Close Loop Limit Sensor
Close Loop Limit Sensor Refrigerant development The first air conditioners and refrigerators used toxic gases such as ammonia and methyl chloride. Such a gas leak can cause a major accident. Thomas Mikkeli invented the chlorofluorocarbon gas in 1928 and named it Freon. This refrigerant is much...
Close Loop Limit Sensor
The first air conditioners and refrigerators used toxic gases such as ammonia and methyl chloride. Such a gas leak can cause a major accident. Thomas Mikkeli invented the chlorofluorocarbon gas in 1928 and named it Freon. This refrigerant is much safer for humans but harmful to the atmospheric ozone layer. Freon is a trademark of DuPont CFC, HCFC or HFC refrigerants, each of which also includes a number to indicate the molecular composition of its constituents (eg R-11, R-12, R-22, R- 134). Among them, the most widely used R-22 HCFC refrigerant in the field of direct evaporative moderate cooling products will be discontinued in new production equipment in 2010 and will be completely discontinued in 2020. R-11 and R-12 have been discontinued in the United States. As an alternative, some refrigerants that are harmless to the ozone layer have been put into use, including the refrigerant R-410A under the trade name "Puron". R290 and R32 new environmentally friendly refrigerants are also gradually coming to market. R290 contains only carbon and hydrogen, does not contain chlorine and fluorine, and has zero ozone depletion potential (ODP).
But when it comes to air conditioning, it is popular, mainly through cinemas. Most Americans are exposed to air conditioning for the first time in a movie theater. The cinemas of the 1920s used air-conditioning technology to promise to provide cool air to the audience, making the air-conditioner as attractive as the movie itself, and the summer season replaced the winter season of watching movies. A large number of indoor entertainment venues, such as casinos, indoor sports courts and shopping malls, which were open all year round, were attributed to the emergence of air conditioners.
In the 1960s and 1970s, rare dry weather occurred in the United States. In order to solve the problem of air-conditioning cold and heat sources in drought-deficient areas, the United States took the lead in developing air-cooled chillers and replacing the cooling towers with air cooling. The English name is :Air Cool Chiller, referred to as Chiller!