09 Jan '14, 11am

Minisplit Heat Pumps and Zero-Net-Energy Homes

10 – Minisplits are not yet drop-in replacements for fossil-fuel furnaces and boilers in conventional housing, but we’ve been applying them selectively in cases where the existing system is due for replacement. Surprisingly, from a source energy point of view they reduce carbon emissions. On one project, a single oil boiler heated and provided hot water to two adjoining homes totaling 7,500 square feet. It was replaced by three Daikin Altherma air-to-water heat pumps and two electric boilers (for severe weather – the Althermas hadn’t enough capacity, and more importantly, high enough temperature water at low outdoor temperatures). Annual electrical usage into the new system was just under 20,000 kWh. Oil consumption before the retrofit was 3,187 gallons/year, with associated CO2 emissions of 71,389 lbs/year. Using the EPA eGrid figure of 728 lbs CO2/MWh for the NEWE genera...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/guest-blog...

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