NATURAL-CONVECTION HEAT-EXCHANGERS IN SOLAR WATER HEATING-SYSTEMS - THEORY AND EXPERIMENT

被引：30
|
作者：
PARENT, MG
VANDERMEER, TH
HOLLANDS, KGT
机构：
[1] Center for Solar Thermal Engineering, Department of Mechanical Engineering, University of Waterloo
来源：
SOLAR ENERGY | 1990年 / 45卷 / 01期
关键词：
D O I：
10.1016/0038-092X(90)90065-K
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Natural convection heat exchangers can be used in solar hot water systems to replace the pump on the tank side of the exchanger. There is currently no experimentally verified way of designing this type of heat exchanger. An experimental apparatus to test natural convection heat exchangers was built and an extensive set of measured data obtained on two different exchangers sized for low-flow stratified tank system. Two theoretical models for the exchanger are presented: a finite-volume primitive variable numerical solution of the fundamental laminar equations of fluid motion and a laminar forced-convection-based solution method. Comparison of the model predictions with the experimental data showed good agreement when the modified Rayleigh number is less than about 400. The poor agreement under other conditions was attributed to turbulence and recirculation neither of which was accounted for in the models. © 1990.
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页码：43 / 52
页数：10
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