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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. 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.
    2. 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.
    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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