[Equest-users] Difference between fan energy consumption almost same using constant speed and variable speed fan control

[Anil Jangid]

Dear Nitin,

You can change the system type like VAV system and it will give you savings
of VFD speed. In eQuest single zone reheat with vfd option is allow to take
vfd speed savings.

Thanks
Anil
——-

On Sun, 18 Oct 2020 at 9:52 PM, Nitin Harjai via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> Hi all,
>
> I am working on the project where the project space is served by chilled
> water to meet the building heat load. And in eQuest, I have considered the
> single zone Reheat system under the Air Side HVAC tab for AHU having 14200
> CFM working 9 hours 6 days a week.
>
> My doubt is that whether I set the fan controls constant speed or variable
> speed, the software generated fan energy consumption KWh are nearly the
> same (only a  difference of 16 KWh) between both the cases.
>
> This seems that I will not get the benefit of variable speed fan control
> in case there is a VFD equipped to AHU.
>
> Can anyone help me why there is a very little difference in fan energy
> consumption using constant speed and variable speed fan in the model.
>
>
>
>
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