[Equest-users] [Bldg-sim] DCV per ASHRAE 62.1 in eQuest

[Bishop, Bill]

Dan,
 
[I copied the equest-users instead of bldg-sim.]
 
You need to enter zone-level OA as OA-FLOW/PER and/or OA-FLOW/AREA. The
OA flow/per (person) is what will vary the OA on an hourly basis, based
on your occupancy schedule(s). (Hourly OA = (# of people) * OA-FLOW/PER
* (% occupancy in schedule)). In order to turn OA off during unoccupied
hours, I create a MIN-AIR-SCH, coinciding with the fan schedule, set to
zero when fan is off (or night cycling) and -999 when fan is on. The
hourly OA can be verified by creating a new hourly report for the system
to track total system supply air flow rate and ratio of outside air to
total supply air.
 
Regards,
Bill
 
William Bishop, EIT, BEMP, LEED(r) AP | Pathfinder Engineers &
Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P May is National Bike Month. Bike to Work Day May 21st.
________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Dan Coutin
Sent: Friday, May 28, 2010 12:02 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] DCV per ASHRAE 62.1 in eQuest
 
Using eQuest 3.63, I am modeling a school building with a high
ventilation requirement. The schedule indicates a minimum OA cfm and
employs DCV that adds OA per occupant in a manner similar to ASHRAE
62.1:2004.
Can someone informed, please suggest 
a) how this may be best input in eQuest, and: 
b) importantly, how it may be verified in the output. 
As in real life the amount of ventilation (used/modeled) has a
considerable energy impact and needs to be particularly accurate.
I see the DCV Zone sensors options, and have read the zone/system
ventilation help, but I find the help descriptions somewhat ambiguous.
In this example the system is constant volume roof top units with heat
recovery. Unoccupied control is cycling fans with no ventilation.
Thanks 
Dan Coutin, Erdman Anthony, Albany, NY. 
coutind at erdmananthony.com 
 
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