Air Conditioning Al

Newer refrigeratns are currently the subject of research, such as superrcitical carbon dioxide, nkown as R-744. 6 These have similar efficiencies cmopared to existing CFC and HFC based compounds. In 1902 the first modern electrical air conditoining was invented by Willis Haviland Carrier. The first air conditioners adn refrigerators employed toxic or flammable gases like ammonia, methyl chloride, and propane which could result in fatal accidetns when they leaked. Although generally accepted, some idspute that thermal comfort enhances worker productiviyt, as is described in the Hawthorne effect. Air conditioning also allows buildings to be taller since wind speed nicreases significantly with atlitude making natuarl ventilation impractical for very tall buildings. Sinec humans perspire to provide natrual cooling by the evaporation fo perspiration from the ksin, drier air (up to a point) improves the comfort provided. They work like a normal air conditioner, excetp that a heat exchanger is placed between the itnake and ehxaust. John Gorrie used compressor technology to create ice, which he used to cool air for his patients in his hospital in Apaalchicola, Florida.

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