Forum discussion
NC-2009 EAp2: Minimum Energy Performance
How should projects that feature life-support systems for medical purposes account for their energy loads to comply with the prerequisite? These are 24/7 systems that also require redundancy so there is a huge energy load associated with the HVAC and lighting.
Can these life-support systems be separated out in the energy model as "process" loads or categorized a different way to ensure our ability to comply? Any input is appreciated. Thanks.
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
September 23, 2010 - 5:15 pm
Basically you are required to model the proposed building as it has been designed and in alignment with how you expect it to be operated. You should model the project as accurately as possible within reason, taking into account the amount of effort relative to effect.
So you cannot separate out any expected energy uses, they all must be included in the model. Even non-regulated, process energy loads must be included.
Lance Collins
DirectorPartner Energy
11 thumbs up
September 24, 2010 - 12:56 pm
Marcus, thank you for your reply. To give you more details on our condition......The challenge with our project is that it isa vivarium occupancy. Our understanding is the requirement for the base model to reflect the same outdoor air intake requirements as the design model. The project is interested in operating at 10 air changer per hour within the animal space, the recognition that vivariums are often designed for 15 air changes is not applied to the LEED model. The base LEED model would reflect 10 air changes as well, resulting in a zero net energy savings. Although you can take credit for reduced airflow by controls strategies, these strategies are associated with reductions from the design outdoor air requirements. Since the animals remain within the holding rooms, no reduction based on non-occupancy can be applied.
Any additional advice or input is appreciated.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
September 24, 2010 - 1:49 pm
Yes according to the modeling protocol the ventialtion rates should be the same. In order to claim any savings you will have to follow the exceptional calculation method. You will need to prove that the 15 ACH is standard industry practice for the application. In order to do so you should cite sources which back up your claim like an ASHRAE Handbook for example.