[Greenbuilding] Ductless Heat Pump Performance - November 2011
Paul Eldridge
paul.eldridge at ns.sympatico.ca
Fri Dec 2 20:10:45 CST 2011
We have a forty-three year old, 2,500 sq. ft. Cape Cod and in past years
when we heated with oil exclusively, our fuel oil consumption averaged
about 2,000 litres a year (space heating and domestic hot water).
Today, virtually all of our space heating needs are satisfied by two
ductless heat pumps and our DHW is heated electrically. Each of these
loads is individually metered and a breakout of our consumption for
November can be viewed at:
http://i362.photobucket.com/albums/oo69/HereinHalifax/HP-Nov2011.jpg
A summary of our heat pump savings for the months of October and
November can be viewed at:
http://i362.photobucket.com/albums/oo69/HereinHalifax/ONHPR.jpg
For the first sixty-one days of this heating season (i.e., October 1st
through November 30th), our heat pumps have consumed a combined total of
498.6 kWh or an average of 8.2 kWh per day. This is the energy
equivalent of 0.93 litres or 0.25 US gallons of fuel oil a day at 82%
AFUE and an indoor set temperature of 20°C.
Our goal this year is to get our total household consumption below the
10,000 kWh mark which, if we should succeed, would put us in the range
of 43 kWh/m2. In an effort to further minimize our ecological impact,
100 per cent of the electricity that we use is wind or low-impact hydro
sourced through Bullfrog Power (http://www.bullfrogpower.com/).
Cheers,
Paul
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