11 Sep '13, 2pm

Solar Hot Water: Which Is Better PV or Thermal?

Solar Hot Water: Which Is Better PV or Thermal?

For a long time now, the wisdom has been that the relative efficiency advantage of solar thermal technology for water-heating more than outweighs the convenience of electric water heating. The ability of solar thermal to collect more energy per square foot means that a solar electric system powering a conventional electric water heater alone will never compete with a solar thermal system. Recently, however, reductions in solar electric (PV) costs and maturation of air-to-water heat pump technology have provided a new model: solar-electric assisted heat pump water heating (HPWH). HPWH comes with fewer drawbacks than solar thermal, with a smaller price tag for residential applications. The information below assumes the use of a heat pump water heater with an efficiency factor (EF of 2.5) and an 1,800 kWh per year rating, with 1 to 1.3 kW of grid-tied PV added to existing ins...

Full article: http://www.renewableenergyworld.com/rea/news/article/2013...

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Solar Hot Water: Which Is Better PV or Thermal?

Solar Hot Water: Which Is Better PV or Thermal?

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@SEIA

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