How did the earliest air conditioner come into being?

1881March U.S president Garfield was shot dead at Washington station in July. Although it is not fatal, because the bullet went deep into the spine, the injury was very serious and his life was dying. The bullet must be removed by surgery immediately. Gefield's hospitalization dramatically promoted the emergence of air conditioning.

The summer in Washington is sultry, especially this year, there has been a rare high temperature in history. The president in the hospital bed is very weak. Although the president's wife has been using a fan to fan him, it doesn't help at such a high temperature. The president's wife asked to lower the room temperature. So, this task fell to a mine technician named Dorset. He knows how to send gas into the mine tunnel. After many experiments, he finally succeeded in reducing the indoor temperature from 30 degrees Celsius to about 25 degrees Celsius. According to the principle that compressed air will release heat and absorb heat when it returns to normal, Dorsey finally installed a compressed air conditioner in the presidential ward after repeated experiments. As a result, the room temperature dropped by 7 degrees Celsius, so the world's first air conditioner was born.

In fact, the real air conditioner was invented by the American inventor Wales Carrier. Although the air conditioner invented by Dorsey reduced the temperature of the air, it was still humid. How can we dry the air? Carrier, a mechanical engineer in a heating company, has been thinking about this problem. The foggy railway station inspired him that the "humid" air containing saturated water is actually dry. The so-called fog is the saturated state when the air approaches the temperature of 100%. If the air is saturated and its temperature is controlled at the same time, we can get an air whose temperature can be controlled quantitatively. So in 1902, he installed a historic temperature "regulator", thus obtaining the patent of air conditioning. This air conditioner was originally installed in a printing factory in new york. 1906, carrier's "air processor" was patented again, and the air conditioner was further improved. The improved air conditioner began to be adopted by textile mills, which gradually became popular.

At the end of 1930s, Carrier made a breakthrough in ducted air control system. High-rise buildings are not only equipped with air conditioning, but also do not need to occupy valuable office space. However, due to the high cost and unreliability of household air conditioners, Carrier failed to invest in the household air conditioner market. It was not until the 1950s that two other American companies, Tongyou Electric and Westinghouse Electric, realized the idea of "home improvement air conditioning" in Carrier, making small air conditioners enter thousands of households and become pets of people suffering from the heat.