Abstract
Solar domestic hot water systems (referred to as SDHWS in the paper) with flat-plate collectors have been widely installed in residential and office buildings for the water heating due to their reliable performance, low cost and minimal need for maintenance. However, the substantial fear of the damaging due to the freezing of collectors has apparently hampered their popularization in the areas with cold winters, even in the areas with mild winters. Just like a water pipe, one approach to the anti-freezing of collectors is to make the water inside the collectors flow. For a thermosyphonic SDHWS, this can be achieved by appropriate measures which make the systems produce thermosyphonic or reverse circulation. The object of this study is to investigate the temperature depression of collector absorbers at nights and the feasibility to employ reverse flow of thermosyphonic SDHWS for anti-freezing under climatic conditions of Yunnan, China.
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References
Zhimin Li, Runsheng Tang, Chaofeng Xia, Huilong Luo and Hao Zhong. Towards green rural energy in Yunnan, China. Renewable Energy (in press).
Chaofeng Xiao, Huilong Luo, Runsheng Tang and Hao Zhong. Solar thermal utilization in China. Renewable Energy 2004; 29/9:1549–1556.
Bruce AW and Charles SB. Freeze protection for flat-plate collector using heating. Solar Energy 1977, 19:745–746.
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© 2008 Tsinghua University Press, Beijing and Springer-Verlag GmbH Berlin Heidelberg
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Tang, R., Li, Z., Sun, Z., Yu, Y., Zhong, H. (2008). On the Anti-Freezing of Flat-Plate Collectors in Sdhws Under Climatic Conditions of Yunnan, China. In: Goswami, D.Y., Zhao, Y. (eds) Proceedings of ISES World Congress 2007 (Vol. I – Vol. V). Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-75997-3_131
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DOI: https://doi.org/10.1007/978-3-540-75997-3_131
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-75996-6
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