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

[Venkataramakrishna P]

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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