steem enters a turbain operating at steady state at 2 mpa , 350 c of a certain g
ID: 1842125 • Letter: S
Question
steem enters a turbain operating at steady state at 2 mpa , 350 c of a certain gas is contained within a piston-cylinder assembly. The gas undergoes a The initial pressure process for which the pressurevolume relationship is is 0.2 m The change in specific in is 300 kPa, the initial volume is 0.1 m and the final volume 3. changes internal energy of the gas in the process is 55 kJ/kg. There are no significant kinetic or potential energy. Determine: (a) The work done during the process in kJ. (b) The net heat transfer for the process in kJExplanation / Answer
(a)
PV^1.5 = constant
3 x 10^5 x .1 ^1.5 = P2 x .2^1.5
P2 = 1.06 x 10^5
Work done during the process:
Work = P2V2 - P1V1 / 1 - n
W = 17573.6 J
(b)
Net Heat Transfer:
Q = U + W
Q = - 55 x 1000 x 0.4 + 17573.6
Q = -4426.4 J
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