----- 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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