Experimental Analysis of Alternative Refrigerant as Replacement of Hfc134a

An experimental performance study on VCR system with 100g R600a/R290 refrigerant mixture and 100g R600a (pure isobutene) as drop in replacement of R134a was conducted . continuation running tests were performed under different length of capillary for R600a/R290 & R600a. The result showed that the hydrocarbon mixture (R600a/R290) had highest COP at L=10 feet length capillary by17.35% -23.5% for 5 0 C to -5 0 C evaporating temperature. Pull down time also lesser for R600a/R290 mixture than R600a pure isobutene. Refrigeration effect of R290/R600a (60/40 by wt%) mixture was higher in the range 20% -26.76% than R600a for L=10 feet length capillary. In this system capillary of L1=10 feet, L2=11 feet, L3=12 feet length were tested and the results are best for L=10 feet length. The overall performance has proved that the100g R600a/R290 (60/40 by wt%) with 10feet length capillary could be the best long term alternative refrigerant to phase out R134a.