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The History of Evaporative Air Coolers ---- Part Two
It is said that the invention of air cooler is related to Benjamin Franklin, who found out the evaporative cooling truth for the first time. July of 1750 was a scorching month in Philadelphia and the air temperature reached 100 degrees Fahrenheit. Benjamin was reading and writing in his study, the doors and windows were all open, a brisk wind was blowing through the room from time to time. Benjamin’s shirt was damp completely because of sweating all the time. Then, he took off it and changed to a dry one, but he felt warm and uncomfortable with the dry shirt, which seemed to have been near a fire, compared to the wet one he had just removed.
He was very curious about the phenomenon. Meanwhile, he realized that it was not the hot air blowing through his room that cooled off him but the perspiration evaporating that made him feel cool. Later,in order to find out the truth, Benjamin tried some experiments. He wetted the bulb of a thermometer with some spirits that evaporated more quickly than water, and then blew air across it. He managed to bring down the temperature.
By some experiments, he summed up the points and drew a conclusion---- evaporative cooling. “Liquid evaporates by shedding molecules into the air, changing from a liquid state to a gas. As they become suspended in the air, the molecules draw some of the heat from the hotter air, cooling it down as the water and air find equilibrium. The process also cools the remaining liquid, as hotter, faster-moving molecules are the most likely to escape into the air.”
Nowadays, evaporative air coolers are working right based on this simple principle---- water evaporation cooling.
