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Permalink Reply by Michael J. Mayhew on August 4, 2011 at 7:57am
Permalink Reply by Brian Christensen on August 5, 2011 at 1:42pm Hi Elizabeth -- If you look at the last page of this article (http://www.luntmarymor.com/condensing_heaters.pdf), you'll see a nice description of how EF is measured. From this, and factoring in the additional consumption that Michael mentioned, you can probably come up with a reasonable approximation of the EF for your scenario. The toughest part may be to figure out the standby losses, if the DHW is a tank-type system.
Note that in REM the EF is entered as a decimal, not a percentage -- and for a heat pump, the decimal will be larger than 1.0.
Permalink Reply by Dave Dysson on August 5, 2011 at 6:49pm
Permalink Reply by Dave Dysson on August 5, 2011 at 7:15pm
Permalink Reply by Elizabeth Guinn on August 8, 2011 at 5:02am Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.
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