混合蒸汽在板式换热器中的凝结换热特性  

The Characteristics of Heat Transfer Coefficient in Plate Heat Exchanger for Mixed Vapor

作　　者：乔宏斌[1] 王顺[1] 胡申华[1] 

机构地区：[1]南京工程学院电力仿真与控制工程中心,江苏南京211167

出　　处：《节能技术》2016年第4期334-338,361,共6页Energy Conservation Technology

基　　金：国家自然科学基金资助项目(51166013)

摘　　要：本文通过设计搭建板式换热器凝结换热实验台,研究了不同酒精浓度(0%,1%,2%,5%,10%,20%)、不同蒸汽压力(31.2 k Pa,47.4 k Pa,84.5 k Pa)下,定质量流量的酒精-水混合蒸汽在板式换热器中凝结换热系数随冷却水温的变化特性。实验结果表明:随着冷却水温的增大,换热系数随之增大,几乎呈现出线性变化的关系;低浓度的混合蒸汽(1%,2%)明显高于纯水蒸气的换热系数,随着浓度增大,换热系数下降;随着压力增大,换热系数增强。沿蒸汽流动的方向,换热系数是逐渐下降的。An experimental system has been established in the present study to measure the condensation heat transfer coefficient of ethanol - water vapor mixtures in a vertical plate. The experiment was carried out under different pressure （31.2 kPa,47.4 kPa,84.5 kPa） and different mass concentration alcohol of gas phase （0% , 1% ,2% ,5% , 10% ,20% ）. The vapor mass flux remained constant during experiment. The results showed that, with cooling water rising, heat transfer coefficient increased. The condensation heat transfer coefficient almost increased linearly with the cooling water temperature. The HTC of low concentration vapor （1% ,2% ） was obviously greater than that of pure water vapor. The HTC decreased with increase of vapor concentration. The vapor pressure is greater, the heat transfer coefficient is higher. The HTC gradually decreased along direction of vapor flow.

关 键 词：节能 换热增强 板式换热器 凝结换热系数 水-酒精混合蒸汽 

分 类 号：TK121[动力工程及工程热物理—工程热物理]