Journal article Open Access

Hourly Efficiency of Solar Water Collector

Nowarski, Joseph

Calculations of solar collector hourly energy output as part of central solar water heating system in multi-apartment building in Tel-Aviv.

Collector efficiency depends on solar radiation, collector temperature and ambient temperature.
Three iterations of calculations were applied, showing relatively small differences between the iterations. The calculated yearly efficiency is almost equal to the efficiency determined according to the national standard. Monthly efficiency is in the range of -5.2% to +3.4% difference from the efficiency determined according to the national standard. Higher efficiency is in winter. The maximum hourly efficiency is at 8 o’clock in July, 75.2%.

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  • Joseph Nowarski, Solar Israel – A practical and legislative model, Renewable Energy World, March-April 2000, p93-99

  • Joseph Nowarski, Energy Balance of Solar Water Heaters, academia.edu/34457200

  • Joseph Nowarski, Heat Transfer in Solar Water Heaters Pipes, academia.edu/34459205

  • Chromagen Solar Thermal Systems, chromagen.co.il, chromagen.com

  • Experimental Measurements of Hot Water Stratification in a Heat Storage Tank, iopscience.iop.org/article/10.1088/1757-899X/471/2/022014

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