Solar Wax Melter
Allen Dick
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I am thinking of making a solar melter. I understand
that the design is nothing particularly difficult, but I
wonder if there is any necessity to use glass on top, or
if plastic will work as well -- assuming it does not
melt.
Rodney Farrar
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Does anyone have any plans they can share? I only have
about 10 pounds of wax.
Bob &Liz
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Hello Allen &All,
I have seen both used but glass the most on solar wax
melters. . The most clever solar wax melter I ever saw
was a old refrigerator laid on its back and wheels put
under it. The beekeeper turned the melter to the south
east in the morning. At lunch he turned the melter to the
south west. The beekeeper rendered all his comb from a
2000 hive operation in two of these. He even built a
special cement pad to keep the melters on. Complete deep
hive bodies would fit inside the refrigerator solar wax
melter.
Bob
T &M Weatherhead
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Plastic does work but most plastics do not have UV
inhibitors in them so they tend to break up into little
pieces in a short time. When I tried a piece of plastic
(many years ago) it worked just as well as glass but
broke up. Allen in your part of the world, remember to
tilt the melter towards the south (north in our part of
the world) at the angle of your latitude, if that is
possible.
Trevor Weatherhead AUSTRALIA
Robt Mann
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Several modern plastics, e.g. polycarbonate or
modified acrylate with glass fibres cast in, will
certainly take the heat fine - I have used them on solar
water-heaters, which run somewhat hotter than a solar
wax-melter, and they last many years developing only
slight cloudiness. But scrap plastic of suitable area is
generally harder to come by than scrap windows. And if it
is non-flat - say, corrugated - you will have to fit it
to a frame of some sort. I see no point.
In many places, it will be easier to get a
'demolition' window, complete with hinges or at least
still having an entire wooden frame onto which hinges can
be screwed.
Any wooden cross-members are a non-problem; the
incoming solar radiation is hundreds of watts per square
m, and even if the box under the glazing is just a big
drawer or other simple wood container, with no special
insulation, the wax will melt within a few hours. This is
not a case of needing to maximize efficiency;
considerable losses can be comfortably tolerated.
Of all functions that can be subserved by solar
energy, this would be one of the most clearly ahead of
all rivals. Go solar!
Richard Yarnell
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If you do build a collector which you want to use for
several seasons, either start with a metal box, or line a
wooden one with foil or light weight sheet metal. You can
buy selective coatings for use with solar collectors
which improve performance by allowing less light to be
reflected out of the box.
Dave Cushman
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I use 4 mm acrylic sheet, double glazed 10 mm gap
It works, but not as well as glass as it blocks some
[light frequencies.
When I first made it I had three sheets and two 10 mm
gaps, but that barely worked at all.
I have plans to make a new top that is double glazed
glass and is much larger than the box.
This will allow sunlight into the box at a wider
number of angles and will thus give more time per
day.
Dave Cushman, G8MZY
Robert Brenchley
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www.beesource.com/plans/melter.htm
Robert Brenchley, Birmingham, UK.
Robt Mann
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A greenhouse - or a solar wax melter - works by
frustrating convection, it holds in the hot air.
For present purposes, half the solar radiation is
visible and half IR. (The UV, important in many ways, is
a negligible fraction of the energy flux.) Darkish
contents in the box absorb visible and IR. These contents
then glow with IR, which does to some extent radiate back
out thru the glazing - just as well as the same IR
wavelengths came in. But the warmed air can't get out and
that's your greenhouse.
Glass remains in general the champ. Strong, doesn't go
cloudy, cheap or free as demolition windows.
Robt Mann, consultant ecologist, Auckland, New
Zealand.
Ellen Anglin
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I made a small solar wax melter by putting a lid on an
old hive body, and placing a large aluminum painters tray
inside. It worked great!
I'd go out mid- afternoon, scrape out the slumgum, and
pour my melted wax into a large styrofoam cup with an
inch of hot water in the bottom. The hot water and the
styrofoam ensured that the wax cooled slowly, allowing
time for the impurities to settle to the bottom of the
tall thin wax block. After shaving off the bit of trash
on the bottom, I had a very nice cake of clean wax.
Now that I have a commercially made melter, I put a
teflon loaf pan with a 1/2 inch of water in it in to
catch the wax. The cake releases easily, and honey is
dissolved in the water. Since it has a wide bottom, it is
harder to get the trash scraped off, but wrapping the
cake in a bit of muslin or cheesecloth, and remelting a
second time usually gives satisfactory results. The wax
stiffened cloth makes great fire-starters.
Ellen in Michigan
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