I am in the process of simulating 7 floor office building. Five of these floors are designed as open space offices, the others are designed as small offices. In fact these drawings are showing only one of the possibilities of tenant outfit, the final outfit will not be known until the end of construction, it depends on the tenant decision.
We would like to gain credit for demand controlled ventilation. There will be a requirement for DCV only in open space offices outlined in the tenant lease and sales agreement. There will be no requirement for DCV in small offices because the ventilation system included CO2 sensors in small offices would be too complicated and expensive (it means around 100 CO2 sensors per floor – 1 in every office). In all of the floors the ventilation system will be prepared for DCV and the tenants are required to install DCV only if they use open space offices as outlined in tenant lease.
Could you give me an advice in which floor and space can I gain credit for DCV? Can I gain credit for DCV in five floors as designed on actual drawings that represent assumed outfit? Or can I model DCV in all 7 floors where the ventilation system is prepared for DCV? Do the outfit drawings have any effect on the simulation when the real outfit is not known?
Many thanks!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
April 12, 2012 - 9:45 am
You can only claim savings for measures in tenant spaces which are required in a lease agreement. If there are two different potential lease agreements (one with and one without DCV) then DCV is not assured on any of the floors and you cannot claim any savings for it in the baseline and proposed model.
You may be able to justify a certain mix of open/closed office as an exceptional calculation (EC). If the developer can determine the likelihood of open vs closed based on historic data in their buildings then that could be used to justify the modeling of DCV on a certain percentage of floors. Doing this as an EC allows you to fully justify the assumptions you are making to the reviewer. Don't just state your assumptions, justify them.
The drawings should have no effect unless they were based on the developer's past experience.