[Equest-users] OA Intake on Energy Use

[Victor Yeung]

Hi Brian,

 

Thanks for the quick reply.  I understand where you're coming from, but
100% free cooling was always available before I increased the OA intake.
The free cooling credit for both scenarios should be the same.  If the
building had no economizers, then yes, bringing in more OA will help
with the cooling.  There are definitely humid days where free cooling is
not available, and bringing in more OA on those days should increase the
overall cooling energy use.

 

VICTOR YEUNG, BASc, LEED(r) AP BD+C

victor at invirosystems.ca

 

 

From: Brian Fountain [mailto:bfountain at greensim.com] 
Sent: November-03-11 1:03 PM
To: Victor Yeung
Subject: Re: [Equest-users] OA Intake on Energy Use

 

I suspect (but don't know) that it is the difference between peak and
overall annual energy use.  Yes, by bringing in more OA the peak cooling
will go up (check SS-D) but there is more OA available for free cooling
so the overall cooling energy goes down.

On 11/3/2011 12:33 PM, Victor Yeung wrote: 

Hello modelling gurus,

 

I am modelling a restaurant space located in Canada serve by PSZ rooftop
units.  I notice something weird when I increase the OA intake for the
space.  Space heating energy use goes up as expected, but cooling energy
use went down a tad bit.  This doesn't make sense as I'm bringing in
more hot/humid OA to the space.  I've already setup dual enthalpy
economizers for the PSZ units, so I don't think it's a problem with free
cooling.

 

Anyone can point out what's going on?

 

Regards,

 

VICTOR YEUNG, BASc, LEED(r) AP BD+C

victor at invirosystems.ca

 

 

 






_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG






No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1834 / Virus Database: 2092/4593 - Release Date:
11/03/11

 

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1834 / Virus Database: 2092/4593 - Release Date:
11/03/11

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20111103/434609cd/attachment-0002.htm>