Steam flows through a turbine The inlet stream is at 1200 kP

Steam flows through a turbine. The inlet stream is at 1200 kPa and 290 degrees C. The pressure at the exit is 75 kPa. Assume that the turbine is isentropic. This means that the entropy of the steam stays constant while passing through the turbine.

a) Determine the quality and temperature of the steam at the exit.

b) Determine the specific work produced by the turbine.

ME/CHE 311 en ExAM 02--PART 2 4 20 points) FALL 2016 steam flows through a turbine. The inlet is at 1200 Pa and 290 The pres at the exit is stream entropy of 75 kPa. that turbine ia means that the (a) the steam stream stays isentropic. This turbine points) constant while passing through the Determine the quality and temperature of the steam at the exit.

Solution

>> Considering Initial Conditions

P1 = 1200 kPa, and

T1 = 290 C = 563 K

Observing from Steam Table at these conditions,

h1 = Enthalpy = 3024.6 KJ/Kg

and, s1 = Entropy = 6.995 KJ/Kg-K

>> Now as the process is Isentropic

So, Entropy will remain constant

=> s1 = s2 = 6.995 KJ/Kg-K

and given that, P2 = exit pressure = 75 kPa

>> From Steam Table at these conditions,

T2 = 364.908 K = 91.908 C

Condition of STeam is Wet

and, x = Quality = 0.926

Also, h2 = Exit Enthalpy = 2494.2862 KJ/Kg

So, Specific Work DOne = h1 - h2 = 3024.6 - 2494.2862

=> Specific Work Done = 530.31 KJ/Kg ............ANSWER......