Question

NGINEERI 13. A centrifugal compressor (not a piston type) compresses the air from the ambient condition at T, 300K and Pi 1 bar to P 10 bar following three different, standalone paths: isentropic, reversible isothermal, and an irreversible adiabatic process, respectively. (Note: These processes are not sequential processes; rather each of them is an independent, standalone p They all start at the same initial condition at state 1, but they end at different state 2.) The mass flow rate is m 2 kgls actual process has an isentropic compressor efficiency n 0.8. The effects of both kinetic and potential energy are neglig The air can be treated as an ideal gas and the specific heat ratio (k) of the air is 1.4. Use subscripts "s" for isothermal, and "a" for actual adiabatic process; i.e. , the state 2 should be labeled as 2s, 2i, or 2a, respectably. The subscripts must be clearly labeled. Heavy penalties will be levied if the subscripts are not clearly labeled (a) Qualitatively plot the irreversible adiabatic, reversible isothermal, and isentropic processes togethe negligible. ic, "i" for diagrams. wo different methods can be used to calculate the isentropic work. Use them and compare their difference. (c) Determine the heat and the work of the reversible isothermal process. (d) Determine the heat transfer, the work, the entropy production and the Exergetic (or the second law) efficiency of the adiabatic process. (40%) irreversible

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