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

[John Aulbach]

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://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://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] 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://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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