Fabiano,
It sounds as though you are using the correct “tools” in EnergyPlus.
Report the zone temperatures during the unoccupied periods and compare to the zone setpoint. If the temperature does not exceed the setpoint in the cooling season or fall below the setpoint in the heating season, then the fan should remain off.
p.s., EnergyPlus assumes that a zone is in the “occupied” period whenever any people are present. If your People object schedule shows non-zero values (e.g. 0.02), then it is an “occupied” period.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of fabiano.ferreiracw
Sent: Friday, September 21, 2012 9:11 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Fan System Operation
Hi James,
The AHU works from 07:00 to 21:00 on weekdays and on weekends it stays off.
Using the AvailabilityManager:NightCycle, I set the thermostat tolerance to 1°C (to check if the system is working), the zone setpoint temperature is 24°C. The results shows that the system has not cycle, even on weekends.
Fabiano Ferreira
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <jim@...> wrote:
>
> The fan will operate only if the zone exceeds the setpoint temperature. Did your control zone temperature go outside that setpoint?
>
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of fabiano.ferreiracw
> Sent: Friday, September 21, 2012 8:38 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Fan System Operation
>
>
>
> Hi,
>
> To comply with the item G3.1.2.4 Fan Sytem Operation from ASHRAE 90.1-2007, where the fan needs to operate continuosly whenever spaces are occupied and shall cycled to meet heating and cooling loads during unoccupied hours, I used the AvailabilityManager:NightCycle tool with control type CycleOnControlZone. However checking the annual results, the fan didn't cycle at any time during unnocupied hour. Does anyone know what happened? I have tried use the fan type ON/OFF to comply with the item, but the result was the same.
>
> Regards,
>
> Fabiano Ferreira
>
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