httpimgurcomqr9d47r please use this link to view and answer

http://imgur.com/qr9d47r

please use this link to view and answer the question.

please be neat

please state which tables were use to identify the properties

Solution

sol :

given Isentroipic turbine efficiency is 0.88

isentropic pump efficiency is 0.80

Turbine inlet conditions :

pressure 3.4 MPa, Temperature 375^oC

Pump inlet conditons pressue 10kPa, Temperature 35^oC

The feedwater enters the steam generator at 3.6 MPa, 30°C

from steam tables at 3.5 MPa and 400 ^oC

h1 = 3222.3 kJ/kg, s1 = 6.8405 kJ/kg K,   

at 3.4 MPa and 375 oC

h2 = 3165.7 kJ/kg, s2 = 6.7675 kJ/kg K

3s: s_3S = s₂ x_3S = 0.8157,

h_3S = 2143.6 kJ/kg
w_T,S = h₂ - h_3S = 3165.7 - 2143.6 = 1022.1 kJ/kg

w_T,AC = _wT,S = 899.4 kJ/kg,

3ac: h3 = h2 - w_T,AC = 2266.3 kJ/kg
-w_P,S = v_f *(P5 - P4) = 0.001006(3700 - 10) = 3.7 kJ/kg

-w_P,AC = -w_P,S/_P = 4.6 kJ/kg
q_H = h1 - h6 = 3222.3 - 129.0 = 3093.3 kJ/kg

= w_Net/q_H = (899.4 - 4.6)/3093.3 = 0.289

C.V. Line from 1 to 2: w = 0,   
Energy Equation.: q = h₂ - h₁ = 3165.7 - 3222.3 = - 56.6 kJ/kg

Entropy Equation .: s₁ + s_gen + q/T₀ = s2

=> s_gen = s₂ - s₁ -q/T₀

= 6.7675 - 6.8405 - (-56.6/298.15)

= 0.117 kJ/kg K