Chapter 7, Problem 7.53P

Steam at 20 MPa and 620°C enters a steam turbine and expands to a condenser pressure of 100 kPa. An open feedwater heater is added operating at 2 MPa. Calculate the cycle thermal efficiency in %. Use the unrounded values of the work of the turbine, work of the pump, and heat added when needed. Please use the green book entitled "Thermodynamics Properties of Water Including Vapor, Liquid, and Solid Phases by Keenan, Keyes, Hill, and Moore for the steam table.

Pls. refer to the answer keys so that I will know if my solution is wrong.

same compressor inlet and exit conditions. Answers: (a) 4.33, ing the waste heat to the outdoor air at 34°C. The - pressor at 400 kPa as a saturated vapor at a rate of 80 L/min COP, (b) the maximum COP, and (c) the minimum volume and leaves at 1200 kPa and 70°C. Determine (a) the actual working fluid is used to keep a room at 23°C by reject- An air-conditioner with refrigerant-134a as the and lights amounts to 900 W. The refrigerant enters the com- 250 kJ/min while the heat generated by the computer, TV, gains heat through the walls and the windows at a rate of 6-108 room flow rate of the refrigerant at the compressor inlet for (b) 26.9, (c) 12.9 L/min G.000 Он 1.2 MPa 70°C Condenser Expansion valve Compressor 400 kPa Evaporator sat. vapor