Dear All,

eQuest allows inputing of infiltration airflow as CFM/ft2 (of indoor
space in detailed mode) for every zone.

I have calculated CFM/ft2 values for each zone in my model, but this
calculation has been done for a outside - inside pressure difference of
50 Pa. Or I can do the calculation for any arbitrary pressure difference.

The question is, since infiltration is very much pressure dependent,
what pressure difference does eQuest assume when the infiltration
airflow input is utilized? I know that it will not take into account the
dynamic changes in pressure dif. during the simulation due to wind
effect or other effects, but I just want to be able to input a
reasonable value since a calculated infiltration at 50 Pa is very
different from say, at 5 Pa. The answer is of course, at whatever
pressure difference the zone is anticipated to be operating, so what
would you recommend for low-rise commercial buildings? Or any other
guidance would be appreciated.

Or should I convert my calculated values to ACH and use that input, as
that takes into account wind speed changes? Again, what is the reference
pressure dif. to use there?

Thank you,

?mer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP
Mimta EcoYapi, LEED Proven Provider
Hekimsuyu Cad. 559. Sk.
No:39 34255 Kucukkoy Istanbul Turkey
Tel: 90-212-617-2296
Fax: 90-212-617-2297
Mobile: 90-533-957-1394
www.eco-yapi.com
www.buildingenergymodels.com