A steam turbine receives steam steadily at 10 bar with a enthalpy of 3000 kj/kg. The work output is 250 kj/kg. The changes in kinetic and potential energies are negligible the heat transfer from the turbine casing to the surroundings is equal to (a) select one:
a. (a) 150 kj
b. 50 kj
c. (a) 250 kj
d. (a) 0 kj
Answers
Answered by
1
The heat transfer from the turbine casing to the surroundings is equal to 50 KJ/kg.
Explanation:
- Applying the equation of Steady Flow of Energy.
- Equation when steam enters the turbine.
= m (h1 + v1^2/2 + gz1 ) + Q(in) + W(in)
- Equation when steam leaves the turbine.
= m (h2+v2^2/2 + gz2) + Q(out) + W(out)
- Taking specific quantities.
(h1)+Qin+W˙in=(h2)+Qout+W˙out
W˙out=250 kJ/kg (specific work output of turbine)
Q˙in=W˙in=0
m˙(h1)=m˙(h2)+Q˙out+W˙out
- Heat transfer from turbine casing to surroundings
Q˙out=[m˙(h1–h2)]–W˙out
=(3000–2700)−250
=50 kJ/kg
Hence the heat transfer from the turbine casing to the surroundings is equal to 50 KJ/kg.
Also learn more
The heat of combustion of benzene in a bomb calorimeter is found to be 3263.9kj/mole at 25 degree celsius. Calculate the heat of combustion of benzene at constant temperature ?
https://brainly.in/question/5482483
Similar questions