OR

a$)$ A two$-$stage compression machine with a flash intercooler is to produce $25$ ton of refrigeration while working between $-30C$ and $42C.$ The pressure in the flash Intercooler is the geometric mean of the upper and lower pressure limits$.$ Sketch the system$($flow diagram and cycle on the p$-$h diagram giving relevant property values. The enthalpy at the end of LP compressor is $195k\frac{J}{k}g$ and that of H$.$P$.$ compressor $211\mathrm{.}1k\frac{J}{k}g.$ The working medium is $R-12.$ Find $($a$)$ COP, $($b$)$ power, $($c$)$ fluid flows through LP and HP compressors and $($d$)$ volume handled by LP compressor.