### Assignments

Assignments

Assignment 8:
(7.17)  Impossible   (7.23)Impossible   (7.33) 0.687  (7.34) 1.09 MW   (7.43) 41m^2

Assignment 9:
(8.4) T_L =99.63 C, efficiency=  0.287, heat added=1716.2 kJ/kg, s=6.073 kJ/kg K
(8.17)  0.385 m^3
(8.24)  Heat transfer = 4910 kJ, work = 1290.3 kJ
(8.36)  Total entropy change of universe= 0.395 kJ/kg K >0  => satisfies Second Law.
(8.40) 2.57 kJ/K
(8.50)  Variable specific heat  : 697.3 K, -253.2 kJ/kg
Constant specific heat, value from Table A.5: 789.7,K -254.4 kJ/kg
Constant specific heat, value  at an intermediate temperature from Table A.6:
692.4 K, -250.5 kJ/kg
(8.59) W=0, net entropy change of universe=0.2947 kJ/K

Assignment  10
(9.5) 141.86 kJ/kg, 430.5 K, 532.7 m/s
(9.14) 149.6 kPa, 322.9 K
(9.20) 242 kPa, 138.3 C
(9.50) 47.288 kg/min, 8.94  kJ/K min
(9.66) 17696 kW, 7.20 kW/K
(9.80)Work=-107.5 kW, Heat transfer=-102.5 kW

Assignment 11
(11.4) 758 C, 4.82 kg/s
(11.8) W_turbine = 33,350 kW, W_pump = -484kW
mass flow rate at low T heat  ex= 142,840 kg/s
mass flow rate at high T heat ex = 147,280 kg/s
Thermal efficiency = 0.027
(11.13) W_turbine = 1204 kJ/kg, W_pump=-4.03 kJ/kg,
q_boiler = 3252.8 kJ/kg, q_condenser = -2052.9 kJ/kg
Thermal efficiency = 0.369
(11.15) 21.568 kg/s,-44,786 kW,
Thermal efficiency of actual cycle =0.307,
Thermal efficiency of Carnot cycle =0.526

Assignment 12
(11.49) 324.8 kJ/kg, thermal efficiencey=0.485
(11.71) T_3 = 3127K,P_3 = 6958 kPa, thermal eff=0.541,mep = 1265 kPa,
(11.80)  compress ratio =12.67, thermal eff=0.587, mep=997 kPa
(11.85) T_H= 700 K, P_2 = 2.47 Mpa
(11.92) q_L = 106.9 kJ/kg, q_H=141.66 kJ/kg, beta=3.076, eta_compressor = 0.7724
(11.95) W_c = 11.26 kW,  S_gen = 0.0094 kW/K
(11.98) s_gen = 0.029 kJ/kg K, Q_L = 5.325 kW, beta=2.219
(11.101) beta=0.573

Complete Solutions

Statistics

Assignment 1:  Max: 10 ; Min 0; Average: 9.2/10
Assignment 2:  Max 12; Min 0 ; Average: 9.71/10
Assignment 3:  Max 14; Min 0; Average: 11.16/14
Assignment 4:  Max 14; Min 0; Average: 10.71/14
Assignment 5:  Max 14; Min 0; Average: 10.71/14

Assignment Submission Procedures

All assignments must be written in pencil. Please write only on one side of the page. Please staple your pages together. Please put your name at the top of your assignment. Assignments not conforming to these guidelines will not be graded.