The lithium bromide absorption chiller was successfully developed in 1945. It can utilize low temperature heat energy and high thermal coefficient (single stage thermal coefficient is about 0.7), so it develops rapidly and has been widely used in some countries. In terms of air conditioning and so on. There are many types of lithium bromide absorption chillers, such as a two-stage lithium bromide absorption chiller, which can effectively utilize high-pressure heating steam; a two-stage absorbing lithium bromide absorption chiller, which can effectively utilize low-temperature heat energy; The lithium-ion bromide absorption chiller can be directly heated by combustion of oil or gas. The lithium bromide absorption chiller can also be combined with a back pressure steam turbine to utilize the steam exhaust of the steam turbine as the heating steam of the lithium bromide absorption chiller, which not only improves the utilization of water vapor, but also satisfies several requirements, for example Refrigeration and power generation. According to this idea, a refrigeration unit in which a lithium bromide absorption chiller and a centrifugal freon chiller work together has been designed. It directly drives the centrifugal compressor with a back pressure turbine and uses its exhaust steam to heat the lithium bromide absorption chiller. This unit can produce a large amount of cold, and can also produce cold at different evaporation temperatures. This type of unit is not only economical (low steam consumption rate), but also has good low-load characteristics, that is, it can maintain high economic efficiency even under partial load.
       In the 1950s, Carrier's invention of lithium bromide absorption refrigeration technology was not immediately promoted. (At that time, electricity and energy in the United States were not in short supply. The global failure of Freon refrigerant to destroy the Earth's atmospheric ozone layer has not received sufficient attention.) research Development. Japanese manufacturers have developed vigorously after introducing lithium bromide technology. Companies such as Sugawara, Hitachi, Mitsubishi Heavy Industries, and Kawasaki Heavy Industries have formed mature and stable technologies. At present, lithium bromide units in Japan account for about 90% of the mainframe market.
       In 1982 (perhaps in 1981), the inventor of lithium bromide unit technology, Carrier, in turn purchased lithium bromide technology from Ebara, and US companies including York and Trane also purchased lithium bromide unit technology from Japanese manufacturers.
       In 1982, Mr. Takayuki Takashi, the chief engineer of Ebara, published the book "Absorption Refrigerator", which was translated into various languages by various countries and led the development of the world's absorption air conditioner industry.