[Bldg-sim] EE4 - Heat Pumps

[Kyle Fridgen]

Sounds like you're using a fan coils with a make-up air unit.  The heating and cooling setpoints entered at the system level is for tempering the make-up air only.

The reason for the unmet hours is likely that your terminal airflow is not large enough.  The air will only be heated to a maximum supply temperature (43°C?) so you can't get the output unless terminal airflow is also increased.

Regards,
Kyle

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Katherine Louman-Gardiner
Sent: Thursday, January 06, 2011 12:10 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] EE4 - Heat Pumps

Hi,
Has anyone used EE4 before?  It's a Canadian compliance software program.
I've modeled a Combination Ground Source Heat Pump and Parallel boiler, but the program requires that "the heating airflow temperature must always be lower than the cooling airflow temperature."  Of course, with my heating setpoint at 60F, and my cooling at 65F, I've got hundreds of unmet hours.  I've put the zone heating capacities at unrealistically high values to try to make up the heat, but that's not working either.
Has anyone encountered this problem before, or know why this constraint is in place?
Thank you,
Katherine
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20110106/6c5ae529/attachment-0002.htm>