----- Original Message -----
Sent: Thursday, March 20, 2003 1:28
PM
Subject: [BLDG-SIM] Simulation of Demand
Controlled Ventilation
Hello,
There are three options for values in the
min-air-sch.
1. A fraction value (ex: 0.36) in any
given hour sets the MINIMUM air as a fraction of total system air
flow for that hour. The economizer is enabled
in this case so the actual outside air could be greater than the
minimum if cooling is needed and outside conditions favor the use of the
economizer. NOTE: Be careful, even if you set the minimum OA ratio
in the system screen, you should still use that same ratio in the
schedule. Using a value of 1 will give 100% of the total system
OA, not 100% of the minimum OA.
2. A zero (0) value closes the outside air
damper AND disables the economizer. This is usually used for optimum
start periods.
3. A Flag value (-999) asks DOE to calculate
the minimum amount of outside air needed based on the number of people in the
occupancy schedule and the OA cfm/person specified in the thermal zone.
The economizer is enabled in this case so again the
actual outside air could be greater than the minimum if cooling is needed and
outside conditions favor the use of the economizer.
For
demand controlled ventilation, I've used an OA schedule flagged 24/7 (except
during optimum start periods = 0). For constant OA during occupied
periods and closed OA dampers when unoccupied, I use the minimum OA
fraction during occupied periods, "0" during optimum start, and Flag all
unoccupied hours to ensure economizer availability.
Hope
this helps.
Sheila Sagerer
Energy Opportunities, Inc
What
does -999 do in the Min-Air-Sch? Doesn't that "vote" on what OSA is needed,
and also yield to the economizer as well?
We
tried scheduling the outdoor air fraction in the Systems component of the
DOE2.1E program by using the occupancy schedule in the Loads
component. This would vary the outdoor air based on
occupancy using CO2 sensors in the Return Air. However the
schedule overrode the air-side economizer. Can this problem be fixed
in DOE2.1E?
Varkie Thomas
Hello group
Does anyone out there have
experience with simulating demand controlled ventilation in DOE2? I
am especially interested in any work that validates the use of such a
model for estimating energy savings from this control scheme. Any
advice or information would be greatly appreciated.
Thanks!
Bob
Bob Ramírez,
P.E.
Senior
Engineer
Bob@xxxxxxx , Bob.Ramirez@xxxxxxxxx
RER
is now Itron!
http://www.RER.com/Consulting
11236 El Camino Real
San Diego, CA 92130 USA
VOICE:858.481.0081X427
FAX:858.481.7550
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