Building America Industrialized Housing Partnership -
[Cached Version]
Published on: 1/14/2008
Last Visited: 2/3/2009
When the outside temperature is between -15ºC and -27ºC (5ºF and -17ºF), the HRV runs in defrost mode for nine minutes every 30 minutes, and 20 minutes every 30 minutes when the outside temperature is below -27º C (-17ºF). (Forest) During 2003-2004, the HEPA 3000 was in defrost mode for about 9 hours.
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The net efficiency has been evaluated from the gross temperature recovery efficiency (defined as apparent effectiveness in CSA C439) to which several penalties were subtracted: unbalance factor, exhaust air transfer, casing air leakage, casing heat gain/losses, defrost energy (when applicable) and fan energy. (Forest)
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Special thanks to Daniel Forest, Venmar Ventilation Inc.
Additional support has been provided by: The Bonneville Power Administration, the Florida Solar Energy Center, the Washington State University Extension Energy Program, the Nez Perce Tribe, Kit Manufacturing, Clearwater Homes and the Northwest Energy Efficient Manufactured Home Program.