Answer to Question #153588 in Mechanical Engineering for Rhemark Lava

Question #153588

Steam flows through a turbine at the rate of 50 kg/min with ΔKE= 0 and Q = 0. At entry, its pressure is 1200kPaa, its specific volume = 0.2 m3 /kg and its internal energy is 1230 KJ/kg. At exit, its pressure is 5.6 kPaa, its specific volume is 20.5 m3 /kg and its internal energy is 902 KJ/kg. What horsepower is developed?, (b) The same as (a) except that the heat loss from the turbine is 10 KJ/kg of steam


1
Expert's answer
2021-01-06T06:05:05-0500

A)

"w = m(n1-n2)"

"w = m[ ( u1-u2)+(p1v1 -p2v2)"

"Wout = \\frac{50}{60}[ ( 1230 - 902) +(1200\\times0.2 - 5.6\\times20.5)]"

"W out = 377.667 kw = 506.256 hp"

B)

W out = power output in the previous case - Qloss

"w = 377.667 - \\frac{50}{60}\\times10"

"Wout = 369.33 kw = 495.085 hp"


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