[Equest-users] HEAT-EIR-FT for heat pumps with water cooled condensers?

[Bishop, Bill]

Brian,
I agree that the DOE2 documentation is not very clear on your question. I believe Aaron is correct. Water-source heat pumps use EDB/EWT for HEAT-EIR-FT and EWB/EWT for cooling. In the DOE2.2 Dictionary entry that Aaron attached, the suffix of the GSHP/WLHP heating curve names is "fEwb&Ewt", which implies wet bulb temperature is used but I believe this to be in error. I looked at this when I created my own performance curves. I looked at hourly reports for temperature, humidity, temperature correction to power and power, compared these to the predicted output using the default GSHP/WLHP curves and determined that wet bulb temperature is used in cooling and dry bulb temperature is used in heating. Plus, it wouldn't make sense to use wet bulb temperature for the heating curves because no latent energy is added or removed during the heating process.
Regards,
Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
 134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 698-1956                        F: (585) 325-6005
bbishop at pathfinder-ea.com             www.pathfinder-ea.com

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aaron Smith
Sent: Sunday, April 13, 2014 6:30 PM
To: Brian Fountain; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] HEAT-EIR-FT for heat pumps with water cooled condensers?

Brian,

It looks to be EDB and EWT for heating (and EWB and EWT for cooling), refer to the attached from the DOE2.2 Dictionary.

Regards,
Aaron

Aaron Smith, P.Eng
M&R Engineering Ltd.

Sent from my BlackBerry 10 smartphone on the TELUS network.
  Original Message
From: Brian Fountain
Sent: Sunday, April 13, 2014 16:21
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] HEAT-EIR-FT for heat pumps with water cooled	condensers?

I am modelling a building with distributed water loop heat pumps. I am looking at the electricity used for space heating (the compressor energy in heating mode). This depends on a part load curve HEAT-EIR-FT which is a function of two temperatures. Based on the DOE2 documentation, it is not clear to me which two temperatures this curve is using to modify the compressor energy for a water-cooled heat pump. 



For an air-cooled heat pump, the curve is a function of entering dry-bulb temperature and outdoor dry-bulb temperature. I want to know what the X and Y values are for a water-cooled heat pump.



Can anyone provide any clarification on this?



Many thanks.



Brian