A three-dimensional performance analysis of all-glass vacuum tubes with coaxial fluid conduit

被引:42
作者
Han, Hyunjoo [1 ]
Kim, Jeong Tai [1 ]
Ahn, Hyun Tae [1 ]
Lee, Sang Jin [2 ]
机构
[1] Kyung Hee Univ, Coll Architecture & Civil Engn, Dept Architectural Engn, Yongin 446701, Gyeonggi Do, South Korea
[2] Hanyang Univ, Coll Engn, Dept Mech Engn, Seoul 133791, South Korea
关键词
three-dimensional analysis; solar tubular collectors; coaxial conduit; thermal performance;
D O I
10.1016/j.icheatmasstransfer.2007.11.006
中图分类号
O414.1 [热力学];
学科分类号
摘要
The thermal performance of a solar system composed of parallel, all-glass (double skin) vacuum tubes has been investigated by using a three-dimensional analytical model. Each vacuum tube is equipped with a coaxial fluid conduit for water to flow through and collect the sun's thermal energy. The space between the exterior of the fluid conduit and the glass tube is filled with antifreeze solution to facilitate heat transfer from the solar heated absorber surface to water and to prevent the functional problems due to freezing in frigid weather conditions. Different from one-dimensional analytical models, the three-dimensional model considered in the present analysis enables the prediction of spatial variation of water temperatures as it flows through the coaxial conduit. This is quite useful in extracting major variables for the operation of the solar system using all-glass vacuum tubes as considered in the present investigation. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:589 / 596
页数:8
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