Experimental studies of a new solar water heater system using a solar water pump
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Publication Details
Author list: Roonprasang N., Namprakai P., Pratinthong N.
Publisher: Elsevier
Publication year: 2008
Journal: Energy (0360-5442)
Volume number: 33
Issue number: 4
Start page: 639
End page: 646
Number of pages: 8
ISSN: 0360-5442
Languages: English-Great Britain (EN-GB)
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Abstract
The research goal was to develop a new solar water heater system (SWHS) that used a solar water pump instead of an electric pump. The pump was powered by the steam produced from a flat plate collector. Therefore, heat could be transferred downward from the collector to a hot water storage tank. The designed system consisted of four panels of flat plate solar collectors, an overhead tank installed at an upper level and a large water storage tank with a heat exchanger at a lower level. Discharge heads of 1, 1.5 and 2 m were tested. The pump could operate at the collector temperature of about 70-90ฐC and vapor gage pressure of 7-14 kPa. It was found that water circulation within the SWHS ranged between 12 and 59 l/d depending on the incident solar intensity and system discharge head. The average daily pump efficiency was about 0.0014-0.0019%. Moreover, the SWHS could have a daily thermal efficiency of about 7-13%, whereas a conventional system had 30-60% efficiency. The present system was economically comparable to a conventional one. ฉ 2008 Elsevier Ltd. All rights reserved.
Keywords
Economy, Solar water heater system, Steam power
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