[Equest-users] Heating Hours Unmet

Bishop, Bill wbishop at pathfinder-ea.com
Mon Sep 14 04:54:10 PDT 2009

Like Jeremy says, if you are modeling System 3 in Appendix G then you
should have one system per zone (as described in the 90.1 User's Manual,
p.G-23). One thing to check for unmet heating hours is your zone
BASEBOARD-CTRL (assuming you have perimeter heating). Set it to
Thermostatic. If you try to satisfy multiple zones with one single zone
system, try changing the control zone, manually adjusting the supply
flow to individual zones, and/or setting interior walls to "Air" walls
where appropriate (such as for zones where air is supplied to one and
returned from the adjacent zone).
William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
P Please strive to live sustainably.

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jeremy
Sent: Monday, September 14, 2009 12:43 AM
To: Nisonger, Kyle M NWK; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Heating Hours Unmet
Try this first: eQuest expects a single-zone system to serve just that -
a single zone.  You'll need to have a separate single zone system
created for each zone you need to assign to that system.  Once that is
done, eQuest will then be able to address the thermostats in each zone
adequately and you should see a rather dramatic drop in your unmet
heating hours, possibly eliminating them altogether.
After that, if unmet heating hours remain there are a number of other
things to look at.  Let us know if the above works first.
Senior Sustainability Analyst
Strategic Services
Site Solutions | Operations | Sustainability


Epstein is a firm believer in sustainability. We ask that you please
consider the environment before printing this e-mail.

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Nisonger, Kyle M NWK
Sent: Friday, September 11, 2009 4:11 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heating Hours Unmet
I have a packaged single zone system using DX cooling and Furnace
heating that serves 7 different zones and is controlled by the corridor
zone.  This is supposed to replicate "System 3" in ASHRAE 90.1 appendix
G.  I have many unmet heating hours (including my system control zone).
I have let eQuest auto size equipment capacities and and cfm. I have
tried doing everything I can think of to reduce the number of unmet
hours.  My OA volumes are pretty small and shouldn't be affecting it.  I
expected possibly a few unmet hours in some of the zones, but not in my
control zone, the corridor, and not to this magnitude.   I get the
following warning message seen below, I'm not sure what it means by
"Baseboard-Rating"?  Any ideas on what this means or how I could reduce
the number of unmet heating hours?
             ZONE EL1 Food Storage Zn (G.S2)      
             might have insufficient heating capability. 
             Check that the SYSTEM or ZONE HEATING-CAPACITY plus this 
             ZONEs BASEBOARD-RATING is adequate to maintain the ZONE 
             specified DESIGN-HEAT-T for the calculated peak ZONE load 
             (see LS-A or LS-B for the ZONE peak load.) 
Thanks for your help, 
Kyle Nisonger 
Mechanical Engineer, LEED(r) AP 
US Army Corps of Engineers 
Kansas City District 
(816) 389-3224 
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