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Using the solar oven principle, store that heat in a
suitable material or fluid and with an easy change of
casing, place the heater in a cold area of the house.
I am imagining the heater, in store mode, to be heavily
insulated on three sides, painted in black absorbant
pigment on the inside,
with the best oneway thermal
glass possible. This unit can be tilted slightly for sun angle
variances. Lenses and mirrors are also a possibility but,
an all day, sunny position still has to be found.
On bringing the heater inside, the case can be opened
and the core is rotated, placing fins that were on the
insulated side, onto the glass. The glass is also reversed
allowing all that lovely stored heat to ebb out.
"Johnny, be a good boy and bring in the heaters, Grandma
wants her rocks."
Hot Asteroid Power
Rocks orbit near the sun to heat up, then are insulated to bring the heat to Earth [sninctown, Jul 11 2021]
||why not call it "fins", "glass", "solar oven", "sun tracker", or a
great many other names which capture merely parts of this
idea? i would include the wikipedia link to each of the
above, for clarity, but that seems a bit redundant.
||technically, there's no such thing as "one-way glass"; rather,
the glass can be coated to reflect rays in the thermal
infrared band but transmit rays in other bands. a "one-way
mirror" only appears such because of uneven lighting on the
||i proposed an orbital version, somewhat similar to this idea,
some time ago, but it had many problems.
||Grandma doesn't live in orbit?
||As per "Solar Heating Robot", you need a large area for
heating & a small (surface) area for storage; & using a liquid
is much easier than moving solid lumps.
||Kids are young and regular muscle training can't hurt.
They might even think round. Even an electronically