Analysis of the performances of heat exchangers used in hot-water stores

被引：13
|
作者：
Figueiredo, AR
Raimundo, AM
机构：
[1] Department of Mechanical Engineering, Faculty of Sciences and Technology, University of Coimbra
来源：
APPLIED THERMAL ENGINEERING | 1996年 / 16卷 / 07期
关键词：
heat exchanger coils; sensible heat water store; dimensionless analysis; transient thermal storage analysis; lumped heat capacity hypothesis;
D O I：
10.1016/1359-4311(95)00043-7
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The thermal response of a hot-water store and the thermal discharge characteristics from heat exchanger coils placed inside have been experimentally investigated. The analysis of the experimental results shows that it is possible to describe the thermal behaviour of these systems by the use of a convenient set of dimensionless parameters. Two different geometric configurations of the heat-exchanger coils were investigated, namely the classic cylindrical coil and the flat spiral coil, this last one presenting a greater heat transfer efficiency. The hypothesis of a lumped heat capacity for the thermal evolution of the water store enables the construction of a simplified theoretical model. The solution of which, obtained by a numerical method, predicts with reasonable accuracy the time evolutions of both the average temperature of the water tank and of the inlet-outlet temperature difference of the circulating water. Copyright (C) 1996 Elsevier Science Ltd
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页码：605 / 611
页数：7
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