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17. The tank shown below initially contains 0.7 lbm of N2 at 950 °R and an adiabatic, weightless, volumeless, and frictionless piston. The 7 ft3 tank is connected to a source of air at 950 c'R and 100 psia. Air enters the tank, forcing the piston up, until the air temperature is 1000 °R and the final mass ofair is 0.35 lbm. Calculate the total entropy generation for the process (Btulc'R) assuming that there is 8 Btu of heat transfer from the M2 to the surroundings at 80 °F. SEEN = 00252—1"
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Solution: Apply the conservation of energy on the mixture chamber. NOTE: The given value of mass flow rate of the mixture leaving the chamber is wrong because by taking this value, entropy generation is coming negative, which is not possible. Thus, we applied the conservation of energy to calculate the mass flow rate....
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