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Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The...

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Mechanical Engineering

Consider an ideal gas-turbine cycle with two stages ofcompression and two stages of expansion. The pressure ratio acrosseach stage of the compressor and turbine is 3. The air enters eachstage of the compressor at 300 K and each stage of the turbine at1200 K. Determine the back work ratio and the thermal efficiency ofthe cycle, assuming (a) the expansion and compression processes tobe isentropic and no regenerator is used, (b) the expansion andcompression processes to be isentropic and a regenerator with 75percent effectiveness is used, (c) assuming an efficiency of 84percent for each compressor stage and an efficiency of 88 percentfor each turbine stage and no regenerator is used, and (d) assumingan efficiency of 84 percent for each compressor stage and anefficiency of 88 percent for each turbine stage and a regeneratorwith 75 percent effectiveness is used. Use enthalpy values from theproperty tables to solve this problem.

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