[Equest-users] Ventilation for System 7-Ashrae-2007-Baseline

Saurabh Kumar Srivastava via Equest-users equest-users at lists.onebuilding.org
Wed Sep 14 04:25:31 PDT 2016

Hi Guys!

I'm trying to model the Ventilation on the Baseline System 7(VAV with Reheat) based on Ashrae-2007.

My Proposed building uses 100% Fresh Air with  Demand Control Ventilation and Heat Recovery wheels.
Most of the office spaces inside have an area greater than 500sqft.

I'm trying to understand how the Ventilation  rate for baseline for such a building should be modelled.
-Would the Baseline have same Ventilation as the Proposed   OR
-Would I have to use Ashrae 62.1 Ventilation (Fresh) Air rates for all zones/Rooms  ?

Studying :-
The Table 1.4 and Appendix G of Ashrae 90.1 says:
-Demand control ventilation is modeled in the Baseline case for all spaces larger than 500 square feet that have a design occupancy for ventilation of greater than 40 people per 1,000 sf of floor area (except for spaces served by Baseline systems that do not have one of the following: an air-side economizer, automatic modulating control of the outdoor air damper, or a design outdoor airflow of greater than 3,000 cfm) per G3.1.2.5 /

-The minimum outdoor air ventilation rates (including infiltration) are the same for the Proposed and Baseline building designs consistent with Section G3.1.2.5 unless demand control ventilation is modeled for credit, in which case, the ASHRAE 62.1 minimum ventilation rates from IEQp1 are modeled for all Baseline systems where credit is taken for demand control ventilation.

Best Regards

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