① Cogo leo. Secundum munus compressoris, pressio refrigerandi augetur ad cognoscendam cycli refrigerationem. Secundum genus refrigerandi, potest dividi in compressionem vaporum refrigerationem (ex evaporatione hydrau refrigerationis, refrigerans periodicum gas-liquidum tempus mutationis habebit) et compressio gasi armarium (subnixa in summo pressura gasi expansionis refrigerationis, refrigerans semper in statu gasse), Vapor compressio refrigeratio late usus est moderno leo. ②Effusio leo.Secundum munus absorbentis generantis coetus (compressoris thermochemici), refrigerationis cycli dividi potest in absorptionem generis ammoniaci, effusio lithium bromide genus et effusio generis diffusionis. ③ Steam jet leo. Circulus refrigerationis perficitur per actionem vaporis eiectoris (jet compressoris). £ Semiconductor frigidior. Effectus scelerisque electrici semiconductoris adhibitus est ad facultatem refrigerandi.

The main performance indexes of the refrigerator include working temperature (evaporation temperature and condensation temperature for vapor compression refrigerator, temperature of cooled object and temperature of cooling medium for gas compression refrigerator and semiconductor refrigerator), refrigerating capacity (heat removed from cooled object by refrigerator per unit time), power or heat consumption and refrigeration coefficient (the index to measure the economy of compression refrigerator refers to the cooling capacity obtained by consuming unit work) and thermodynamic coefficient (the index to measure the economy of absorption and steam injection refrigerator refers to the cooling capacity obtained by consuming unit heat), etc.