[Equest-users] Supply Fan Power

[Gopi K Subbiah]

Rakesh,

My understanding is your fan can not be considered as cycling fans
since it's not running during unoccupied hours / Night. In your case,
supply fan power shall be calcualted during only building working
hours and fan power can be calculated per G.3.1.2.9. So your fan power
will be included in EER.

Also make sure outside air ratio is zero during unoccupied hours in
your equipment hourly results.

Hope this helps.

GK


On 9/17/12, Rakesh Desai <rakeshdesai at ecpl.co.in> wrote:
> Dear Vignesh,
>
>
>
> My supply fan shall operate only when building is working. Can it be
> considered as cycling fan as per G 3.1.2.4?
>
>
>
> If yes, then if my supply fan energy is included in the EER rating of the
> equipment, then is that I do not have to consider supply fan energy as per
> Table G 3.1.2.9 additionally and in my model supply fan energy to be set to
> zero for all zones?
>
>
>
> With best regards,
>
>
>
> Rakesh Desai
>
>
>
>
>
>
>
> From: vignesh kumar [mailto:vigneshkumar1986 at gmail.com]
> Sent: 14 September 2012 15:55
> To: equest-users at lists.onebuilding.org
> Cc: Sauraj gautam; vignesh.kumar at iesve.com
> Subject: Re: [Equest-users] Supply Fan Power
>
>
>
> Dear Rakesh,
>
> You are correct  in the  section G 3.1.2.1 it is specified as that  Base
> case system efficiencies are inclusive of the indoor fan power.
>
>  But as per the G3.1.2.4 the supply and return fans shall operate
> continuously whenever spaces are occupied and shall be cycled to meet
> heating and cooling loads during un-occupied hours . if the supply fan is
> modelled as cycling and fan energy is included in the energy - efficiency
> rating of the equipment, fan energy shall not be modelled explicitly.
>
> If the above case is not true then  you can follow the  method specified in
> Alternative calculation manual(Ref attached image) to segregate the Fan
> power from the total EER if you know the combined EER at a particular dry
> bulb and wet bulb temperature(may be even at AHRI condition) having said
> that the fan power for all the fans has to be calculated as per the
> Table-G3.1.2.9
>
>
>
> Hope this helps
>
> 	
> 		
> Vignesh Kumar
> Senior Project Consultant
> LEED Green Associate.
> BEE-Energy Auditor.
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