ASHRAE 62 Ventilation Requirements 1

[Bigwiggz]

I have heard from so many sources that the ventilation requirements for a building no matter what it is should be 15 CFM per person. However, I thought that that is what the ASHRAE 62 (1989) requirement says. Now we have the ASHRAE 62 (2010) requirement which says that for places of religious worship there needs to be 5 CFM per person and 0.06 CFM per square foot. If that is the case the ventilation rate in every zone is at least halved. My questions are the following.

1) Is the ventilation rate for places of religious worship 5 CFM per person plus 0.06 CFM per square foot per ASHRAE 62 (2010)? Example A room with a maximum occupancy of 230 people and 2800 square feet would be (230 people)*(5 CFM per person)+(2800 square feet)(0.06 CFM per square foot)= 1318 CFM

or is it 15 CFM per person which would give me the results of 3450 CFM

2) Also, is there other methods for reducing the ventilation air requirement? (i.e. air ionizers in the air handling unit or other means)?


Thanks for your help

 

[cdxx139]

The ventilation rate is whatever code is enforced where your project is. If its 62-89?, then 1318, if its 62-10?, then its 3450. My state enforces 62-2004 right now.

"Ive heard from many sources" Are these souces engineers or contractors? This sounds like a contractor "rule of thumb" where everyone gets 15 cfm/pers. No offense to contractors, but they geenrally reduce a whole standard (like 62), to an easy sentence, and thats fine for what they do. But you as the engineer, need to read the fine print of 62, and know thjats not true in all circumstances.

Never believe what people say. Listen to them, but always confirm. 15 cfm/person for everyone WAS generally correct for most spaces (some were 10 cfm/pers, other spaces were 20 cfm/pers).

You can reduce the ventilation rate (per 62-2010), by your delivery method. See Table 6-2.

knowledge is power

 

[Bigwiggz]

Thanks cdxx 139

And yes these sources are contractors, one was a senior estimator for HVAC equipment installation. Thanks for your answer.