Realistic Hot Water Draw Specification for Rating Solar Water Heaters: Preprint

Research output: Contribution to conferencePaper


In the United States, annual performance ratings for solar water heaters are simulated, using TMY weather and specified water draw. A more-realistic ratings draw is proposed that eliminates most bias by improving mains inlet temperature and by specifying realistic hot water use. This paper outlines the current and the proposed draws and estimates typical ratings changes from draw specificationchanges for typical systems in four cities.
Original languageAmerican English
Number of pages10
StatePublished - 2012
Event2012 World Renewable Energy Forum - Denver, Colorado
Duration: 13 May 201217 May 2012


Conference2012 World Renewable Energy Forum
CityDenver, Colorado

NREL Publication Number

  • NREL/CP-5500-54539


  • draw profile
  • mains temperature
  • ratings
  • solar water heaters


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