[Bldg-sim] Use of simulation for ASHRAE 62.1 for compliance.

Hema Sree Rallapalli hemasree.r at gmail.com
Thu Mar 19 23:32:32 PDT 2015

Dear All,

We are working on a project where we want to make the building naturally
ventilated as per ASHRAE 62.1-2007

The prescriptive requirements for natural ventilation are as follows:

   - Naturally ventilated spaces must be permanently open to and within 25
   ft (8 m) of operable wall or roof openings to the outdoors, the openable
   area of which is a minimum of 4% of the net occupiable floor area being
   naturally ventilated. (The net occupiable floor area is measured from the
   inside surfaces of the walls, excluding permanently enclosed obstructions
   such as shafts and columns.
   - Where interior spaces without direct openings to the outdoors are
   ventilated through adjoining rooms, the opening between rooms must be
   permanently unobstructed and have a free area of not less than 8% of the
   area of the interior room nor less than 25 ft² (2.3 m²).

We have square floor plate of 1000 square meter. As per ASHRAE 62.1 only
the perimeter area with a depth of 8 meter can be considered as naturally
ventilated space. But we have designed the windows and positioned the
windows in order to encourage cross ventilation and we can show sufficient
distribution of air by doing CFD simulations. Are the CFD simulations
enough to prove that this building is compliant with ASHRAE 62.1 as a
naturally ventilated building?

Thanks for your time.
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