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Calculating Combustion Heat Transfer

combustion heat transfer heat exchanger gas burner

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#1 mjc123red

mjc123red

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Posted 22 April 2012 - 02:17 PM

Hi, Can anyone help?

I am having problems calculating or finding any suitable material to determine a calculation regarding:

A gas boiler with a force draught gas burner firing into a secional boiler. I need to calculate the heat transfer of the products of combustion through the heat exchanger.

i assume it will be radiation,conduction and convection with approx 10% losses via flue and casing lossess etc

Any suggestion where to start?

Thanks

Martin

Edited by mjc123red, 23 April 2012 - 03:38 PM.


#2 Art Montemayor

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Posted 24 April 2012 - 08:28 AM

Martin:

This is a combustion problem leading to a heat exchange problem. You must resolve what is happening in the combustion section first by making a stoichiometric calculation and identifying what the products of combustion are - qualitatively and quantitatively. That means you produce a complete flue gas analysis.

With the flue gas analysis and the combustion temperature you find the film coefficients on the flue gas side and you calculate the overall heat transfer coefficient. Knowing the total heat produced by the combustion, the flue gas analysis, the overall U, and the Log Mean Temperature Difference, you can calculate the heat transfer area.

#3 mjc123red

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Posted 24 April 2012 - 02:42 PM

Thanks Art, will take your advice and investigate further.

martin

#4 Shivshankar

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Posted 25 April 2012 - 03:37 AM

mjc,
Find attached PDF.

As stated by Art, you can solve your questions. for further reading read this material.
Hope this will help you !


http://eyrie.shef.ac...30/comfun1.html
http://www.gutenberg...rs/fluegas.html

Regards
Shivshankar

Attached Files


Edited by Shivshankar, 04 June 2012 - 08:43 AM.


#5 mjc123red

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Posted 25 April 2012 - 01:53 PM

Many thanks for your help.

Kind Regards

Martin




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