Using The Strange Property Of Water To Advantage
Most people, except perhaps those, who live in hot climates, know from their personal experience that ice floats on water. But most people don’t know that water is at its densest at 4°C. So water at this temperature sinks, but it rises at all others.
I once heard somebody use the existence of this property as a reason why God exists. He argued that if it didn’t, then life would have been impossible in water. It was all a bit contrived, but it is still as a strange property.
This morning, I was listening to Wake Up To Money, when a company called SureChill was mentioned. So I looked them up and found that they are using this property to create a new type of refrigerator. This page explains it all. This section describes the solution.
Sure Chill is a brand new kind of cooling system. It doesn’t need a constant power source. In an on-grid situation with intermittent power, it works perfectly well. In an off-grid situation, where a solar panel may be used, a Sure Chill powered refrigerator doesn’t even need a rechargeable battery. It shouldn’t work but it does. And it works beautifully.
Water surrounds a Sure Chill refrigeration compartment. When it has power, the water cools and forms ice above the compartment leaving only water at four degrees cooling the contents. When the power is switched off, the water warms and rises while the ice begins to melt, keeping only four-degree water cooling the contents of the compartment. So it has its own internal and entirely natural energy store that maintains a completely steady temperature. The system can operate like this, without power, for days and weeks.
People think physics is boring. Outside of Metier, I’ve done well in my career and made quite a bit of money by understanding the laws of physics that govern our lives.
My surprise at this idea, is that the technique could have been implemented in a refrigeration system decades ago. Artificial refrigeration was first performed by William Cullen in 1755. My bible; Nelkon amd Parker says that the maximum density of water was first measured by Thomas Charles Hope in 1804.
That is a long time from experimental proof to reality!
The Anonymous Widower 
Very interesting. I remember cooling systems on the farms when I was a child where water dripped over charcoal. These containers stood outside in all weathers and I think were used for butter, cream and milk.
Comment by Candy Blackham | November 21, 2014 |
That’s evaporative cooling. Have you seen an earthenware wine coioler?
Comment by AnonW | November 21, 2014 |