Steam enters a turbine with a pressure of 80 bar, a temperature of 480°C, and a velocity of 145 m/s. Saturated vapor at 120°C exits with a velocity of 87 m/s. At steady state, the turbine develops work equal to 610 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Determine the rate at which entropy is produced within the turbine per kg of steam flowing, in kJ/kg K. Neglect the change in potential energy between inlet and exit.

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Q: Question attached

A: Solution    First, take the properties from the given table             h2=417.46+0.92676=2826 kJkg

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.