[Equest-users] Excessive Unmet Heating Load Hours with an Auto-Sized HVAC System

[Pasha Korber-Gonzalez]

Peter--I can help you with this, you're on the right track, but Yes-being
Friday I too am feeling lazy for the weekend, not wanting to type you a
whole page of info.  Give me a call and I'll talk you through it.  I'm
available now.


308-763-1593.
Pasha

On Fri, Jun 11, 2010 at 8:47 AM, Peter Hillermann <
e190984026 at exchange.1and1.com> wrote:

>  Pasha,
>
>
>
> Can I use a baseboard as radiant tube heat from the ceiling (gas hookup
> with Flue)? My thought is it’s a computer how does it know whether the heat
> is coming from the ceiling or the floor as long as its heating the
> perimeter. Would I be correct or should I just go sit in the corner now and
> be quiet?
>
>
>
> PS: I’m too lazy to draw perimeter zones just for a radiant heater and its
> Friday. (Just joking)
>
>
>
> Thanks,
>
>
>
> *PETER HILLERMANN*
>
>
>
> peterh at westallarchitects.com
>
>
>
> *westall*
>
> *architects*
>
> 3404 pierce drive
>
> chamblee, georgia 30341
>
>
>
> o 770.458.4113
>
> f  770.458.5352
>
> c 678.898.2936
>
>
>
> westallarchitects.com
>
> [image: e-signature][image: USGBC-Logo]
>
>
>
>
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Pasha
> Korber-Gonzalez
> *Sent:* Thursday, June 10, 2010 10:55 PM
> *To:* Robert Des Rosiers
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Excessive Unmet Heating Load Hours with an
> Auto-Sized HVAC System
>
>
>
> I have found with my own projects that even sometimes when the HVAC
> designer has specified a specific capacity for htg water equipment that
> sometime in my model file I still have unmet loads for htg.  I suggest at
> this point specify additional htg capacity by either increasing the reheat
> delta-T from say 30F to 50F and/or adding zone level baseboards.  By adding
> the baseboards you are adding a component of the system that will supplement
> the skin losses being experienced by the simulation model.
>
>
>
> by adding baseboards for the additional requrired heat then you should be
> able to meet your heating loads.
>
>
>
> hope this helps,
>
> pasha
>
> On Thu, Jun 10, 2010 at 7:38 PM, Robert Des Rosiers <
> desrosiers at studioma.com> wrote:
>
> All:
>
> I have completed an energy model for a baseline scenario from which to
> compare my proposed design.  The baseline HVAC system is a constant volume
> single zone AHU w/ no reheat; the AHU is served by HW and CHW loop from a
> central plant.  I have set this up in eQuest as a "Variable Air Volume"
> system type with the AHU fan control set to "Constant Volume"; my thought
> here is that each zone fed by the AHU will control temperature using a VAV
> box w/ no local reheat or cooling.  Flow and temperature from the AHU will
> be delivered based on the coolest or warmest zone it serves.
>
>
>
> All seems fine with the design flows, ventilation flows and cooling
> capacities.  My problem is with the heating capacity as I have excessive
> unmet heating hours (50,000).  I have allowed eQuest to size the heating
> capacity of the preheat and heating coil as well as the minimum flow
> ratios.  *Does anyone have any thoughts as to what is causing these unmet
> heating load hours?  Is the way I have set-up the desired baseline HVAC
> system incorrect?*
>
>
>
> Any guidance is greatly appreciated.  Thanks -
>
>
>
> Robert Des Rosiers, LEED-AP
>
> *STUDIO MA*
>
> 130 N Central Avenue, No.300 Phoenix, Arizona 85004
>
> Telephone 602 251 3800
>
> Fax 602 251 3100
>
>
>
>
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