Hi Nick,
We?ve used 10% as a standard proportion for meeting/conference spaces in a C&S office for LEED previously with no issues. We?ve had comments specifically targeting this as a requirement for 62.1 calculations in C&S buildings when you have a multi-zone VAV system ? or any other system where the fresh air is a variable proportion of the conditioned air. We produced a notional floor plan suggesting how it could be zoned, although the level of detail used was minimal. This seems sensible given that the building upon fit-out will have a variety of space types, which will usually follow a relatively predictable layout and the design should be capable of coping with this.
Hope that helps,
Edwin Wealend
Principal Engineer
Cundall Engineering Design Consulting (Shanghai) co., Ltd
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Thanks Edwin.
FYI, I took out all conference spaces and made them open office to test the effect. While the ventilation rates and total energy consumption decreased as would be expected, the percent energy cost savings was not affected appreciably.
I am seeing a -0.2% decrease in energy cost savings between the 10% conference model and the 0% conference model. So I do not think that conference spaces affect the savings ?C assuming VAV min turndown not causing excessive reheat in these zones.
Regards,
Nick
For the 62MZCalc form I typically break down the spaces to include the perimeter offices being the area within 15?? of the exterior, an elevator lobby (maybe 200 sf), 10% conference, 10% corridor, and the remainder being the interior office space. Never had an issue on an office building having to explain that logic.
Since the baseline has to match the proposed model outside air, if you are over the ASHRAE minimum it shouldn??t impact the savings much at all by using a different breakdown of areas.