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: 296

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

Tom White's blog post was featured

Embodied Energy: Minimizing Waste with Off-Site Construction

Matthew Wadlund is adding infill housing stock to the Oceanview neighborhood of Berkeley,…See More
19 minutes ago
Home Energy Magazine's blog post was featured
20 minutes ago
Profile IconRavi Malhotra, Andrew Schnizel, Tyrone Fagin and 4 more joined Home Energy Pros
25 minutes ago
Jason Szumlanski posted a blog post
5 hours ago
Andrew Schnizel posted a blog post

Energy shortage and HVAC business in Canada!!

Being a country of highest life expectancy, how much self reliant is Canada in power sector??? HVAC…See More
6 hours ago
Jennifer Stutzman commented on James P. Weingardt's photo
Thumbnail

Can anyone see what is going on here?

"Was there any dampness? Did the cable guy drill a hole all the way through the exterior wall…"
6 hours ago
Jennifer Stutzman commented on Michael Dunseith's photo
Thumbnail

WT*

"Beer can radiator?"
7 hours ago
Scott Stubbs added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Retrotec Commercial & Residential Blower Doors $4800

My business no longer has the need for my Retrotec blower door equipment so I am selling both the…See More
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service