[Equest-users] [Bldg-sim] Baseboard heaters in VAV system

Bishop, Bill bbishop at PathfinderEngineers.com
Thu Aug 21 09:07:52 PDT 2008

I agree with James, except I believe if you have a Hot Water Loop
selected for your Zone Heat Source at the system level, you are modeling
reheat at the VAV boxes.  I would select "Not Installed" for the Zone
Heat Source.  Check the SV-A report for the system and you should have
"BASEBOARDS" show up next to a heating capacity value for the zones with





William Bishop, EIT, LEED(r) AP | Pathfinder Engineers LLP

Mechanical Engineer


3300 Monroe Ave., Suite 306 
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TEL (585) 218-0730 Ext. 114
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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andrew
Sent: Thursday, August 21, 2008 11:41 AM
To: James Hansen; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Baseboard heaters in VAV system




In my opinion, baseboards act a little funny in eQUEST.  This is how
I've made the scenario you describe work:  


Under the Heating tab of your unit (Coil Cap/Control), restore the
default in the reheat entry so it is blank.  Make sure the Hot Water
Loop is still enabled as the zone heating source though.  Under the
Preheat/Baseboard tab, specify Baseboard Source as the Hot Water Loop.
You can change the default entries for the baseboards (pressure drop,
delta T, valve, etc.)  if applicable.  Then for each perimeter zone, go
into the heating tab and change the Baseboard control to Thermostatic if
it isn't already selected.  I've had trouble getting the Outdoor Reset
selection to work and most of our projects have baseboards controlled by
thermostats anyway.  You can also enter the capacity of the baseboards
for each zone or let the system self-size.  This should work...if not
I'd be happy to look at the inp.




Andrew Craig, EIT,LEED AP/ Mechanical Designer 
direct 503.382.2696 


From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James
Sent: Thursday, August 21, 2008 8:18 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Baseboard heaters in VAV system


I've got a building that cools with shutoff VAV boxes and heats with
perimeter hydronic baseboard heaters.


When I'm setting up my system, do I specify hot water baseboard heaters
and leave the Zone Heat Source set to "Not Installed", or do I specify a
hot water loop for the Zone Heat Source, and eQuest knows to apply this
to the baseboard heaters and NOT the shutoff VAV boxes?


I currently have the Zone Heat Source as "Not Installed", but it appears
from my SS-R reports that there are hundreds of hours of underheating,
so something is not working correctly.  I've had my hot water loop set
to snap, demand, and scheduled, so I think the loop is running


Thanks in advance!


GHT Limited
James Hansen, PE, LEED AP

Senior Associate

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Arlington, VA  22201-4749

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