[Equest-users] VAV System - high cooling energy in winter

[Michael Campbell]

I have the cooling temp set to 55, but for some reason it is cooling down
to 51



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

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*From:* John Aulbach [mailto:jra_sac at yahoo.com]
*Sent:* Friday, July 11, 2014 1:12 PM
*To:* Michael Campbell; Travis Miller; equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] VAV System - high cooling energy in winter



Looks like a classic reheating operation to me. Air hits cooling coil first
(51 F), then reheated to 58. Why are you not allowing the cooling coil temp
to back off?



John R. Aulbach, PE



On Friday, July 11, 2014 7:10 AM, Michael Campbell <
mike at sustainablesolutionscorporation.com> wrote:



I ran a report to look at the supply air temps from the AHU’s and here is
what I have in the first hour of the year:





>From this, it looks like the air is being cooled down to 51F then heated
back up to 59F.  Anyone have any ideas as to why this might be happening?
I can’t seem to figure this out.



Thanks,



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
http://www.sustainablesolutionscorporation.com/
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*



*From:* John Aulbach [mailto:jra_sac at yahoo.com]
*Sent:* Wednesday, July 09, 2014 2:48 PM
*To:* Michael Campbell; Travis Miller; equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] VAV System - high cooling energy in winter



Have you tried resetting chilled and hot water temperatures? Also, how much
of your load is outside air?



John R. Aulbach, PE



On Wednesday, July 9, 2014 5:09 AM, Michael Campbell <
mike at sustainablesolutionscorporation.com> wrote:



It looks like this did the trick – thank you!



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
http://www.sustainablesolutionscorporation.com/
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*



*From:* Travis Miller [mailto:tmiller at dcengineering.net]
*Sent:* Tuesday, July 08, 2014 4:47 PM
*To:* Michael Campbell; equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] VAV System - high cooling energy in winter



You have the cooling control set at constant – do you know if the existing
building has a sequence of operation to follow?



For a recent  new building which had a VAV air handler with a chilled water
coil (water delivered from an aquifer in this case, VFD drives, etc.) I
used the below parameters, which appear to have a large effect on your
model.



Travis









*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
<equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Michael
Campbell
*Sent:* Tuesday, July 08, 2014 12:58 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] VAV System - high cooling energy in winter



Hi,



I’m trying to model an existing building with a chilled water VAV system.
The chilled water usage is much higher in the winter time than expected.
Is this a common issue?  Does anyone have any suggestions for fixing this?
My files are attached.



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
http://www.sustainablesolutionscorporation.com/
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*





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