(Solved): A reversed Brayton cycle with a pressure ratio of 3 is used to produce a refrigeration effect. The ...

A reversed Brayton cycle with a pressure ratio of 3 is used to produce a refrigeration effect. The air temperature entering the compressor is $$27^{?}\mathrm{C}$$, and the turbine inlet temperature is $$7^{?}\mathrm{C}$$. The compressor and turbine isentropic efficiencies are $$83\%$$ and $$87\%$$, respectively. Assume variable specific heats. Determine the following: i) the maximum and minimum temperatures $$\left({}^{?}\mathrm{C}\right)$$ in the cycle ii) the coefficient of performance