• Salman Ahmed Khan
• D.C Vishwakarma

R134a is widely used and considered as an environmentally safe refrigerant and more suitable refrigerant for domestic refrigerators. It is safer to ozone layer but it has a high GWP (Global Warming Potential). The Kyoto Protocol of the United Nations Framework Convention on Climate Change (UNFCCC) asked for reduction in emission of six categories of greenhouse gases, including R134a, used as refrigerant in domestic refrigerators. Therefore, according to Kyoto protocol the consumption of R134a must be seriously reduced. From the environmental and ecological points of view, it is urgent to find some better substitutes for high global warming refrigerant. The European Union Regulations section 517 of 2014 has been recently approved in a further attempt to curb the effects of global warming. As a consequence, the refrigerants manufacturing sector is moving towards alternative refrigerants with a low Global Warming Potential (GWP) in accordance with the limit fixed by these regulations (150). Many researchers tested hydrocarbons refrigerant mixtures as alternatives to R134a in domestic refrigerators due to its good thermodynamic and thermo-physical properties compared to R134a. However, HC refrigerants have their own drawbacks with respect to flammability and temperature glide. Another possible alternative to R134a in domestic refrigerators is R440A, with low GWP of 144. The refrigerant mixture composed of R440A and R600a in the ratio of 76:24, by mass has been developed and designated as R429A by ASHRAE. It is a near azeotropic with temperature glide of 0.2°C and low GWP of 107 and considered as a viable alternative to R134a. In this research work, the performance of the domestic refrigeration system with the following refrigerants has been investigated experimentally as a retrofit for R134a. 1. R440A which is a mixture of R-290/134a/152a (.6±.1/1.6±.6/97.8±.5) - ODP = 0, GWP = 144. 2. R429A which is a mixture of R-E170/152a/600a (60±1/10±1/30±1) ODP = 0, GWP = 13.9 R440A and R429A by using CYCLE_D Software to predict the different performance characters. The experimental investigations were carried out in a domestic refrigerator of Kelvinator make with 169 liter capacity which was originally manufactured to work with R134a. This refrigerator was equipped with necessary sensors and instrumentations for experimental investigations. The results of the present investigation have proved that the selected alternative refrigerants R440A, R429A are the excellent substitutes for R134a. In conclusion, the proposed refrigerants seem to be a long term refrigerant to replace R134a from the viewpoint of eco-friendly refrigerants with zero ODP and low GWP values. It also has better performance than R134a requiring minimal changes in the existing refrigerators. contains.

R114, R600a, R236fa, COP, R429A, GWP

"IN DOMESTIC REFRIGERATOR INVESTIGATE THE PERFORMANCE BY USING R440A AND R429A AS AN ALTERNATIVE TO 134A", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.520-525, May-2019, Available :http://www.jetir.org/papers/JETIR1905277.pdf

"IN DOMESTIC REFRIGERATOR INVESTIGATE THE PERFORMANCE BY USING R440A AND R429A AS AN ALTERNATIVE TO 134A", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp520-525, May-2019, Available at : http://www.jetir.org/papers/JETIR1905277.pdf