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utilizing a photo voltaic oven as a radiant fridge at night time

utilizing a photo voltaic oven as a radiant fridge at night time

2024-03-03 16:06:51


utilizing a photo voltaic oven as a
radiant fridge
at night time


my first experiments had been throughout a winter in 1997 in kalgoorlie, an inland
location of western australia: the ambient nighttime minimal was getting right down to
2-3 levels above zero (celsius).

utilizing a box-cooker with a black base, i poured about half a centimeter deep
of water into the underside of the cooker and put it outdoors at night time. the glass
lid needed to be eliminated as glass is opaque to infrared and would inhibit the
cooling. i put the cooker (uncooker?) in a location the place it noticed a
most quantity of sky and no bushes or buildings (on the roof of my home).

the sky wanted to be clear all night time, with nonetheless air. i used to be utilizing rainwater
because the city water contained components which can have lowered the freezing level.
i’d set the alarm clock for about 5am, get off the bed and climb onto the
roof within the close to darkish (unfun) and take away a stable disk of ice from the now
uncooker
(a lot enjoyable). i received ice persistently over a number of nights, regardless that
there was no frost on the bottom, and pots of water sitting subsequent to the field
cooker didn’t freeze.

i attempted the identical experiment once more this previous summer time utilizing a smaller box-cooker
in a special location (bridgetown, wa). it was troublesome to get a sight away
from bushes. i used to be unable to make ice, and the water was solely getting about 4
levels celsius under ambient. nevertheless, when my fuel fridge died a couple of years in the past
i constructed a radiant fridge which works effectively: i received a lifeless fridge from the tip and
lay it on its again (like a chest freezer) on the south aspect of my shed (for
daytime shade). i super-insulated it with layers of aluminum foil and straw,
held along with some iron sheeting held in place with star pickets pushed
into the bottom (a really tough bush job) after sunset i depart the lid open. the
inside the lid is reflective in order that when it’s lifted at night time and rests on
my shed wall it lets the fridge ‘see’ extra sky, reasonably than the nice and cozy shed.

when i rise up within the morning i shut the lid to maintain the cool in throughout the
day. i’ve stored a log of the temperatures down there, however i am writing from
perth so haven’t got them with me. however sometimes throughout summer time the ambient
temperature could be within the low 30’s and my fridge wouldn’t rise above 16
levels. it will get a level or two under ambient throughout clear nights, on cloudy
nights it stays a bit of above ambient (attributable to thermal inertia), on wet nights
my meals will get moist. i’ve been utilizing this association for a couple of years for protecting
provisions contemporary and beer cool and am fairly proud of it.

See Also

i can see as a lot use for radiant fridges as there may be for photo voltaic cookers
all over the world and hope that different individuals take up on this. it makes use of the identical
know-how and ideas as photo voltaic cooking (allowing the alternate of warmth by
radiation while blocking the alternate by conduction) and may be made with the
similar low stage of know-how.

regards

richard mcmahon

western australia



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