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Tania Ullah, National Institute of Standards and Technology |
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William M. Healy, Ph.D., National Institute of Standards and Technology |
In the effort to achieve net-zero operation of residential buildings, advanced water heating technologies are vitally important. Solar thermal is the most cost and energy efficient, renewable energy alternative for water heating, but the use of electric resistance as the backup to solar thermal may no longer be the most suitable option. This paper explores the year-long performance of a 189 liter (50 gallon) heat pump water heater (HPWH) serving as an auxiliary unit to an active indirect solar thermal water heater with a 303 liter (80 gallon) storage tank in a net-zero energy test home at the National Institute of Standards and Technology, Gaithersburg campus.
See more of: Heat Pump Applications for Domestic Hot Water