Experimental studies of a new solar water heater system using a solar water pump |
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Authors: | Natthaphon Roonprasang Pichai NamprakaiNaris Pratinthong |
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Affiliation: | Division of Energy Technology, School of Energy Environment and Materials, King Mongkut''s University of Technology Thonburi, Thungkhru, Bangkok 10140, Thailand |
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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 70–90 °C 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. |
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Keywords: | Solar water heater system Solar water pump Steam power Economy |
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