[WTF_NWO]

A Zeer Pot is an ancient device used to cool things. It was invented by the Egyptians about 2500 years before Christ was born. It works on the principle of evaporative cooling. It's still in use today in North Africa and I'm going to tell you about it and show you how to make and use one.

Interesting notes: More wind speed can improve cooling efficiency. Hotter air flowing over the pot might improve the efficiency. Airflow coming off a hot parking lot might improve efficiency if your pot is in the shade because hotter air can hold more moisture which means that it can increase evaporation of the pot's moisture.

 

[nicpaige]

Hmmm never heard of it. Does this work the same at lower ambient temps? Say like 50-60 degrees or does the evaporative effect lessen?

 

[crazygary]

Hmmm never heard of it. Does this work the same at lower ambient temps? Say like 50-60 degrees or does the evaporative effect lessen?

Yes. Evaporative cooling really only works well in areas that are hot and arid. Take a drive through Southern New Mexico/Arizona and you will notice the swamp coolers on the roof. Take a drive through Minnesota and you will see an air conditioners outside of every home. The difference is Minnesota summers get hot, but the humidity is high; while the desert southwest is hot and very dry which allows water to evaporate easier.

In layman's terms evaporation is controlled by the air around it. Air that is hot and dry can hold more water then air that is cool and dry. Thus conditions that are hot and dry will evaporate water more quickly then conditions that are cool and dry.

If you want a more scientific answer I recommend reading about the dew point. Or you could just Google evaportive cooling

 

[JeepinCalifornia]

Solar Funnel Cookers, such as this one, are also supposed to act as coolers when used appropriately. Scroll down to bottom.

 

[charliemeyer007]

If you have a sling psychrometer, a psychrometric chart and know how to use them, you can accurately predict the final temperature obtained by evaporative cooling in any practical situation.