[Equest-users] Baseline Fan power calculation

[James Hansen]

If it was me, I'd just set the space temperature to 75 degrees, knowing
that the difference between that and 71.6 degrees probably won't make a
huge difference in the savings between baseline and proposed.

 

I thought I remember seeing something from Jeff Hirsch a while back that
showed how to de-activate this particular alarm so that the model would
run??

 

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: Hala Jaber [mailto:halajaber82 at gmail.com] 
Sent: Wednesday, January 22, 2014 4:30 PM
To: James Hansen; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Baseline Fan power calculation

 

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 <mailto: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 <mailto: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/> * <http://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 <mailto:halajaber82 at gmail.com> 

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