[Equest-users] Supply Fan Power

Rakesh Desai rakeshdesai at ecpl.co.in
Sun Sep 16 23:10:53 PDT 2012


Gopi,

Thank you.

It means I have to model my supply fan power separately and it need to be
deducted from EER of the equipment and equipment EER to be modified as per
attached formula.

Please confirm.

With best regards,

Rakesh Desai 

-----Original Message-----
From: Gopi K Subbiah [mailto:gosub79 at gmail.com] 
Sent: 17 September 2012 10:55
To: Rakesh Desai
Cc: vignesh kumar; equest-users at lists.onebuilding.org; Sauraj gautam;
vignesh.kumar at iesve.com
Subject: Re: [Equest-users] Supply Fan Power

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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