4 ms·

This has actually been around for hundreds, if not thousands, of years: https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator https://en.wikipedia.org/wiki/Pot

by milge 11y ago

This has actually been around for hundreds, if not thousands, of years: https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator

JacobJans 11y ago
Amazing. These cost less than a stamp in the US. Think about that the next time you mail a letter! > The pots sell at 40 US cents a pair https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator#cite_note-Kanwaljit-7 https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator#cite_n...
- hugh4 11y ago
  Honestly it's pretty amazing that having a physical piece of paper collected, sorted , put in a plane, and hand-delivered to someone's door thousands of miles away is so freaking cheap. Postage stamps are crazy.
  - jacquesm 11y ago
    In many places physical mail is extensively subsidized.
jahnu 11y ago
The Iranian city of Yazd is full of windcatchers and qanats which use evaporative cooling. https://en.wikipedia.org/wiki/Windcatcher https://en.wikipedia.org/wiki/Windcatcher Highly reccomend a visit there. It's facinating. Also the roofs of some old houses in Malta have a small shallow pool to cool the house.
hakcermani 11y ago
Wouldn't a metal inner pot help with better heat transfer ?
- zdean 11y ago
  Maybe, but probably cost prohibitive for anyone that would be using one of these.
nickpsecurity 11y ago
Didn't know about those. Neat. Thanks for the link.
flashman 11y ago
What temperature can these devices reach? Edit: I found as low as 11 deg Celsius http://www.lifehacker.com.au/2013/01/make-an-electricity-free-zeer-pot-fridge-to-keep-your-drinks-and-food-cool-in-the-sun/ http://www.lifehacker.com.au/2013/01/make-an-electricity-fre...
david-given 11y ago
See also botijos: https://en.wikipedia.org/wiki/Botijo https://en.wikipedia.org/wiki/Botijo (Single-walled porous clay pots for storing water in. Water flows through the clay, very slowly, evaporates from the outside, and keeps the water inside cool. I imagine they break forever if you put a liquid that's not water in them as the pores clog up.) I know someone with one. It works really well, and is ideal for camping or off-grid trips.

by milge 11y ago

This has actually been around for hundreds, if not thousands, of years: https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator

JacobJans 11y ago

Amazing. These cost less than a stamp in the US. Think about that the next time you mail a letter! > The pots sell at 40 US cents a pair https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator#cite_note-Kanwaljit-7 https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator#cite_n...

hugh4 11y ago
Honestly it's pretty amazing that having a physical piece of paper collected, sorted , put in a plane, and hand-delivered to someone's door thousands of miles away is so freaking cheap. Postage stamps are crazy.
- jacquesm 11y ago
  In many places physical mail is extensively subsidized.

jahnu 11y ago

The Iranian city of Yazd is full of windcatchers and qanats which use evaporative cooling. https://en.wikipedia.org/wiki/Windcatcher https://en.wikipedia.org/wiki/Windcatcher Highly reccomend a visit there. It's facinating. Also the roofs of some old houses in Malta have a small shallow pool to cool the house.

hakcermani 11y ago

Wouldn't a metal inner pot help with better heat transfer ?

zdean 11y ago
Maybe, but probably cost prohibitive for anyone that would be using one of these.

nickpsecurity 11y ago

Didn't know about those. Neat. Thanks for the link.

flashman 11y ago

What temperature can these devices reach? Edit: I found as low as 11 deg Celsius http://www.lifehacker.com.au/2013/01/make-an-electricity-free-zeer-pot-fridge-to-keep-your-drinks-and-food-cool-in-the-sun/ http://www.lifehacker.com.au/2013/01/make-an-electricity-fre...

david-given 11y ago

See also botijos: https://en.wikipedia.org/wiki/Botijo https://en.wikipedia.org/wiki/Botijo (Single-walled porous clay pots for storing water in. Water flows through the clay, very slowly, evaporates from the outside, and keeps the water inside cool. I imagine they break forever if you put a liquid that's not water in them as the pores clog up.) I know someone with one. It works really well, and is ideal for camping or off-grid trips.