[EnergyPlus_Support] Night Ventilation Setback

["elizabeth.ricker" <elizabeth.ricker@xxxxxxxxx>]

Hi,
   I am looking at modeling a single zone "building" that uses simple 
ventilation to supply 4.5m/s during the day and 1.5 m/s of air at 
night to cycle the air in the building. The inside temperature is held 
constant with an electric heater and the outside temperature varies 
for the day of the year (this is a one year simulation). When I try to 
use the simple ventilation input with natural ventilation at 4.5 m/s, 
a minimum temperature of 0, a delta temperature of 0, and a fraction 
schedule that uses 1 for the daytime and .3333 for the nightime I get 
output that is inconsistent.  It gives me airflow rates for random 
hours of the day, but not for others, and I can't find a discernable 
pattern between those times when I have air flow and when I dont.  Am 
I missing something regarding the ventilation algorithm?  Or the 
mechanism for activating ventilation?

Thanks!

-Betsy






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