Influence of the flow rate and the tank stratification degree on the performances of a solar flat-plate collector

被引:73
作者
Cristofari, C [1 ]
Notton, G [1 ]
Poggi, P [1 ]
Louche, A [1 ]
机构
[1] Univ Corse, CNRS, UMR 6134, Ctr Rech Energie & Syst, F-20000 Ajaccio, France
关键词
solar flat-plate collector; copolymer; stratified tank; flow rate; modeling; performance;
D O I
10.1016/S1290-0729(02)00046-7
中图分类号
O414.1 [热力学];
学科分类号
摘要
Using a thermal model of finite differences, the performances of a solar flat-plate thermal collector wholly manufactured in a copolymer material is studied in low flow conditions. The influences of the flow rate and the stratification of the tank are analysed. Thermal performances, productivity and efficiency of such a solar system (collector with surface of 2 m(2) and a storage tank of 150 litres) are presented for a Mediterranean site. Such a system presents a yearly mean efficiency of about 55.5% and 53.0% and the annual mean of daily productivities are 4.98 kWh and 4.75 kWh for, respectively, high thermal stratified tank and fully mixed tank. These results show that a stratified tank has much higher performances than a fully mixed tank. With high degree of stratification saving energy is higher (5.25% over one year of use) than fully mixed tank. The use of polymer materials reduces the collector weight by 50% in comparison with a traditional metal collector, what implies an easier installation. (C) 2003 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
引用
收藏
页码:455 / 469
页数:15
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