I'm not really sure how the envelope should be input in baseline vs. proposed. Here is the reviewer comment "The LEED Summary report indicates that a single wall construction was modeled in both the Proposed and Baseline cases. However, this is unexpected in renovation projects. Additionally, it is unclear what constructions are renovated, which are existing non renovated constructions, and which are new constructions. Further, it is unclear whether the existing envelope conditions prior to retrofit were modeled consistent with the requirements of ASHRAE 90.1-2007 Table G3.1.5(Baseline)(f). For all envelope assemblies located in spaces that were conditioned prior to retrofit, model the Baseline Case envelope U-factors, SHGCs, and F-factors using the existing conditions prior to retrofit. Additionally, clearly identify all existing renovated, existing non-renovated, and new constructions, revise the Proposed building appropriately, provide the revised LEED Summary, Library Members, and Space Entered Values reports from TRACE, and update the form and tables accordingly. Ensure that separate reports are provided for the existing renovation versus new construction envelope assemblies in Supplemental Table 1.4 for both the Baseline and Proposed Case."
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
August 20, 2015 - 12:18 pm
Sounds like you have a project that includes both new and existing envelopes.
New - Baseline according to the appropriate Table 5.5-X depending on climate zone. Proposed is as designed including the effect of framing and thermal bridging.
Existing - Baseline is existing condition. Proposed as designed.
So there should be at least two different wall types for both the baseline and the proposed. If you have walls with different thermal performance you may have more that two in the proposed.
Saju Varghese
SUSTAINABILITY COORDINATORJALRW Eng. Group Inc.
39 thumbs up
August 20, 2015 - 1:24 pm
but what if the wall if one of those components that are being reused, shouldn't it be the same in both baseline and proposed, since we are not making any changes to it?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
August 20, 2015 - 1:59 pm
Yes. That would be covered by my explanation of the existing walls. If you make no changes to the existing wall then that is both the existing condition and the as designed condition.