To achieve the required time needed for flush out, do we only take into consideration the OA louver volume (CFM)? So if we have a total flush volume of 15,000,000 and the OA louver has a CFM volume of 250 then our flush out time would be 41.7 days. Is this correct? I would think we would have missed some variables by doing that.
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
armando chamorro
CIH, LEED AP, CBCPCIH Environmental Solutions
4 thumbs up
May 8, 2012 - 5:23 am
Mark
Are you sure there is only 250 cfm of outside air coming into the HVAC? The flow seems to be too small unless the building is also very small. What are the dimensions of the areas to be flushed out?
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
May 8, 2012 - 11:47 am
15,000,000 CF of Air / 14,000 CFM/SF = 1071 SF.
Hopefully your HVAC unit is capable of Economizer. In which case, the unit may have a minimum OA of 250 CFM but a maximum OA of 100% of the total SA.
If the unit doesn't have economizer capabilities. Consider bringing in a temporary fan/conditioning unit that can bring in OA (make sure you stay within the temperature and humidity requirements) to reduce the flush out time. Or if you have operable windows open the windows while flushing and go with the testing method.