Baseline PTAC Fan Energy for a Proposed Merv13 + Return Duct System - Goodness Me I had No Idea

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Well everyone, it seems I have hit a nerve with my original inquiry and
thank you all for your responses. After reading over the responses I
think I am going to run both the baseline and proposed fans continuously
(it seems the most conservative case) and use 0.0003 kw/cfm for the
baseline fan energy but add an A value equal to 1.4 to cover the
proposed system Merv 13 filters and return ductwork.

I think I will also modify the EIR cooling equation to use 300 w/cfm fan
power instead of 365 w/cfm power.

So baseline PTAC fan power = CFMs *0.0003 + (1.4* CFMs/4131) which works
out to be 0.00057 kw /cfm for a small 0.83 efficient motor

and baseline PTAC Cooling EIR will have a 0.10 constant instead of a
0.012167

If I ever have to submit this to LEED I will probably regret it, but it
seems to be the most logical approach. Of course logic and LEED don't
necessarily go together.

Oh well, thanks again for the feedback.

Kathryn Kerns's picture
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