[Greenbuilding] Ductless Heat Pump Performance - November 2011

Richard Garbary richard6 at gmail.com
Sat Dec 3 05:39:37 PST 2011


These are great numbers. I've been doing some homework on these systems for
a while. Does your heat pump incorporate "inverter" technology?


On Fri, Dec 2, 2011 at 9:10 PM, Paul Eldridge <paul.eldridge at ns.sympatico.ca
> wrote:

> 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<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<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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