Dear All,
Our project is aiming for the Flush-out option of this credit.
1) For the car parking (on the Ground Level), the air is exhausted by dedicated exhaust fans as per ASHRAE 62.1. For the flush-out, can we consider that exhausting a certain CFM of air will introduce the same CFM of fresh air (given that the parking is partly open to the external environment)?
2) What is the best way to achieve this credit for naturally ventilated areas under the flush out option? Since these areas aren’t served by HVAC systems providing fresh air, do we have another option to comply with the “Flush-out” option?
Thanks,
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
March 15, 2013 - 12:30 pm
Omar,
1) Parking garages usually aren't considered in the flush out in my experience. However, your logic is correct regarding the exhaust = fresh air in.
2) This is covered in the information above: "In naturally ventilated buildings or other situations where using the HVAC is not possible or desired, alternatives such as temporary supply and exhaust fans placed in the windows are also possible. (Simply opening the windows is not enough, however.)"
Kerrie Racicot
1 thumbs up
November 7, 2013 - 4:33 pm
Dylan,
When you say "exhaust = fresh air in", do you mean that if x cfm is exhausted via dedicated exhaust fans then x cfm of OA is introduced to the space? Therefore, it would be acceptable to provide OA via HVAC units as well as "pulling in" OA via exhaust at the same time? It seems that the EPA IAQ Design tools speaks only to spot ventilation via window/door exhaust fans and not dedicated exhaust systems.