Hello,
Does eQuest model PVAVS systems with fan powered terminal boxes? If so,
how do you specify the power of these fans?
Additionally, in case of Appendix G modelling for LEED, is one supposed
to model System 5 with fan powered boxes or not?
Thank you,
Omer Moltay, LEED AP
Omar:
You've got me double-checking my ASHRAE 90.1-07!
There is no call in Table G3.1.1B for system 5 to have fan powered terminal units.
Also, section G3.1.3.4 only provides instructions for fan powered terminal units for systems 6 and 8.
So I would say you should omit fan powered boxes from System 5.
Where we have fan powered boxes - either in the design, or in baseline system 6/8, we typically model with a PIU system. It sounds like you want a packaged system - the default is for PIU to have chilled water, but you can change the cooling-source to DX and spec an air- or water-cooled condenser, once you've created the system.
The power (and type) of the terminal unit fans is actually specified at the zone level. I've attached the section of the DOE-2 dictionary that explains how this works. See sections "terminal-type" and "zone fans".
Aaron Dahlstrom , PE, LEED? AP