Thermodynamic investigations On three stage auto refrigerating Cascade system using eco friendly Refrigerants

Abstract

In 1956 G M B Dobson measured the Ozone level in the Arctic newlineregion as 320 DU Dobson units and it was below 150DU during spring time newlinewhen compared to the normal level of 450DU which was an unknown newlinephenomenon and was named as ozone hole Before the harmful effect on the newlineozone layer was identified in 1974 by Frank Sherwood Rowland and his newlinepostdoctoral associate Mario J Molina in comparison with Nitric Oxide newlineproduced by soil bacteria through the production of NO2 the CFC s lead the newlineworld of refrigeration industries for over 6 decades newlineIn the early 1980 s scientists have identified the steady decline of newlineabout 4 per decade in the total volume of ozone in Earth s stratosphere newline the ozone layer which is known as ozone depletion and a much larger newlinespringtime decrease in stratospheric ozone These components greatly newlinecontributed towards global warming and also quantified it as 8500 times more newlinethan that of CO2 over a hundred years These findings kindled the interest of newlineHVAC engineers on production and the usage of HFC and HC refrigerants newlineand also the ban on CFC s HCFC s as the Montreal protocol agreement on newline16th September 1987 was implemented on 1st January 1989 newline newline