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: 266

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

Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Title 24 requires whole house fans in zones 8-14 in the prescriptive path only. With many…"
15 minutes ago
Jenn Saunders replied to Jenn Saunders's discussion iEnergyApp: Quickly generate professional reports for homeowners and get more contracts!
"Hey Tom, You are most welcome.  iEnergyApp is not free, but it is reasonable and pays for…"
28 minutes ago
Jenn Saunders posted a photo

Automatically Generate Clean Simple Reports for Homeowners

Stop spending hours cropping and resizing images, formatting and reformatting a Word document to…
35 minutes ago
Eric Sperline added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Beware ebay seller "supermomofps"

I bought a blower door system on Ebay from "supermomofps"  The item was never sent and…See More
1 hour ago
Larry Nissman replied to John Shillito's discussion Fixing a water heater?
"I have to agree with Kurt. 2000 ppm is exceedingly high. I have tested hundreds of hot water heater…"
1 hour ago
Tom White's video was featured

Passive House Revolution - Film Trailer

Looking for energy-efficiency in buildings? There's no need to wait for new technology - Passive House buildings use 80-90% less heating and cooling energy.
1 hour ago
Diane Chojnowski joined Hal Skinner's group
Thumbnail

Radiant Control Coatings

A group where people who work with radiant barrier coatings can let others know all of their uses.See More
1 hour ago
Richard Beyer replied to Shawna Henderson's discussion High Density Foam -- Any Incidents of Cracking in Frame Walls as Studs Dry/Twist?
"Shawna foam pulling away from the studs due to over application will cause spontaneous…"
2 hours ago
Hal Skinner posted a group
Thumbnail

Radiant Control Coatings and their many uses.

A group where people who work with radiant barrier coatings can let others know all of their uses.See More
2 hours ago
Profile IconAlex Burnham and Annika Brink joined Home Energy Pros
2 hours ago
Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Reading the Invisco description you will find that it is designed to be surrounded by cellulose to…"
yesterday
Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, I think cost of operation is always a factor but I am not sure I would leave it just cfm.…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service