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: 299

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.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Manuel Macias Munoz commented on Chris Dorsi's blog post Habitat X Releases 2015 Position Statement
"After several years of experimentation and testing, achieve to create a system constructive new, to…"
9 hours ago
Theresa L Gilbride's blog post was featured

Find out whose building some of the best-performing homes in the country today with DOE’s Tour of Zero

Home buyers across the country can find out where the home of the future is available today with…See More
10 hours ago
Profile IconMichael Laurie, Randall Herlihy, Matt Risinger and 1 more joined Home Energy Pros
13 hours ago
Quinn Korzeniecki added a discussion to the group Building Performance Institute (BPI)
Thumbnail

Obama Announced New Actions to Bring Energy Efficiency to Households across the Country

Big news out of The White House last week for the ‪‎clean energy‬ housing sector: HUD and DOE have…See More
14 hours ago
Theresa L Gilbride posted a blog post

Find out whose building some of the best-performing homes in the country today with DOE’s Tour of Zero

Home buyers across the country can find out where the home of the future is available today with…See More
14 hours ago
Colin Genge commented on Chris Laumer-Giddens's blog post Building Science is Worthless...
"We has passive house tester complaining the Aluminum Frame leaked too much so we measured them at…"
16 hours ago
Michael Dunseith posted a photo
17 hours ago
Michael Dunseith replied to Kim Tanner's discussion Fantastic innovation
"It was designed for air handlers to determine the total system air flow. I It would be installed in…"
17 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service