The Process of Freezing Ice in the Desert According to Physicists

Not many people know how humans in the past freeze water in the desert. Physicists from the University of Pennsylvania unveiled the way the ancient Persian civilizations of 2000 years ago made ice.

Without a cooling machine – just like it was done in the modern era, the ancient Persian people turned out to have their own technology to make ice.

The technology called ‘night sky cooling’ uses natural processes of sky power at night to start the process of freezing water. The deserts are dry and relatively cold and without clouds at night can easily change the water temperature.

The heat in the desert will be carried into space that has a temperature of around minus 450 degrees Fahrenheit or minus 232 Celsius. It is this heat that comes out of the water and the heel to reach the freezing point at a temperature of about 41 degrees Fahrenheit or 5 degrees Celsius.

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With this technology, ancient Persian and Middle Eastern peoples can pour water into ponds of 30 to 60 centimetres in depth. After that, they will wait for the freezing process and return to the pool before sunrise.

That’s when the process of ‘harvesting’ ice is then stored in a place called yakhcal or ice hole. This place is a dome-shaped and insulated dome that can store ice in stable temperature for months.

“The water pool will send heat to the atmosphere, this concept is called thermal radiation, and the atmosphere and molecules in it absorb heat and send it back, but this atmosphere does not absorb all that heat,” says University of Pennsylvania physicist Aaswath Raman.

“So the heat” runs away “into the sky, so the water in the pool sends a greater amount of heat to the sky than the sky sends the heat back into the water, so the pool can freeze.”

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Raman confirmed the ancient technology is actually applicable in the modern era as now. All that needs to be done is to find a way to apply the basic principles of thermal radiation in the construction of infrastructure, roofing systems and roof panels. So reported Real Real Science, Monday (9/7).

During the day, the roof will send heat to the sky. The park explains that this heat can reduce electricity usage in modern cooling systems that account for 17 per cent of worldwide electricity use.

image source: Pixabay


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