[Equest-users] Appendix G3.1.1 Exception d - Ventilation of Laboratory Spaces During Unoccupied Periods

[Ömer Moltay]

Dear All,

For a LEED project we are modeling a research laboratory building where 
in the proposed case most of the lab spaces are provided with 6 ACH 
during occupied and 2 ACH during unoccupied periods for health and 
safety reasons.

I am assuming that the corresponding HVAC system for these spaces would 
be defined by G3.1.1 Exception d and that separate HVAC systems shall be 
provided for each laboratory space with more than 5000 CFM exhaust.

Assuming my approach is correct, the question is how to model this in 
eQuest? We are inputting ACH values at zone level. Is there a way of 
dynamically adjusting these ACH values on an hourly basis (ie. 
schedule?). When G3.1.1 Exception d requires that exhaust and make-up 
air volume be reduced to 50% of design values during unoccupied periods, 
is the correct approach to provide 6 ACH (=proposed flow rate) during 
occupied and 3 ACH during unoccupied periods?

Thank you for any responses,

Omer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP, BREEAM Assessor
Mimta EkoYapi
Hekimsuyu Cad. 559. Sk. No:39
34255 Kucukkoy Istanbul Turkey
Tel: 90-212-617-2296
Fax: 90-212-617-2297
www.eko-yapi.net <http://www.eko-yapi.net>

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