[BLDG-SIM] Variable flow laboratory exhaust systems.

Peter Simmonds peter.simmonds at ibece.net
Fri Apr 8 09:24:37 PDT 2005

OK , its Friday so I am allowed to ask for advice and guidance.

Firstly I am using VisualDoe, I am modeling the energy performance of a
200,000 sf building which has 60,000 sf of laboratories. The labs all
have fume hoods so the supply air is balanced to the exhaust air (100%
OA).. Now I have the following problem: a fan system is either on or
off, therefore the lab fans are on 24 hours a day. I would like to
reduce the exhaust flow during unoccupied periods to exhaust air from
the fume hoods at their minimum flow of 40%. Reducing the flow would
also reduce the make up of outside air to balance the flow and obviously
reduce energy consumption.

Am I missing something here or does anyone have a magic trick that will
allow me to accomplish my goal. Simply said HELP


Peter Simmonds Ph.D.

IBE Consulting Engineers

14130 Riverside Drive Suite 201

Sherman Oaks, CA 91423
p:   (818) 377-8220
f:    (818) 377-8230
m:  (818) 219-1284

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