Exhaust Fans in Baseline

7 posts / 0 new
Last post

Hello All,

Do we have to model the exhaust fans also according to Appendix G for a
Baseline model?
If yes, how should we design the cfm?

Thank you very much.

Regards,
Vinay

Vinay Devanathan's picture
Joined: 2011-10-02
Reputation: 0

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 Ndiaye's picture
Offline
Joined: 2011-09-30
Reputation: 200

Demba,

Thanks for your quick reply.

Regards,
Vinay

Vinay Devanathan's picture
Joined: 2011-10-02
Reputation: 0

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

Sami, Vikram's picture
Offline
Joined: 2011-09-30
Reputation: -1

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

Vinay Devanathan's picture
Joined: 2011-10-02
Reputation: 0

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 Ndiaye's picture
Offline
Joined: 2011-09-30
Reputation: 200

Demba and Vikram,

Alright. Thanks for the clarification.

Regards,
Vinay

Vinay Devanathan's picture
Joined: 2011-10-02
Reputation: 0