Our project consist in a conversion from a warehouse to a university. but only part of the univeristy is being certified. Obviously as a warehouse the building didnt have any type of insulation for which in the renovation insulation was added. I see that under the refence guide, the propose needs to be modeled with the existing envelope, however, it does not really make sense to us that we could not take advantage of the insulation given the fact that the boundary is quite big and we are using a big percentage of the envelope being modified.
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 14, 2013 - 3:22 pm
I assume you are referring to ASHRAE 90.1-2007 Appendix G, Table G3.1-5(Baseline)(f) which allows the modeling of the existing envelope in the Baseline. You model the proposed as it was designed, not as it was previously existing. This particular credit has nothing to do with insulation levels so in the future please post under the appropriate credit.
Catalina Caballero
Sustainable DesignerJALRW
August 14, 2013 - 3:53 pm
Maybe I didnt title it correclty but Im refering to Option 2, where for modeling the propose alternative the guide says: use existing values. My existing values are a warehouse with solid concrete walls without insulation, but after renovation is finished the building will have new insulation, therefore not really sure which values to used for the baseline and the proposed envelope for the modeling.
Catalina Caballero
Sustainable DesignerJALRW
August 14, 2013 - 4:01 pm
Please refer to the "LEED Project Submittal Tips: Commercial Interiors 2009" where says that Table G3.1-5(Baseline)(f) is applicable
http://www.usgbc.org/resources/leed-project-submittal-tips-commercial-in...
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 16, 2013 - 8:51 am
Yep I saw that and it is also being discussed in the post above this thread. Just because it is written does not mean it makes any sense!
What does not make sense to me is why it is written there. For this particular credit you can only claim savings related to HVAC systems and equipment. Therefore it only makes logical sense that any other building parameter must be held neutral in the energy models or they would influence the savings.