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A comparative experimental investigation on the effect of superheating of R‐22, R‐404A, R‐407C, and R‐422A as low‐temperature refrigerant blends on the performance of a vapor compression refrigeration system is conducted. Empty and porous evaporators with porosities of (40%, 43%, and 45%) are used during the tests, to predict good alternatives to t...
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Citations
... Mohammad et. Al. [2,3], a comparative experimental investment of the effect of superheating degree of compressor on refrigerant system performance using low temperature different refrigerant in blends in porous media. The percentages of increase in evaporation capacities of R-422A and R-404A when compared with R-22 under the same conditions are 18.6% and 8.8%, respectively, while the percentages of increase in COP when compared with R-22 are 17% and 12%, respectively. ...
... Tarawneh concluded from this experimental performance study of the heat transfer behavior of different refrigerant blends that the refrigerant R422A has a heat transfer performance better than that of the refrigerant R404A in all of the experimental tests. Tarawneh et al. [15] investigated the effect of super-heating of different low-temperature refrigerant blends on the performance of a refrigeration system using porous evaporators. They concluded that, the coefficient of performance as well as the refrigeration capacity of the analysed refrigeration system, showed a reasonable increase when using porous evaporators. ...
The effect of using porous sub-cooler on the performance of a refrigeration system using the refrigerant R422A as case study was experimentally investigated. The variations of refrigeration capacity, coefficient of performance, relative capacity index, power consumption per ton of refrigeration and pressure drop with degree of sub-cooling and internal sub-cooler porosity were studied. Results showed that the refrigeration capacity, coefficient of performance and relative capacity index can be improved by increasing degree of subcooling and decreasing the porosity of the internal sub-cooler with average percentages of increase of 38.5%, 48% and 58%, respectively. The refrigerant R422A exhibited low power consumption per ton of refrigeration when using porous internal sub-cooler. Effects of internal sub-cooler effectiveness and pressure drop on the performance of the refrigeration system were also studied. An average percent decrease of about 9.5%, of power consumption per ton of refrigeration was recorded by decreasing porosity from 43% to 40%.
