[BLDG-SIM] Underfloor air system

[Chris Jones]

eQuest (DOE2.2) and DOE2.1 don't model air flow so you have to make some 
assumptions based on the design of the underfloor system in question.  You 
can't outright take a credit for lower fan energy unless the designer 
actually design a lower fan static system.  Many underfloor systems use a 
higher supply temperature (69F instead of 55F) but that has to be confirmed 
for your case. In come climates the humidity dictates that you need to 
supply at lower than 69F. Some claim that you can model with a higher space 
setpoint temperature due to the stratification of temperatures but that 
depends on the type of diffusers and the ceiling height in question.  Most 
North American underfloor systems use a Krantz style diffuser which mixes 
in the zone level.  This is not a true displacement ventilation system.

I have seen underfloor designs which save energy and I have seen some that 
use more energy due to the particular design.  You need to confirm what the 
designer is specifying.


>Hi,
>I'm trying to model an underfloor air system in eQUEST for a project that 
>I am doing. Its an office building. What is the best way to go about it? 
>What would the reduction in static pressure on the fans be?
>
>Thanks
>
>
>Vikram Sami
>
>ENSAR Group, Inc.
>2305 Broadway
>Boulder, C0 80304
>(303).449.5226 Tel
>(303).449.5276 Fax
>
>
>
>
>
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Chris Jones, P. Eng.
14 Oneida Avenue
Toronto, ON M5J 2E3
Tel. 416 203-7465
Fax. 416 203-8249




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