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Julian,
Appreciate your input....
I attach the spreadsheet I built using the original Auto Ignition Equation given in the text. There is discussion of convection losses in the paper.....
You can see it uses similar data.
The ignition temperature of paper is 247 deg C
The solar image in other configurations can be much less than the example, hence the Heat Flux is amplified.
It would be of great interest to see how "real life" experiments correlate to these mathematical models.
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