RemRate allows for a ground source heat pump and you can couple it to the domestic hot water system.  However I need to convert the Water Furnace's 5.0 COP to an equivalent EF.  Any ideas?????

Views: 268

Reply to This

Replies to This Discussion

One would be tempted to put in 500%, but refrain, the stated COP is just for the unit, not the HP system, which will include pumping power and other distribution losses.  Probably system COP closer to 3.

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.

I was looking at REM/Rate and the GSHP only needs COP entered. It looks like you only need to model the type of water heater you are using for EF and also check desuperheater in the heat pump section if they are coupled.
Also to add the pump watts. Are you using the GSHP to supply 100% of the domestic hot water?
Thanks for the help.  Didn't want to reinvent the wheel if someone had already been down this path.

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Profile IconKimberly Loewen, Bob Whelan, Russ Pittis and 1 more joined Home Energy Pros
1 hour ago
Kari Sauder replied to James White's discussion What happened to Home Energy Pro's website?
"I stopped using Firefox -- too many glitches"
3 hours ago
Tom Mallard replied to Hal Skinner's discussion How our ceramic based RCC works in the group Radiant Control Coatings
"So it seems that what you're saying is for heat-transfer the stuff has little resistance or…"
12 hours ago
Mike Kandel posted a discussion

Earn BPI CEUs at 3rd Annual Building Performance Forum

If you're searching for BPI CEUs, you'll find plenty at the 3rd Annual Building Performance Forum…See More
18 hours ago
Mike Kandel added a discussion to the group Building Performance Institute (BPI)
Thumbnail

Earn BPI CEUs at 3rd Annual Building Performance Forum

If you're searching for BPI CEUs, you'll find plenty at the 3rd Annual Building Performance Forum…See More
18 hours ago
Sean Lintow Sr commented on Christopher Morin's blog post UPDATED: Big Changes for Duct Testing in MA
"4% TOTAL Ted - Leakage to outside was stripped from the codes & for good reason"
21 hours ago
tedkidd commented on Christopher Morin's blog post UPDATED: Big Changes for Duct Testing in MA
"Wait!  4% total leakage or 4% leakage to outdoors? "
22 hours ago
Tom White's video was featured

Alliant Energy's PowerHouse TV: Sealing Leaky Ductwork

The PowerHouse television shows are written and produced by Alliant Energy, an energy services company based in Madison, Wis. The first PowerHouse episode was aired in September 1996 on KCRG-TV9 in Cedar Rapids, Iowa, and appears in six broadcast…
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service