[Equest-users] Baseline Fan power calculation

Hala Jaber halajaber82 at gmail.com
Wed Jan 22 13:30:18 PST 2014


Dear James, thank you, but i have already set the warmest rest temp as
required by section G3.1.3.12 supply air temerature reset, but still  i
have the problem in the 20 degree difference between the 71.6 and the
cooling coil supply temp.
I hope if this clarify more my question.

Hala Jaber.

Sustainable Design Engineer.; LEED AP BD +C .

+962-79-7570197

email: halajaber82 at gmail.com
On Wed, Jan 22, 2014 at 11:57 PM, James Hansen <JHANSEN at ghtltd.com> wrote:

> System 8 has a main AHU that feeds parallel fan powered VAV boxes.  For
> your main AHU, you need to make sure your cooling reset temperature for
> supply air (LAT) is set to "warmest".
>
>
>
> GHT Limited
>
> *James Hansen, PE, LEED AP, BEMP*
>
> *Senior Associate*
>
> *1110 N. Glebe Road, Suite 300*
>
> *Arlington, VA 22201*
>
> *703.243.1200 (main)*
>
> *703.338.5754 (direct/cell)*
>
> *www.ghtltd.com* <http://www.ghtltd.com>
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Hala Jaber
> *Sent:* Wednesday, January 22, 2014 3:56 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Baseline Fan power calculation
>
>
>
> Thanks James,but what do you mean by LAT, in addition to the fact that i
> have modeled the chilled water supply temperature reset as per the
> requirement the rest based on outdoor dry bulb temp using :44 F at 80 f and
> above,  54 f at 60 f and below, so how can i compromise this since the
> actual thermostat cooling set point is 71.6, and i don't have AHU in
> baseline,  its system 8.
> Thanks alot
>
>
>
> --
>
> Hala Jaber.
>
> Sustainable Design Engineer.; LEED AP BD +C .
>
> +962-79-7570197
>
> email: halajaber82 at gmail.com
>
>
>
> On Jan 22, 2014 8:24 PM, "James Hansen" <JHANSEN at ghtltd.com> wrote:
>
> > If your CHW supply temp is 44F, and your LAT setpoint for the AHU is
> 51.6,
> > then you are 6F higher.  Check your reset schedules - if you allow reset
> > for CHW without also allowing reset for the AHU (both per ASHRAE), you
> may
> > have a condition where the CHW supply is within 6 degrees of your LAT.
> >
> >
> >
> > GHT Limited
> >
>
> > *James Hansen, PE, LEED AP, BEMP*
> >
> > *Senior Associate*
> >
> > *1110 N. Glebe Road, Suite 300*
> >
> > *Arlington, VA 22201*
> >
> > * 703.243.1200 (main)*
> >
> > * 703.338.5754 (direct/cell)*
> >
> > *www.ghtltd.com* <http://www.ghtltd.com>
>
>
>
> > Hey eQuest users,
> > I have a new challanging  requirement in the appendix G section G3.1.2.8,
> > its required the supply air-to room air cooling temperature difference is
> > 20 degrees for each HVAC system. Now my question is how can i achieve
> this
> > if my baseline is system 8 and the chilled water leaving temperature is
> > specified 44 F with return delta t=12,at the same time that in my design
> > the indoor thermostat temp=71.6 F , and the supply cooling temp should be
> > 51.6F,  here when i set this value i got an error in eQuest stating that"
> > the cooling coil leaving temperatures must be at least 6 F higher than
> > entering water temp" and when i set the cooling supply air temp
>
>
>
>
>



-- 

Hala Jaber.

Sustainable Design Engineer.; LEED AP BD +C .

+962-79-7570197

email: halajaber82 at gmail.com
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