Analytical studies on drop of H-W-B constants due to scaling in natural circulation flat plate solar water heater

U. C. Arunachala, L. K. Sreepathi, M. Siddhartha Bhatt

Research output: Contribution to journalArticle


It is observed that the performance of the natural circulation flat plate solar water heater (FSH) deteriorates faster due to scaling. This paper quantifies the effect of scaling on instantaneous efficiency as variation in Hottel-Whillier-Bliss (H-W-B) constants. The drop in a0 and a1 values with scale growth is evaluated and brought out as the H-W-B plot. The comprehensive analysis using developed software FLATSCALE reflects the deviation of circulating ratio with scale thickness. The individual and combined effect of mass flow rate and thermal resistance on the performance of FSH is also discussed.

Original languageEnglish
Pages (from-to)192-202
Number of pages11
JournalInternational Journal of Sustainable Energy
Issue number1
Publication statusPublished - 01-01-2014


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy(all)
  • Process Chemistry and Technology
  • Fluid Flow and Transfer Processes

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