[Homeroast] On Topic: Popper-Roasting
john at chocolatealchemy.com
Fri Jul 12 10:58:08 CDT 2013
So far, in about 15 years of playing with nichrome, what I have found
is that in theory, that is true, but in practice the element just
burns out and breaks. For very heavy nichrome in non-corrosive
atmospheres like a kiln (per your reference) it has a better chance
of being true but in roasting applications, where the wire is thin
they just burn through quickly.
At 03:59 PM 7/11/2013, you wrote:
>On Thu, Jul 11, 2013 at 08:28:17AM -0700, John Nanci wrote:
> > To my knowledge, nichrome (or any resistive heater) does not 'tire
> > out' to any noticeable degree. They fail, but that's it. So you
> > can take that off the table.
> The resistance of the elements will increase with age, due to the
> reduction in cross section by oxidation, and also, due to
> elongation of the loops. This will result in decreased power
>Of course, many of the same things that cause this aging also
>contribute to the eventual failure. I was hoping to find confirmation
>of the longstanding impression I have that, in the sort of wire-coil
>heaters we're talking about here, there wasn't usually a whole lot of
>increase before they would check out. OTOH, especially when talking
>about a popper that's working well up to some roast level but then
>struggles (and maybe fails) to go further, small changes in the roast
>chamber inlet temperature can make a surprising difference.
>Happy Holidays! Cry "Charge it!" and let slip the dogs of more.
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