The technology of solution temperature and humidity regulation, as well as the air conditioning systems using this technology, has a long history internationally. In the mid-1930s, Europe and the United States began using solution dehumidification technology, and there were also professional articles introducing lithium chloride solution dehumidification technology in China during the early years of the revolution. In addition, it was widely applied in the tunnels and underground engineering projects in the southwest region, effectively solving the dehumidification problem in underground buildings.
