Performance Of Window Air Conditioner Using Alternative Refrigerants With Different Configurations Of Capillary Tube

The objective of this study is to present test results on the basis of experimental data of capillary tubes for R-22 and its alternative R-410A (R-32/125, 50/50 wt.%).Three capillary tubes with different length (500mm, 900mm, and 1500 mm) and inner diameter (1.3mm, 1.4mm, and 1.6mm respectively) were selected as test sections. Compressor work, heat rejected in the condenser, coefficient of performance (COP) and mass flow rate through capillary tubes were calculated for several ambient temperature. Compressor work, heat rejected in the condenser, coefficient of performance (COP) and mass flow rate of R-410A were compared with R-22 for the same test conditions. The results of single capillary tubes were also compared with the results of combination of two capillary tubes. The air-conditioner was 1 TR unit designed for R-22 and R410A. The performance of the air-conditioner with R-410A was compared with the baseline performance of the air-conditioner with R-22.The experiment result shows that (1) the coefficient of performance (COP) for R-410A is lowers than R-22. And the mass flow rate, heat rejected in the condenser and compressor work done for R-410A are higher than R-22 for all capillary tubes. (2)For this experiment the combination of two capillary tubes with inner diameter of 1.4mm and length 900 mm has higher coefficient of performance (COP) than single capillary tubes with inner diameter of 1.3 mm, 1.6 mm and length 500 mm, 1500 mm respectively.(3) The coefficient of performance (COP) of capillary tube with inner diameter of 1.6 mm and length 1500 mm is higher than the capillary tube with inner diameter of 1.3 mm and length 500 mm.(4) For R-22, the coefficient of performance (COP) of combination of two capillary tubes with inner diameter of 1.4mm and length 900 mm is 17.10 % higher than the straight capillary tube with inner diameter of 1.3 mm and length 500 mm. And 13.07 % higher than the straight capillary tube with inner diameter of 1.6 mm and length 1500 mm at 40ºC ambient temperature. (5)And for R- 410A, the coefficient of performance (COP) of combination of two capillary tubes with inner diameter of 1.4mm and length 900 mm is 13.00 % higher than the straight capillary tube with inner diameter of 1.3 mm and length 500 mm. And 11.15% higher than the straight capillary tube with inner diameter of 1.6 mm and length1500 mm at 40ºC ambient temperature.