I need expert advise on handling non AC building (naturally ventilated) for applying for LEED NC rating system. The issue is meeting minimum energy performance of 10% over ASHRAE 90.1 2007.
This is very difficult by considering the chillers COP is same for both Base and Proposed case in the energy modelling and take benefits of other energy measures to meet this 10%. This project is a textile factory and the process load is 80% of the total load. This is even more difficult to meet this 10% requirements.
Pls advise us how to handle these projects and this project coming up in Bangladesh
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5900 thumbs up
November 18, 2011 - 9:07 am
If you are not installing air conditioning in the Proposed building then put air conditioning in both models but set the temperatures in the cooling season so high that the system never comes on.
Since it is a process intensive facility you may need to claim energy savings from the process itself. The procedure to do so has been explained several times within these comments.
Sundararaj Subburaman
143 thumbs up
November 27, 2011 - 9:38 am
Thanks for the reply. I understand that there are no standards available that can be taken as a base case for process energy (like ASHRAE std for non process energy). Is it okay if the manufacturer or owner certifies the base case process energy to compare with the proposed case and demonstrate savings.
Pls let me know your views.
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
November 28, 2011 - 11:47 am
The default assumption is that process loads should be identical in both the baseline and proposed cases for modeling. If you want to claim savings within the process load you need to provide detailed information about your approach, and why you believe the proposed savings is justified. You need to be very clear in you explanation of why the proposed approach is beyond standard practice - if possible show examples of similar buildings using the baseline approach. The bar is purposely set pretty high here - the burden of proof is on you to show that what you propose is better than standard practice.
As Marcus noted, this has been addressed multiple times in this forum. Please read through some of the previous postings.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5900 thumbs up
November 28, 2011 - 2:41 pm
The manufacturer or owner stating that they feel that the Baseline is standard industry practice doesn't hurt but is insufficient by itself. As Chris says you need to make the case that the Baseline is a reasonable one. Depending on the situation this could entail a rather lengthy explanation and supporting documentation (i.e. studies, research, etc.).