[Equest-users] App G model VAV w unmet loads in heating

[Bishop, Bill]

Matthew,

You have many extraneous exterior surfaces - roofs, underground floors, and exterior walls.

[cid:image002.jpg at 01CE8D19.FCCF83C0]

[cid:image003.jpg at 01CE8D19.FCCF83C0]

[cid:image004.jpg at 01CE8D19.FCCF83C0]

Some other issues that may or may not be contributing to your undermet heating hours:

-          #/occupants seems high

-          You are oversizing your boilers by 25%. If this is for LEED/Appendix G, oversize the systems only and use 0.50 capacity ratio for the two boilers.

-          System sizing-ratio should be "1.00" for Appendix G baseline. If you keep it at "1.15", change the cooling sizing ratio to "1.00" and heating sizing ratio to "1.087".

-          Night cycle control is set to "Stay off". This should be "Cycle on Any" for an Appendix G baseline.

Regards,
Bill


William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114            F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>           www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
P   Sustainability - the forest AND the trees. P

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of R B
Sent: Tuesday, July 30, 2013 11:40 AM
To: Matthew Baron; eQUEST Users List
Subject: Re: [Equest-users] App G model VAV w unmet loads in heating

I looked at your file. When I get these types of unmet errors, the first thing I do is set the max flow for heating (under the fan flow parameters) to 1 or whatever ratio is allowed - I think the eQuest default is 0.5, which probably is too less for cold climates. If this does not help, I normally look at the min flow (reducing it if possible helps). Other is to look at the zone design cfm - usually reducing it helps - but reducing it too much results in cooling hours unmet. For LEED I try to get each zone unmet below 50 -so start with the highest unmet zone. Sometimes I end up with a combination of all the above.
Hope this helps.
-Rohini

On Tue, Jul 30, 2013 at 8:31 AM, Matthew Baron <mbaron at wendelcompanies.com<mailto:mbaron at wendelcompanies.com>> wrote:
Yes I have a zone heat source set to my hot water loop and a 50 degree delta for the reheat coil.

Thanks,
Matthew J. Baron
[wendel EM]

Wendel, 140 John James Audubon Pkwy, Suite 201, Buffalo, NY 14228
p 716.688.0766<tel:716.688.0766>   f 716.625.6825<tel:716.625.6825>   e mbaron at wendelcompanies. com   w wendelcompanies. com

ARCHITECTURE    ENGINEERING    PLANNING    ENERGY SERVICES    CONSTRUCTION MANAGEMENT

CONFIDENTIALITY NOTICE: This email transmission is confidential and is intended only for the person(s) named above. Its contents may also be protected by privilege, and all rights to privilege are expressly claimed and not waived.  If you have received this email in error, please call us immediately and destroy the entire email. If this email is not intended for you, any reading, distribution, copying or disclosure of this email is strictly prohibited.

Please consider the environment before printing this email.

From: R B [mailto:slv3sat at gmail.com<mailto:slv3sat at gmail.com>]
Sent: Tuesday, July 30, 2013 9:16 AM
To: Matthew Baron
Subject: Re: [Equest-users] App G model VAV w unmet loads in heating

Do you have a reheat delta t and zone heating coils installed (both in the system tab). Sorry, havn't looked at your files.
-Rohini

On Tue, Jul 30, 2013 at 8:03 AM, Matthew Baron <mbaron at wendelcompanies.com<mailto:mbaron at wendelcompanies.com>> wrote:
HI,
I am working on several school models and they generally fall into the packaged vav with reheat category. The spaces are fine for cooling, but are way off for heating. When I look at the ss-p report the heating capacity for the units shown to be zero, when I look at the ss-a report it indicates the heating load. I have entered the hot deck temp, zone entering temp, a preheat coil. Any suggestions would be appreciated.

Thanks,
Matthew J. Baron


Wendel, 140 John James Audubon Pkwy, Suite 201, Buffalo, NY 14228
p 716.688.0766<tel:716.688.0766>   f 716.625.6825<tel:716.625.6825>   e mbaron at wendelcompanies. com   w wendelcompanies. com

ARCHITECTURE    ENGINEERING    PLANNING    ENERGY SERVICES    CONSTRUCTION MANAGEMENT

CONFIDENTIALITY NOTICE: This email transmission is confidential and is intended only for the person(s) named above. Its contents may also be protected by privilege, and all rights to privilege are expressly claimed and not waived.  If you have received this email in error, please call us immediately and destroy the entire email. If this email is not intended for you, any reading, distribution, copying or disclosure of this email is strictly prohibited.

Please consider the environment before printing this email.


_______________________________________________
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/20130730/17495c3a/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 18440 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130730/17495c3a/attachment-0006.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 18563 bytes
Desc: image003.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130730/17495c3a/attachment-0007.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 24513 bytes
Desc: image004.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130730/17495c3a/attachment-0008.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 3940 bytes
Desc: image005.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130730/17495c3a/attachment-0002.png>