Kitchen refrigerator display cabinet

In 1873, Carl von Linde, a German chemist and engineer, invented a refrigerator that used ammonia as a refrigerant. Linde used a small steam engine to drive the compression system, which subjected ammonia to repeated compression and evaporation, resulting in refrigeration. Linde first used his invention to design and manufacture industrial refrigerators at the Sedumar brewery in wiesbaden. Later, he improved the industrial refrigerator. In 1879, the world's artificially cooled household refrigerators were miniaturized. The steam-powered refrigerator was soon put into production, and by 1891 it had sold 12,000 units in Germany and the United States.

In 1923 Swedish engineers blyton and montes invented a refrigerator that used an electric motor to drive a compressor. Later, an American company bought their patent and produced a household refrigerator in 1925. The original refrigerator had separate electric compressors and freezers, usually kept in a home kiln or storeroom, connected by pipes to the electric compressors and then combined into one. Before the 1930s, most refrigerants used in refrigerators were unsafe, such as ethyl ether, ammonia, sulfuric acid, or flammable, corrosive or irritating. Later, I started looking for safer refrigerants and found freon. Freon is a non - toxic, non - corrosive, non - flammable fluorine compound. It has rapidly become a refrigerant in a variety of refrigeration equipment and has been used for more than 50 years. However, freon has been found to have a devastating effect on the ozone layer in the earth's atmosphere. So people began to look for new and better refrigerants.