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FanCG1-Visitor
1-Visitor
September 2, 2011
Question

a little confused about an example on combined cycle calculation

  • September 2, 2011
  • 2 replies
  • 5826 views

actually speaking, this thread should not be posted here. it is just calclulation method on combined cycle (thermodynamics).

I read an example on combined cycle recently. The calculation procedure considers the effect of fuel composition on thermal efficiency. when I did this calculation following the example, I found that the final efficiency would be greater than 100% if air surplus coefficient was large enough. Could anybody here tell me the reason?

p.s. I use trial and error method to estimate some parameters in the worksheet, but it is manually, can I do it automatically in mathcad?

thx

the mcd file is v11

2 replies

V
ValeryOchkov24-Ruby IV
24-Ruby IV
September 2, 2011

May be this

http://twt.mpei.ac.ru/MCS/Worksheets/PTU/PGU-eng.xmcd

will be interecting for you.

See the screenshot of this Mathcad-Web-Sheet:

CC.PNG

V
ValeryOchkov24-Ruby IV
24-Ruby IV
September 2, 2011

One example calculation of the gas mixture in the gas turbine of the Braiton thermal Cycle on Mathcad Server:

http://twt.mpei.ac.ru/MCS/Worksheets/PTU/Vv-9eng.xmcd

F
FanCG1-VisitorAuthor
1-Visitor
September 3, 2011

I think this answer will be more helpful to my confusion than your last answer. what confuses me is when I change the air surplus ratio to a higher value than what is given in this example, the efficiency based on the lower heating value of the fuel will exceed 100%. I m not sure whether it is right in this book.

I will study your example a few hours later . many thanks

V
ValeryOchkov24-Ruby IV
24-Ruby IV
September 3, 2011

Thanks for the interest on my example.

See too

WaterSteamPro for Mathcad >>>

this article >>>

and this part of my Mathcad Server >>>

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