Heat Transfer from fire to human skin 1

[giant4203]

Hello,

I've been racking my brain the past few days on this one, and was hoping someone could help, as heat transfer is not my strong suit.

I'm looking to find the radiant heat Flux from a natural gas fire source to a person's skin approximately 20 feet away. Natural gas is being expelled from an accumulator through a pipe. Can anyone shed sone light on this and point me in the right direction? Thank you!

 

[IRstuff]

There are lots of literature on the subject of "fire radiative energy"

Your question is not sufficiently precise; how big is the fire? A candle-sized gas fire would produce almost nothing at 20 ft, while a 5 ft wide fire would generate a huge radiative load.

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[giant4203]

Thank you for the reply!

The fire would be about 6 ft wide and 8-10 feet tall I believe are the initial parameters we're discussing. Thanks!

 

[IRstuff]

That's pretty big, then. The radiant heat from the gas fire blasts at Disneyland can be felt on your skin from over 100 ft away.

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[AWloo]

Look into View Factors for radiation heat transfer.

 

[IRstuff]

This article might be of interest:

http://cybra.lodz.pl/Content/6307/IS_56_1.pdf

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[georgeverghese]

The API procedure for estimating radiation heat flux at a given distance from a flame generating a given heat release rate at a known luminosity is to be found in an Appendix in API521. There is an example calc there too. Its been many years since I saw that appendix - presume it is still there. There are simulation programs for this also, and PHAST is one which is available for purchase in the public domain.

 

[EmmanuelTop]

Check also

http://alarp.net/loss-prevention/safe-layouts/8-flare-radiation-calculation.html

- there is API 521 5th edition; refer to section 6.4.2.3 and Annex C for radiation calculations.

There are also spreadsheets from OGPE - haven't tried them myself but apparently of good quality:

https://sites.google.com/site/oilga...Temperature 2010 VerA.xlsx?attredirects=0&d=1

https://sites.google.com/site/oilga...are Sizing 2015 Ver A.xlsx?attredirects=0&d=1

Dejan IVANOVIC
Process Engineer, MSChE