We are modeling a new LEED school building that is an addition of an existing complex buildings. The simulation was made using HAP. We are using the existing school chiller to provide water to the new addition. The energy source is classified as a District Cooling (Option2). When we model the new building including the whole chiller plant system as the Treatment of District Thermal Energy 2009 requires, the energy savings drops from 22% without DES to 7% since is a small pie out of the big pie. A building with only 7% of energy savings does not comply with the EAp2 requirements which are 10% minimum. We are penalised for using DES, is this accurate?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 23, 2013 - 9:01 am
The whole idea behind the DES guidance is to accurately account for the efficiency of the central plant. If you have a poor one it hurts your savings and if you have a good one it helps. So it is entirely possible.
jose Babilonia
August 26, 2013 - 2:57 pm
Thanks for your help. It is necessary to model the complete building not just the addition? If we do it that way it is correct to include the total building area in the new building simulation?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 26, 2013 - 3:46 pm
If following the DESv2 or Appendix G you do not have to model the whole building.