Question

1.) Nitrogen expands in a turbine at a rate of 0.17 kg/s. The nitrogen enters the turbine at 750 kPa, 580 K and it exits at 195 kPa, 323 K. The power delivered by the turbine is measured to 38 kW. Neglect potential and kinetic energies. For Nitrogen, Cp = 1039j/Kg.k - Calculate the amount of heat transfer. Determine if the heat is added to the system or lost from the system. Plot the TV diagram showing all the states and num - 2.) Piston Cylinder device contains a 0.32 m3 of air at an initial condition of 300 kPa, 500 K and is compressed isothermally to a final pressure of 700 kPa. For air, R=287 J/Kg.K Determine the work done during the process. 12% Determine if the work is done on the system or done by the system. Plot the PV diagram showing all the states and numbers on it.

Answer 1

An 2 given data Vi : 0.32 m? Pi = 3ookpa Ti sook comprened to Theymally to a final peelsuge of 700 kPa R = 287 J/kg.k Then The work done! According to eqaution of state- PV = nRT N2 MRTIO Pa V₂ = nRT2 V2 = nRT2 P2 MR T2 MRT In ima P2 x v. Heye n=1 = لا 1 X 287 x 500 in IX 287 X 500 700 x103 x 0.32 -6.4x109 Jule. 3 Meye work done is negative and system is compuensed That mean work done on the system,

Then PV diaparam! P PC T-sook N₂ cup Pi is o Theynally compueuion. <