期刊
RENEWABLE ENERGY
卷 32, 期 5, 页码 772-795出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2006.03.016
关键词
glass evacuated tube solar collector; absorber tube; beam irradiation; diffuse irradiation; shade
资金
- National Research Foundation of Korea [과C6A1806] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The thermal performance of a glass evacuated tube solar collector is numerically and experimentally investigated. The solar collector considered in this paper consists of a two-layered glass tube and an absorber tube. Air is used as the working fluid. The length and diameter of this glass tube are 1200 and 37 mm, respectively. Four different shapes of absorber tubes are considered, and the performances of the solar collectors are studied to find the best shape of the absorber tube for the solar collector. Beam irradiation, diffuse irradiation, and shade due to adjacent tubes are taken into account for a collector model to obtain a realistic estimation. In addition, a single collector tube with only beam irradiation is studied as a simplified model, and the results of the simplified model are compared to those of the collector model to identify the difference between these two models. The performance of a solar collector is affected by the shape of the absorber, incidence angle of solar irradiation, and arrangement of collector tubes. The results obtained from the simplified model are very different from those from the collector model, which considered not only beam and diffuse irradiation but also shade due to adjacent tubes. (c) 2006 Elsevier Ltd. All rights reserved.
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