Dear Richard
----- Original Message -----
From: "Richard Stanley" <[email protected]>
To: "Discussion of biomass cooking stoves" <[email protected]>
Sent: Thursday, March 08, 2012 1:51 AM
Subject: Re: [Stoves] radiant heat capture, total heat measurement
Kevin & Frank:
Can I add my own experience with heating coffee in our microwave ?:
Certain iron rich clay cups will get hot as heck with luke warm coffee
inside, while the other more "pure" clays and glass cups don't --while
their contained coffee rises to near boil in 30 odd seconds. U wave bands
are admittedly not in the IR band widths but it seems to offer a certain
parallel here, in the discussion of emissivity/ reflectance, or no ?
# I think there is a very simple mechanism at play here.... It is not so
much the "iron rich clay" that makes the cup get hotter than the coffee, but
rather, that the clay from which the cup was made is porous, and has
absorbed water from soaking in teh sink, while being washed. As an
experiment, take one such cup, that heats up, and put it in a conventional
oven for a period of time (several hours) to dry it out. Then repeat the
test in the microwave, and see if the body of teh cup gets hot.
Best wishes,
Kevin
Richard Stanley
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