板式换热器热力简化计算的精度分析  

The Precision Analysis in the Simplified Thermodynamic Calculation of the Plate-Heat-Exchanger

作　　者：吴继臣[1] 陈晓杰 

机构地区：[1]哈尔滨建筑大学 [2]哈尔滨市建筑设计院

出　　处：《哈尔滨建筑大学学报》1999年第2期50-53,共4页Journal of Harbin University of Civil Engineering and Architecture

摘　　要：分析了温度对板式换热器传热和阻力的影响，指出《实用供热空调设计手册》和某些厂家的板式换热器说明书在其传热和阻力计算中，不考虑温度对水的普朗特数、运动粘度和导热系数的影响作常数处理，对特定型号的板式换热器，把其传热系数和阻力简化为流速的函数，在有些情况传热面积误差可达50％，阻力误差可达200％，其精度不能满足工程设计的需要。Having analyzed the temperature influence in the transference of heat and resistance of fluid friction calculation of the plate-heat-exchanger, the paper pointed out that the calculation methods, which are introduced in PRACTICAL HEATING & AIR-CONDITIONING DESIGN MANUAL and some plate-heat-exchanger stylebooks, have not considered the temperature influence in water's prandtl number, dynamic viscosity and conductivity, dealt with the influence as a constant variable, and simplified the transmittance coefficient and resistance to a function of fluid rate of the given type of plate-heat-exchanger, then the calculating heat-transfer area error is about 50%, the calculating resistance error may reach 200%, and the precision of these methods do not meet the demands of en gineering designs.

关 键 词：板式换热器 物性参数 传热参数 阻力 空调 

分 类 号：TU831.4[建筑科学—供热、供燃气、通风及空调工程]