Hi everyone
I'm kind of confused because the explanation on the Bird's Eye View differs from the Credit Language's one. The Bird's Eye View includes the 10% Power Density Reduction and 50% Energy Star within the prescriptive option. So it looks as if we choose the performance option, we don't need to comply with the Power Density Reduction or the Energy Star equipment.
On the other hand, the credit language section (compied from the reference guide) states that one should comply with sections 5.5, 6.5,7.5 and 9.5 (Prescriptive Option) or Section 11 (Performance Option). On the next to paragraphs it speaks about Power Density Reduction and Energy Star Products. So the Reference Guide makes it look as if eventhough one chooses the Performance Option, one should ALSO comply with Power Reduction and Energy Star Products.
It may seem not as important but for our project it makes a huge difference. Can someone please tell me which is the right interpretation? I don't want to seem demanding, but an answer as soon as possible would be awesome
since an lightning redesign may be needed depending on the answer.
Thanks in advance for your help.
Nadav Malin
CEOBuildingGreen, Inc.
LEEDuser Moderator
839 thumbs up
October 20, 2011 - 7:05 am
Hi Luis,
In the Checklists area above there is a "Hot Tip" that addresses this question: "The performance option allows the project to fail to meet some of the prescriptive requirements, provided that you gain savings in other areas so that the project as a whole does not fall outside the ASHRAE 90.1-2007 boundaries for minimum energy performance."
This approach not only means that you have to do an energy model, but I believe that you also that you have to achieve the performance targets without claiming any extra efficiencies in office equipment, as that's typically not in scope of the energy model.
Luis Miguel Diazgranados
Green Factory125 thumbs up
October 20, 2011 - 12:25 pm
Thanks for the answer Nadav.
The thing is, I'm worried about the power density reduction more than about the efficiency in office equipment. Maybe some project details will shed some light in the matter.
The lightning design for the project has an LPD with a 5% reduction over ASHRAE standards. With the performance option we hoped to demostrate that we comply with ASHRAE, even though we are not meeting the LPD reduction requirement. Is this possible? Or the situation regarding LPD reduction is mandatory for this prerrequisite, and we can not fail to meet it, even if we demostrate savings in other areas? Any ideas?