Abstract
Experiments were carried out initially by considering pure R134a and hydrocarbon refrigerant mixtures such as (R290/R600a) (HCM1 44/56, HCM2 50/50, HCM3 54/46, HCM4 64/36, and HCM5 74/26 wt %). Tests are conducted at the atmospheric temperature of 30°C in a domestic refrigerator system. The performance parameters such as pull-down time, desired effect, power consumption, and running cost of the system are to be analysed at different evaporator temperatures, the mass of refrigerant and varying length of capillary tubes. To evaluate the refrigeration effect, Power consumption and COP of the domestic refrigerator at various freezer temperatures (–9°C, –12°C & –15°C) were selected. Results report that out of all the alternative mixtures the amount of energy input was less consumed in the case of HCM1 at a minimal expansion length of 6.3 mm. In the case of HCM5, the least energy was consumed at a capillary length of 5.24 mm whereas in the case of R134a it was at 3.3 mm.
Highlights
Refrigerant R134a is considered environmentally safe and is virtually non-toxic (1993), but its Global Warming Potential is very high (1300)
Out of all the variety of mixtures, larger quantity of energy input is observed in the case of HCM1 and the least is observed in the case of HCM5
The desired effect is observed to be greater in the case of HCM1 to HCM4 and decrease due to the length of the capillary is more for HCM5
Summary
Refrigerant R134a is considered environmentally safe and is virtually non-toxic (1993), but its Global Warming Potential is very high (1300). Somchai Wongwises et al [2] have carried out an experimental analysis on vapour compression refrigeration systems with different hydrocarbon substitutes as a replacement of R134a. M.A. Sattar et al [4] has carried out the analysis to study the performance of refrigeration system with different working fluids and compare it with R134a. The results reported that the refrigierants considered for the analysis has been consumed lesser energy input, optimal pull-down time with higher COP than compared to R134a. The results reported that zeotropic mixture shows better-desired effect with lesser energy input and higher COP. The impact of sink temperature with R134a and R290/R600a as the refrigerants were experimentally studied to evaluate energy efficiency ratio, COP, and efficiency defect in different components of the refrigeration system. Comparison among the investigated refrigerants confirmed that R152a and R134a have approximately the same performance, but the best performance was obtained from the use of R152a in the system
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