VAV System - high cooling energy in winter

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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
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
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prohibited. If you are not the intended recipient, please contact the
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MikeSSC's picture
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Joined: 2012-04-23
Reputation: 1

Hi I tried opening the file, it didn?t work for me. Thanks

Harshul Singhal
Project Consultant
Thornton Tomasetti
386 Fore Street, Suite 401
Portland, ME 04101
T 207.245.6060 F 207.245.6061
D 207.245.6074
HSinghal at ThorntonTomasetti.com
www.ThorntonTomasetti.com

harshul263's picture
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I?m using v3.65, did you try opening in 3.64?

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

Mobile: 609-923-1743
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:* Singhal, Harshul [mailto:HSinghal at ThorntonTomasetti.com]
*Sent:* Tuesday, July 08, 2014 3:39 PM
*To:* Michael Campbell; equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] VAV System - high cooling energy in winter

Hi I tried opening the file, it didn?t work for me. Thanks

*Harshul Singhal*
Project Consultant
Thornton Tomasetti
386 Fore Street, Suite 401
Portland, ME 04101
*T* 207.245.6060 *F* 207.245.6061
*D* 207.245.6074
HSinghal at ThorntonTomasetti.com
www.ThorntonTomasetti.com

*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
] *On Behalf Of *Michael
Campbell
*Sent:* Tuesday, July 08, 2014 2:58 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
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.*

MikeSSC's picture
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Joined: 2012-04-23
Reputation: 1

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:image003.png at 01CF9ABB.7D35BF70]

Travis Miller's picture
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Joined: 2011-09-30
Reputation: 0

Which version of eQuest, 3.64 or 3.65?
?
John R. Aulbach, PE?

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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John Aulbach's picture
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Joined: 2011-09-30
Reputation: 1

An aside: any PD2 file opened in notepad or similar text editors will clarify which version of eQuest was used to create it in the first few lines.

In this case, 3.65:
[cid:image001.png at 01CF9ACD.CF20CC00]

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

Nick-Caton's picture
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Joined: 2011-09-30
Reputation: 805

I?ve tried adjusting the schedules and that made little difference, the
building is still heating and cooling 8,760 hours per year. Also, I?ve
tried eliminating the plug loads and that also made no difference.

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

Mobile: 609-923-1743
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:* umesh atre [mailto:umeshatre at gmail.com]
*Sent:* Tuesday, July 08, 2014 6:37 PM
*To:* Michael Campbell
*Subject:* Re: [Equest-users] VAV System - high cooling energy in winter

Hi Mike,

Looks like you are using the same schedules for both heating and cooling,
and I would take a look at that.

Another item could be your heavy plug loads.

Cheers,

Umesh

MikeSSC's picture
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Joined: 2012-04-23
Reputation: 1

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
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
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.*

MikeSSC's picture
Offline
Joined: 2012-04-23
Reputation: 1

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

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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To unsubscribe from this mailing list send? a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG

John Aulbach's picture
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Joined: 2011-09-30
Reputation: 1

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

Mobile: 609-923-1743
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 <

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.*

_______________________________________________
Equest-users mailing list
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To unsubscribe from this mailing list send a blank message to
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MikeSSC's picture
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Joined: 2012-04-23
Reputation: 1

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

Keith Swartz's picture
Offline
Joined: 2011-09-30
Reputation: 0

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:

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
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 <

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.*

_______________________________________________
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

MikeSSC's picture
Offline
Joined: 2012-04-23
Reputation: 1

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

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 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.
?
?
_______________________________________________
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

John Aulbach's picture
Offline
Joined: 2011-09-30
Reputation: 1

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
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:* 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 <

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:

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 <

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
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*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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Maybe check the humidity controls. It is possible the dewpoint is set such that 51F is required to remove moisture from the air.

Footprint

Samuel Mason
Project Manager
d 647 943 0259

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