Standard numerical designations facilitate refrigerant identification. Ammonia, a prevalent natural refrigerant in industrial applications such as cold storages and ice plants, is assigned the number R-717. Tetrafluoroethane, identified as R-134 (R-134a), is utilized in domestic refrigerators and automotive air conditioning systems. Water, designated as R-718, finds application as a refrigerant in specialized scenarios. Difluoroethane, known as R-152 (R-152a), is employed as a low-pressure refrigerant. Consequently, ammonia is accurately classified as R-717.