[Bldg-sim] eQUEST GSHP Unmet Load Hours

Robby Oylear robbyo at rushingco.com
Thu May 22 09:36:03 PDT 2008


I’ve never used an optimum start schedule before.  I tried inputting the
-999 flag in the schedule but without much luck.  It reduced the number of
load hours from around 1100 total to 800, but did not eliminate the
problem.  So far I’ve found that increasing max zone entering temperature
and increasing the supply cfm lowers the unmet load hours, but I’m afraid
of increasing the energy use unnecessarily.  I’ve got the same building
using a different system to meet all of its unmet load hours with similar
CFM and btu-h heating/sf.



Robby Oylear

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

 <http://www.rushingco.com> www.rushingco.com

  _____

From: Eric Yang [mailto:Eric.Yang at smithgroup.com]
Sent: Thursday, May 22, 2008 8:17 AM
To: Robby Oylear; bldg-sim at onebuilding.org
Subject: RE: [Bldg-sim] eQUEST GSHP Unmet Load Hours



Maybe you can input or modify optimum start schedule.



Eric Yang

Mechanical Engineer Group

LEED AP, C.E.M

























SmithGroup

1850 K Street NW, Suite 250

Washington, D.C. 20006

D  2 0 2 . 9 7 4 . 4 5 5 5

F  7 3 4 . 7 8 0 . 8 6 7 1

 <mailto:eric.yang at smithgroup.com> eric.yang at smithgroup.com

“ <http://www.bdcnetwork.com/article/CA6440632.html> One of the Best AEC
Firms to Work For”

Building Design + Construction Magazine, May 2007

See how we do it. /

 <http://www.smithgroup.com/> www.smithgroup.com



  _____

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Robby Oylear
Sent: Thursday, May 22, 2008 11:13 AM
To: bldg-sim at onebuilding.org
Subject: [Bldg-sim] eQUEST GSHP Unmet Load Hours



Hi everyone,



I’m trying to model a ground source heat pump system in eQUEST using a
Water Loop Heat Pump system attached to a ground source heat exchanger.
The system seems to work fine during occupied hour but it just can’t meet
morning warm-up loads.  I’m doing a systems energy analysis for our local
energy code compliance and there is a mandatory night setback of 55 °F
from 70 °F in heating.  During winter months the system doesn’t seem to be
able to jump from 55 °F to 70 °F space temperature in less than 1-2 hours.
I’ve double checked the fan schedules and the system is allowed to come on
during this time.



Does anyone have any suggestions for getting the system to meet these
unmet load hours?



Robby Oylear

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

 <http://www.rushingco.com> www.rushingco.com





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20080522/56cdb703/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1804 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20080522/56cdb703/attachment-0001.jpeg>


More information about the Bldg-sim mailing list