[Bldg-sim] Ventilation rate baseline in a major renovation

[Patrick J. O'Leary, Jr.]

if you're using dcv in the proposed model the ventilation rates are 
allowed to be different if the dcv use is not required by section 
6.4.3.8, but if you're not using dcv the oa rates are to be the same.  
reference exception in g3.1.2.5.



On 4/18/13 8:09 AM, Anne C. Juran wrote:
>
> My experience has been that the ventilation rates do have to match 
> between models when it comes to LEED.
>
> The rule is a bit short-sighted because, in reality, there are 
> potentials for energy savings from reduced OA just based on system 
> type. For example, a DOAS will have lower total OA than a typical VAV 
> system. My initial submission of a project using this argument was 
> rejected, though, because the OA values did not match between the two 
> models.
>
> *From:*bldg-sim-bounces at lists.onebuilding.org 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Jason 
> Kirchhoff
> *Sent:* Wednesday, April 17, 2013 7:13 PM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Ventilation rate baseline in a major renovation
>
> I'm working on a project that involves an expansion and a major 
> renovation of an existing building. My question relates to LEED 
> modeling of the existing building under LEED-NC.
>
> The issue is that the existing building is significantly 
> over-ventilated. My team is involved in an energy retrofit of the 
> existing structure and intends to bring the OA rate down 
> significantly. However because of the equal vent rate requirement in 
> Appendix-G, it seems like this won't lead to any energy credit. As I 
> understand it, no matter what we drop the vent rate to (or even if we 
> raised it), the proposed building will have to match and the 
> ventilation improvement will go unrecognized.
>
> In case that's not clear, say the current building has 10,000 cfm of 
> OA, but we're going to drop that to 5,000 cfm with the new design.  
> This leads to significant heating and cooling savings. Can the 
> baseline have 10,000 cfm because it's an existing building, or must it 
> match under all circumstances?
>
> Thanks,
>
> *Jason Kirchhoff*
>
> Technical Director
>
> Energize Analytics
>
> www.energizeanalytics.com <http://www.energizeanalytics.com>
>
>
>
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