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PHIUS for a Commercial High Occupancy Building

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Kim Shinn
Executive Principal and Senior Wizard
TLC Engineering Solutions
LEEDuser Premium Member
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We have a client who is asking us to design a roughly 10 ksf Wellness Center for PHIUS 2021 certification.  The program includes several high density assembly type spaces - roughly 300 person peak occupant load for the building.  The Criteria Calculator that the architect showed us puts the building peak cooling load at 4 BTUH/sf (3000 sf/ton), which doesn't even cover the people load (15 BTUH/sf) at this density.

Am I missing something?

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Tue, 10/04/2022 - 19:56

Kim - I've been under the impression that the peak cooling load is only for envelope gains (sensible only). If you play around with the number of occupants in the calculator, you'll see that the peak load value doesn't change. The annual cooling demand changes, but not the peak cooling load. 

I wish I could point to a specific paragraph in the guidebook that says that's how you do it, but I don't see such a thing so if somebody else knows better, I'd be interested too. 

Guidebook - see page 28:
https://www.phius.org/sites/default/files/2022-07/Phius%20Certification%20Guidebook%20v3.1.pdf

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