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Response Details:
h1 = h2 + wc
s1 = s2
inlet: T1 = 5oC, x1 = 0.965 use Table B.5.1 in textbook
s1 = sf + x1sfg = 1.0243 + 0.965×0.6995 = 1.6993 kJ/kg K,
h1 = hf + x1hfg = 206.8 + 0.965×194.6 = 394.6 kJ/kg
exit: P2 = 3 MPa
and s2 = s1 = 1.6993 kJ/kg K;
T2 = 90oC, h2 = 436.2 kJ/kg
wc = h1 - h2 = -41.6 kJ/kg
Tank; VT = 2 m3, PT = 3 MPa
and Q = 0, W = 0, me = 0, m1 = 0, m2 = mi
u2 = hi = 436.2 kJ/kg
Final state: PT = 3 MPa, u2 = 436.2 kJ/kg
TT = 101.9oC, vT = 0.006783 m3/kg
mT = VT/vT = 294.84 kg
total work input to the compressor:
Wc = mT(wc)
Wc = 294.84*41.6
total work input to the compressor, Wc = 12 265 kJ
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