[ExI] puzzle

[William Flynn Wallace]

Here is what the books says:

Around sundown, Egyptian women placed water in shallow clay trays on a bed
of straw.  Rapid evaporation from the water surface and from the damp sides
of the tray combined with the nocturnal drop in temperature to freeze the
water - even though the temperature of the environment never fell near the
freezing point.  Sometimes only a thin film of ice formed on the surface,
but under more favorable conditions of dryness and night cooling, the water
froze into a solid slab of ice.   bill w

On Thu, Jul 2, 2020 at 4:04 AM Ben Zaiboc via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

> On 02/07/2020 01:38, Adrian Tymes wrote:
>
> In large evaporative coolers: https://en.wikipedia.org/wiki/Yakhch%C4%81l
>
> On Wed, Jul 1, 2020 at 1:36 PM William Flynn Wallace via extropy-chat <
> extropy-chat at lists.extropy.org> wrote:
>
>> Here is one I ran across in an article on air conditioning.  In ancient
>> Egypt ice was made.  How did they do it?
>>
>>
> I don't know if evaporative cooling on its own could make ice, but it gets
> very cold at night in the desert, so maybe repeated exposure at night and
> insulation through the day would do it.
>
> --
> Ben Zaiboc
>
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