Hello all,
We want to achieve this credit for a manufacturing facility. The air supplied to the production area is delivered through 26 propeller hooded roof fans and each one supplies 20,000 CFM to the ventilation zone. The ventilation rates supplied to the space are much higher than the ventilation rates stated by ASHRAE 62.1-2007, due the low occupancy. Therefore we would like to justify the credit monitoring the ventilation performance through the BMS to verify the correct performance without having the airflow measurement devices. If an equipment fails, an alarm will be send to the central monitoring and the maintenance department will be notified.
This is because the purpose of the credit is to avoid the CO2 concentrations in the spaces, but evaluating the proportion of the space, the quantity of occupants in the area and the ventilation rates in the ventilation design this condition will not happen, and also the ventilation system will operate continuously during the occupation hours, this way we can corroborate that the outdoor air flow is according the project. Could this be acceptable for reaching this credit?
Thank you in advance.
Regards,
John McFarland
Director of OperationsWorkingBuildings, LLC
LEEDuser Expert
42 thumbs up
April 1, 2015 - 10:11 am
Sorry, but you're not meeting the credit requirements by not providing either airflow monitoring or CO2 sensors. That said, I see your predicament as it would be hard to install airflow monitoring on those fans. An alternative approach that I have seen used is to install CO2 sensors throughout the space (even though it is not densely occupied) and use that as the indicator of proper outdoor air delivery. Use Appendix C in ASHRAE 62.1-2007 as a guide on how to calculate the appropriate CO2 differential concentration.
As an aside, I like your plan to have the BMS alarm if the fan(s) fail to operate. Keep that even though it doesn't earn the credit. It's the right solution (in my opinion).
-John