[Equest-users] Supply Fan Power

Rakesh Desai rakeshdesai at ecpl.co.in
Sun Sep 16 21:56:13 PDT 2012


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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