Mary Fisher wrote:

Perhaps you need to think along the lines of how people in hot countries
use pottery jugs etc to keep liquids cool. The slow seepage of liquid
through the material cools the jug via evaporation.


Yes - and I use that method a lot when under canvas, have done for 60 years.

But it's not the same thing as coolking a larder in a building.

No reason it could not be with a bit of lateral thought. Coolroom on the
outside of the building with a permeable panel when the window might be,
backed with a small reservoir made from something non permeable. The
outside surface would support the evaporation and the whole reservoir
would then cool. This would give a large cool surface in the room.

You could enhance the evaporation with a double skin on the outside and
a solar PV panel driving a fan to add some forced circulation through
the evaporating layers.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/