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An adiabatic turbine operates at steady state. Air enters the turbine at a pressure and temperature...

An adiabatic turbine operates at steady state. Air enters the turbine at a pressure and temperature of 800 kPa and 1100 K, respectively, and exits at 100 kPa. A temperature sensor at the turbine exit indicates that the exit air temperature is 700 K. Kinetic and potential energy effects are negligible, and the air can be treated as an ideal gas. Determine if the exit temperature reading can be correct. If yes, determine the turbine isentropic efficiency.

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For maximum work done, the heat loss from the turbine must be zero during the expansiorn cess. This process is an isentropic process The relation between pressure and temperature is -1 2s 0.4 100 14 2s 1100 800 125-607.25 K The given exit temperature is 700 K, which is greater than 607.25 K. Therefore, the process is possible The isentropic efficiency is It = 100 c,G-5)×100 1100 K-700 K 1100 K-607.25 K x100 =0.8118×100 81.77% The isentropic efficiency is 81.77%

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