[Equest-users] increased fan eff-increased gas consumption - problem.

[John Aulbach]

Venti 9won't try the rest);

With increased fan efficiency, less HP is required to move the air. Less HP 
means less motor heat. That is made up in gas heating.

Make sense?

John R. Aulbach, PE, CEM
Senior Energy Engineer

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W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
www.ptrenergy.com| jaulbach at ptrenergy.com
 
 




________________________________
From: Venkataramakrishna P <venkataramakrishna.p at tcs.com>
To: equest-users at lists.onebuilding.org
Sent: Fri, March 25, 2011 2:12:20 AM
Subject: [Equest-users] increased fan eff-increased gas consumption - problem.


Dear colleagues, 

I wanted to see how Total Electricity and Total Natural Gas Consumption 
(furnace) vary with various hvac system parameters. 9 parameters both on cooling 
side and heating side were considered and I have varied each of these parameters 
individually keeping others constant and observed how Tot-Elec and Tot-Nat-Gas 
consumptions vary with them. The system under study was a simple packaged single 
zone system with DX coils and a furnace fueled by natural gas for Abbotsford 
(Canada) climate. 


Surprisingly, when the supply fan efficiency alone was varied, increase in 
efficiency resulted in increased consumption of total natural gas. Total 
electricity variation was normal with fan efficiency. Also, increased CFM 
resulted in reduced total natural gas, while I believe these results are 
supposed to be in the other way. 


Even after a lot of brainstorming, I could not figure out what is happening and 
what is that I am missing. 


I am attaching the excel file containing these data herewith. Sheet1 has Total 
Natural Gas vs. Supply fan eff. data; and Sheet-2 has Tot-Nat vs. CFM. 


Please suggest/correct me on what I was missing here. 

Thanks a lot in advance! 





Venkata Ramakrishna P
Tata Consultancy Services
Chennai - 600113.
Phone :  +91 44 66160010
e-mail: venkataramakrishna.p at tcs.com
Website: http://www.tcs.com
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