27 Jul '13, 10am

Gas combustion, moisture effects on bean surface. Interesting discussion in the Home-Barista roasting section

"Given that the first crack is a direct result of the water vapor expanding inside the beans its reasonable to assume that the beans are losing water content all the way up to and through first crack. This is however easy to find out by dumping the beans at different times and measuring the weight". I know what first crack is. My point was the water vapor from the beans will essentially be non-existant towards the end of the roast, when the beans are at their most vulnerable. This is more prominent for people who want to roast past Full City. "But how can you say anything about the size/effect of the water content from the combustion without comparing it to something?" easily, because it's the only topic we're discussing. water vapor is produced from burning propane, not the energy from an electric roaster. So you're comparing a measurable quantity to "0". You might as wel...

Full article: http://www.home-barista.com/home-roasting/combustion-of-p...

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Combustion air in a very tight house #green

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