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Wk_7_Recitation_Draft__10_22_ - b What would the...

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Topics: Property Relationships and Entropy Important Concepts TdS equations Retrieving S data from tables. Ideal Gas model and Entropy Entropy balance Entropy, heat and T-s diagrams Isentropic processes Isentropic efficiency Recitation #1 Nitrogen (N 2 ) at 3.8 atm and 170°C enters an insulated turbine operating at steady state and expands to 1 atm. If the isentropic turbine efficiency is 83.2%, determine the temperature at the turbine exit, in °C, using the ideal gas model for the nitrogen and ignoring kinetic and potential energy changes. Recitation #2 Steam enters an insulated turbine at 1 MPa and 640 ° C and exits at 60 kPa and 200 ° C. a) Calculate the work done by the turbine per kg of steam.
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Unformatted text preview: b) What would the temperature of the turbine exhaust be if the turbine processes were isentropic and the exit pressure was 60 kPa? c) Calculate the isentropic efficiency of the turbine. Recitation #3 Carbon-steel balls ( ρ =7833 kg/m 3 and C p = 0.465 kJ/(kg ° C)) 8 mm in diameter are annealed by heating to 900 ° C in a furnace and then allowing them to cool slowly to 100 ° C in ambient air at 35 ° C. If 2500 balls are to be annealed per hour, determine (a) the rate of heat transfer from the balls to the air and (b) the rate of entropy generation due to heat loss from the balls to the air. (Ans.: 542 W and 0.986 W/K)....
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