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: 353

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

Groups

Latest Activity

Safe-R Insulation commented on Chris Laumer-Giddens's blog post Rock Wool Insulation for Floor of High Performance Tiny House
"Thanks for sharing this much information about roof wall…"
8 hours ago
Lindsay Bachman's 4 events were featured
23 hours ago
Profile IconChris Hoskins and Ken Goodrich joined Home Energy Pros
yesterday
Diane Chojnowski commented on Diane Chojnowski's event Better Buildings Peer Exchange Call: Home Improvement Catalyst: Keeping the Ball Rolling with Homeowners by Delivering More Value
"Hi Victor, All the BBRN Peer Exchange Calls are archived so you can listen anytime. Check out over…"
yesterday
Victor Rols Lindsay commented on Diane Chojnowski's event Better Buildings Peer Exchange Call: Home Improvement Catalyst: Keeping the Ball Rolling with Homeowners by Delivering More Value
"Hi Diane, Unfortunately some of us are unable to partake in this webinar/ forum. Is there a…"
yesterday
Ken Summers replied to Gregory Cisco's discussion Abandoning under-slab HVAC ductwork which fills with groundwater seasonally.
"My largest concern is moisture. I have seen mold forming on interior walls in the heating season…"
yesterday
Seth Romme replied to Sonja Persram's discussion Energy Savings Guarantee for single family dwellings in cold climate??
"Hi Sonja We provide home energy optimization services and provide a 5-year heating and cooling…"
yesterday
Lindsay Bachman posted events
Thursday

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service