(Solved): T=370 In a throttling valve, water vapor enters a valve with a mass flow rate of 2kg/s at a tem ...

T=370

In a throttling valve, water vapor enters a valve with a mass flow rate of $2\mathrm{kg}/\mathrm{s}$ at a temperature of $T$ (where; $T=300+$ Last 2 digits of Student ID Number in ${}^{?}\mathrm{C}$ ) and a pressure of 60 bar and undergoes a throttling process to 40 bar. (a) Sketch the schematic diagram. (b) Determine the flow exergy rates at the valve inlet and exit and the rate of exergy destruction, each in $\mathrm{kW}$. (c) Evaluating exergy at 8.5 cents per kW ? h, determine the annual cost, in $\$/y$ ear, associated with the exergy destruction, assuming 8400 hours of operation annually. Let ${\mathrm{T}}_0=258\mathrm{C},{\mathrm{p}}_0=1$ bar.