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

R B slv3sat at gmail.com
Tue Jul 30 08:46:40 PDT 2013
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I recollect that setting 1.15 at the main tab increases the cfm also, so
you might want to leave it at 1 and make changes at the cooling/heating tab.
-Rohini


On Tue, Jul 30, 2013 at 10:43 AM, Bishop, Bill <bbishop at pathfinder-ea.com>wrote:

>  Matthew,****
>
> ** **
>
> You have many extraneous exterior surfaces – roofs, underground floors,
> and exterior walls.****
>
> ** **
>
> ****
>
> ** **
>
> ****
>
> ** **
>
> ****
>
> ** **
>
> 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 <wbishop at pathfinder-ea.com>
> 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>
> 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****
>
> [image: wendel EM]
>
> Wendel, 140 John James Audubon Pkwy, Suite 201, Buffalo, NY 14228
> *p* 716.688.0766   *f* 716.625.6825   *e* mbaron at wendelcompanies. com   *w
> ** *wendelcompanies. com
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>  ****
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> *From:* R B [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>
> 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   *f* 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
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