[Bldg-sim] Baseboard heaters in VAV system

[Robby Oylear]

I was under the impression that eQUEST either doesn't size baseboards
correctly or at all.  The few times I've had to use baseboards I have had
to solve the underheated hours by manually sizing the baseboard heaters at
the zone level.  It's a pretty tedious process.

 

Robby Oylear

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

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

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andrew Craig
Sent: Thursday, August 21, 2008 8:41 AM
To: James Hansen; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Baseboard heaters in VAV system

 

James---

 

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.

 

Regards,

 

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

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James Hansen
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 correctly.

 

Thanks in advance!

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Direct)

703-243-1200 (Office)

703-276-1376 (Fax)

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

 


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