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

[Keith Swartz]

Mike,

I can’t open your file because I uninstalled 3-65, but I suggest you check the economizer low limit. A common cause I have encountered for winter cooling is due to the economizer low limit. The common default is for the economizer to shut off when the temperature drops below 45F (which is pretty ridiculous in my opinion), so the model turns on a compressor to do any cooling when it’s colder than 45F outside (which is most of the winter here in Wisconsin!). To remove the low limit, right-click on the number in the field (the red “45”) and select “Restore Default.” The field will then be blank—no low limit. Even though the text is red, it is not a user-entered value.

Keith Swartz, PE, BEMP, LEED AP
Senior Energy Engineer | Energy Center of Wisconsin | Madison.Chicago.Minneapolis
608.210.7123 | www.ecw.org<http://www.ecw.org/>

From: Michael Campbell [mailto:mike at sustainablesolutionscorporation.com]
Sent: Wednesday, July 09, 2014 1:58 PM
To: John Aulbach; Travis Miller; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] VAV System - high cooling energy in winter

I have not tried using reset schedules for chilled or hot water temps because the existing building does not use reset schedules.  Where can I find the loads due to OA?

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

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<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<mailto: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<mailto: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<http://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<mailto:tmiller at dcengineering.net>]
Sent: Tuesday, July 08, 2014 4:47 PM
To: Michael Campbell; equest-users at lists.onebuilding.org<mailto: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

[cid:image001.png at 01CF9C67.A711CD40]



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<mailto: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<http://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.


_______________________________________________
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<mailto:EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20140710/26f8b01d/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 171577 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20140710/26f8b01d/attachment.png>