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Question: 11 a frictionless pistoncylinder device initially contains 001 m2 of...

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11. A frictionless piston-cylinder device initially contains 0.01 m2 of air at 400 K and 350 kPa. Heat is now transferred to air from a furnace at 1200 K, and the air expands isothermally until its volume is doubled. No heat transfer takes place between the air and the surrounding atmospheric air, which is at 300 K and 100 kPa. Determine: a) the useful work output (exergylavailability transfer accompanying work) in kJ (4 points) b) the exergy (availability) transfer accompanying heat in kJ (4 points) c) the exergy (availability) change in kJ (5 points) and d) the exergy destroyed for this process in kJ. (5 points)
m . A closed feedwater heater (basically a heat exchanger) heats 20 kg/s of water from 100 C, 20 MPa to 250 C, 20 MPa. The extraction steam from the turbine enters the heater at 4MPa, 00C and leaves as saturated liquid. (a) What is the required mass flow rate of the extraction steam? (7 points) (b) Also, estimate the rate of entropy generation in kW/K. (7 points)
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