I'm pretty sure that your fan power allowance in 90.1 is for all fan energy (including exhaust). So for example if your baseline fan allowance is 20kW (hypothetical), you will need to apportion that allowance between supply and exhaust similar to your designed building.
There was an extensive discussion about this around a year ago on this list (check the archives).
So, does it mean I will have to model the exhaust fan in the baseline model
but in a fashion such that it consumes power proportionate to your proposed
design (supply, return and exhaust) but falls within the Allowable Fan
System bhp value of Appendix G. Am I right?
Vinay,
It is required to also model the exhaust fans in the Baseline. Use same cfm and fan powers as in the Proposed.
______________
Demba NDIAYE
Demba,
Thanks for your quick reply.
Regards,
Vinay
I'm pretty sure that your fan power allowance in 90.1 is for all fan energy (including exhaust). So for example if your baseline fan allowance is 20kW (hypothetical), you will need to apportion that allowance between supply and exhaust similar to your designed building.
There was an extensive discussion about this around a year ago on this list (check the archives).
Vikram Sami, LEED AP
Vikram,
Thanks for your reply.
So, does it mean I will have to model the exhaust fan in the baseline model
but in a fashion such that it consumes power proportionate to your proposed
design (supply, return and exhaust) but falls within the Allowable Fan
System bhp value of Appendix G. Am I right?
Thank you.
Regards,
Vinay
Exhaust fan power is to be the same for both designs. You apportion the remaining baseline fan power allowance between supply and return/relief.
______________
Demba NDIAYE
Demba and Vikram,
Alright. Thanks for the clarification.
Regards,
Vinay