Consider a Heat Conversion System exchanging the heats Q$0,$ Q$1$ and Q$2$ at the three temperature levels, T$0,$ T$1$ and T$2($T$0$ Ta $>$ T$0,$ identify if the HCS is a heat$-$driven refrigerator, a heat$-$driven heat pump for heating or a heat pump for heating and cooling. b$)$ Obtain the equation for the COP $($defined as the ratio of useful output and driving energy input$)$ as a function of T$0,$ T$1$ and T$2$ for reversible operation. C$)$ Take T$0=260$ K$,$ T$1=380$ K and T$2=400$ K$,$ to determine the values for the COP $.$ D$)$ if the actual COP of a HCS operating at same temperature levelss is $0\mathrm{.}9,$ what is its second law efficiency $\backslash$eta eff in $\%?$

Solution: COP$=$Answer $1$ Question $2$ ; $\backslash$eta eff$=$Answer $2$ Question $2$