[Equest-users] eQUEST vs EnergyPlus: Fan Energy Consumption

Matt Hein heinm04 at gmail.com
Thu Feb 13 10:59:54 PST 2014

I see that the files are named 'autosize'. Have you compared the size of
the systems created? Also, how do the unmet hours compare?

*Matt Hein*, PE

On Thu, Feb 13, 2014 at 11:06 AM, Simge Andolsun <simgeandolsun at gmail.com>wrote:

> Dear EnergyPlus users,
> We have modeled a test case with exactly same inputs in eQUEST and
> EnergyPlus to compare the results of these programs for an identical
> situation. This case had a PTAC system with electric heating. The fan
> inputs were as follows in both eQUEST and EnergyPlus:
> ·         0.3 inWG (74.7 Pa), 0.6 total efficiency fraction
> ·       In eQUEST: Fan control is constant volume, with night time cycling
> In EnergyPlus: Fan control is constant volume (fan control
> schedule=1) when the fans are scheduled to be on and it is cycling (fan
> control schedule=0) when the fans are scheduled to be off. I used
> AvailabilityManager:NightCycle to set this control (Please let me know
> whether there is any better way to model the same fan control condition in
> eQUEST and EnergyPlus).
> ·         California Title 24 fan availability schedules were used in
> both programs. These schedules turn the fan off during the hours listed
> below:
> Weekdays: Between 8pm-5am
> Saturday: Between 3pm-5am
> Sundays and Holidays: Off all day.
> The fan energy consumption of the two programs ended up differing from
> each other significantly. Attached are the charts that show the results of
> the coldest and warmest days. Would you let me know what might be the
> reason for this difference between the two programs?
> Thank you very much in advance for your help,
> Best Regards,
> S. Andolsun, Ph.D.
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