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

[Steve Mignogna]

James-

To size the baseboards I usually look at the corresponding space and size
based on the heat loss due to glass conduction.  It can be tedious but
eQuest has issues sizing them correctly.

steve

On Thu, Aug 21, 2008 at 12:07 PM, Bishop, Bill <
bbishop at pathfinderengineers.com> wrote:

>  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
> baseboards.
>
>
>
> Regards,
>
> Bill
>
>
>
> *William Bishop**, EIT, LEED(R) AP** **|** **Pathfinder Engineers LLP*
>
> Mechanical Engineer
>
>
>
> 3300 Monroe Ave., Suite 306
> Rochester, NY  14618
>
> TEL (585) 218-0730 Ext. 114
> FAX (585) 218-0737
>
> bbishop at pathfinderengineers.com
>
>
>
> www.pathfinderengineers.com
>
> P Please consider the environment before printing this email
>   ------------------------------
>
> *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 11:41 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
>   ------------------------------
>
> *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
>
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>
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>
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>
> www.ghtltd.com
>
>
>
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-- 
Steve Mignogna
Atelier Ten
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