Liquid vaporization refrigeration uses the heat absorption during liquid vaporization and the exothermic effect during condensation to achieve refrigeration. The liquid vaporizes to form steam. When the liquid (refrigerating medium) is in a closed container, in addition to the liquid and the vapor generated by the liquid itself, there is no other gas in the container. The liquid and vapor will reach equilibrium at a certain pressure. Gas is called saturated steam, pressure is called saturation pressure, and temperature is called saturation temperature.
During equilibrium, the liquid no longer vaporizes. At this time, if a part of the vapor is pumped out of the container, the liquid must continue to vaporize to produce a part of the vapor to maintain this balance. Wall-mounted split air conditioners absorb heat when liquid is vaporized, and this heat is called latent heat of vaporization.
