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A new version of a solar water heating system coupled with a solar water pump

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  • Sutthivirode, Kittiwoot
  • Namprakai, Pichai
  • Roonprasang, Natthaphon

Abstract

This research target was to improve the thermal efficiency of a solar water heating system (SWHS) coupled with a built-in solar water pump. The designed system consists of 1.58-m2 flat plate solar collectors, an overhead tank placed at the top level, the larger water storage tank without a heat exchanger at the lower level, and a one-way valve for water circulation control. The discharge heads of 1 and 2 m were tested. The pump could operate at the collector temperature of about 70-90 °C and vapor gage pressure of 10-18 kPa. It was found that water circulation within the SWHS ranged between 15 and 65 l/d depending upon solar intensity and discharge head. Moreover, the max water temperature in the storage tank is around 59 °C. The max daily pump efficiency is about 0.0017%. The SWHS could have max daily thermal efficiency of about 21%. It is concluded that the thermal efficiency was successfully improved, except for the pump one. The new SWHS with 1 m discharge head or lower is suitable for residential use. It adds less weight to a building roof and saves electrical energy for a circulation pump. It has lower cost compared to a domestic SWHS.

Suggested Citation

  • Sutthivirode, Kittiwoot & Namprakai, Pichai & Roonprasang, Natthaphon, 2009. "A new version of a solar water heating system coupled with a solar water pump," Applied Energy, Elsevier, vol. 86(9), pages 1423-1430, September.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:9:p:1423-1430
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    References listed on IDEAS

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    1. Khalifa, Abdul-Jabbar N., 1998. "Forced versus natural circulation solar water heaters: A comparative performance study," Renewable Energy, Elsevier, vol. 14(1), pages 77-82.
    2. Roonprasang, Natthaphon & Namprakai, Pichai & Pratinthong, Naris, 2008. "Experimental studies of a new solar water heater system using a solar water pump," Energy, Elsevier, vol. 33(4), pages 639-646.
    3. Wong, Y. W. & Sumathy, K., 1999. "Solar thermal water pumping systems: a review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 3(2-3), pages 185-217, June.
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    Cited by:

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    6. Ji, Jie & Wang, Yanqiu & Yuan, Weiqi & Sun, Wei & He, Wei & Guo, Chao, 2014. "Experimental comparison of two PV direct-coupled solar water heating systems with the traditional system," Applied Energy, Elsevier, vol. 136(C), pages 110-118.
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    8. Subiantoro, Alison & Ooi, Kim Tiow, 2013. "Analytical models for the computation and optimization of single and double glazing flat plate solar collectors with normal and small air gap spacing," Applied Energy, Elsevier, vol. 104(C), pages 392-399.

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