exchangers including separator sheet’s heat-capacity was developed.The mathematical model,in partial differential equations,can also be expressed by the form of dynamic thermal resistance network of plate-fin heat exchangers.By the transformation of the dynamic thermal resistance network,the model was represented by algebraic equations of a tridiagonal matrix which can be solved easily and quickly.By using this model,the dynamic responses of both two-stream plate-fin heat exchanger and four-stream plate-fin heat exchanger were preeicted for fluid flow,or inlet tempeatue petubations.The calculated results were in good agreement with test data．
出处
《化工学报》
EI
CAS
CSCD
北大核心
1998年第6期721-728,共8页
CIESC Journal
基金
上海市自然科学基金!No.(92)BF0101
关键词
板翅式
换热器
动态特性
数学模型
平行流
plate-fin heat exchanger,dynamic characteristics,mathematical model,heat transfer calculation
