[Equest-users] 90.1 Baseline HVAC System 7 - VAV w Reheat andBaseboard

[Michael Mantai]

We just got a review comment from GBCI stating to verify that we set our
outside air to be shut off during night cycling in the baseline.  So at
least one reviewer interprets that requirement.  We¹ve always done it that
way, but a lot of packaged equipment out there doesn¹t actually have that
capability.


On 10/28/10 10:57 AM, "Bishop, Bill" <wbishop at pathfinder-ea.com> wrote:

> Jonathan,
>  
> ASHRAE Standard 90.1-2007, Appendix G. section G3.1.2.4 requires fan cycling
> to meet heating and cooling loads during unoccupied hours. Appendix G. does
> not provide guidance on the use of baseboard heating. My approach has been to
> always leave baseboards out of the baseline building design.
>  
> There is a discussion on the Bldg-Sim list today about ventilation rates per
> G3.1.2.5. There seem to be as many interpretations of this section as there
> are energy modelers. In the case of a proposed fan system that shuts off at
> night, I would model the baseline with a MIN-AIR-SCH, set to 0 during
> unoccupied hours, so that no ventilation is provided during nighttime fan
> cycling.
>  
> Regards,
> Bill
>  
> 
> William Bishop, PE, BEMP, LEED® AP | Pathfinder Engineers & Architects LLP
> Mechanical Engineer
>  
> 134 South Fitzhugh Street
>  Rochester, NY 14608
> T: (585) 325-6004 Ext. 114
> F: (585) 325-6005
> 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 Jonathan
> Smith
> Sent: Thursday, October 28, 2010 10:28 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] 90.1 Baseline HVAC System 7 - VAV w Reheat
> andBaseboard
>  
> eQuesters: 
>  
> To comply with 90.1-2007 System Type 7, do I need to have supplemental heat
> with baseboards if I have it in the proposed system? Or, is it allowable to
> meet nighttime heating demands by cycling fans during unoccupied hours to meet
> nighttime setback temperature?
>  
> In the proposed model during unoccupied periods I have fans OFF with
> baseboards providing supplemental heat.
>  
> Thanks in advance for your feedback.
>  
> Jonathan R. Smith AIA LEED®AP
>  
> 
> 
> 40 Beaver Street
> Albany, New York 12207
> p: 518.463.8068 x268
> f: 518.463.8069 
> www.csarchpc.com <http://www.csarchpc.com/>
>  
> 
> 
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