Experimental Research with the Replacing Fluids In the Household Refrigerator

The experimental investigation of applying refrigerant Rl52a and zeotropes RI52al R22, Rl52al R221 Rl 14 to replacing refrigerant Rl2 is reported in this paper. The operating characteristics have been gotten using R 12, R I S2a, R ISia I R22 and R I 52a I R22 I R I 14 in the household refrigerator. The experimental results have been analysed. It is known that the·energy consumption of the refrigerator with R152a is about JOo/. lower than that with Rl2, and that with R12 is basically the same as that with R 152a I R22. The results also show that the freezing level of the mixture Rl52al R221 Rll4 is basically the same as that of RI2, the energy consumption of Rl52al R22 I Rl14 is approximately 3% lower than that ofRI2 .. INTRODUCfiON R 12 is widely used in small-sized refrigeration system {i.e. domestic refrigerators), for its good pcrfonnance and low price. But, recently, scientists discovered that R12 seriously depletes the ozone layer of the atmosphere, it cannot be accepted by environment, and it has been listed at one of substances restricted. Under.existing conditions, it is a convient and feasible way to substitute refrigerants used for Rl2. CHOICE OF THE REPLACEMENT The perfect replacement should have better properties of physics, chemistry and thennodynamic; and be safe and economic, its RODP's {i.e. Relative Ozone Depletion Potential) and ROE's (i.e. Relative Greenhouse Effect) values should be as small as possible. Furthermore, in order. to apply existing refrigeration installations to the utmost extent and not to make new technical problems in manufacturing engineering, it is expected that properties of the replacinz fluid, for example, thermodynamic and physics properties, such as critical parameters, the compressor factor, the freezing temperature, the boiling point, the latent heat, the volumetric refrigeration capacity, the dynamic viscosity, the density, the heat conductor, the electric insulation and so on, ought to be similar to properties of the refrigerant replaced. Both the COP of cycles and the discharge temperature of compressors arc also important criterion for the replacing fluid. Because it needs longer time to develop and research new refrigerants, we best choose the replacement from existing refrigerants. Thus, we pay our attention to refrigerants whose properties