15 3 In An Ideal Rankine Cycle Steam Enters The Turbine At 8 Mpa And 500 C The Condenser Pressure Is 7 5 Kpa The Net P 1 (122.37 KiB) Viewed 43 times
15 3 In An Ideal Rankine Cycle Steam Enters The Turbine At 8 Mpa And 500 C The Condenser Pressure Is 7 5 Kpa The Net P 2 (51.85 KiB) Viewed 43 times
15.3 In an ideal Rankine cycle steam enters the turbine at 8 MPa and 500°C. The condenser pressure is 7.5 kPa. The net power produced by the cycle is 100 MW. Determine (a) the heat transfer to the water in the steam generator; (b) the cycle thermal efficiency; (c) the mass flow rate of cooling water required if it enters the condenser at 20°C and leaves at 35°C. 15.4 Recalculate Problem 15.3 with turbine and pump efficiencies of 85% and 80%, respec- tively 15.5 A Rankine cycle produces 100 MW of power with a condenser pressure of 7.5 kPa and an inlet turbine temperature of 500°C. Determine the cycle thermal efficiency and the steam flow rate required for an inlet turbine pressure of (a) 17.5 MPa; (b) 1750 kPa. 15.6 A steam power plant operates on the Rankine cycle, with steam leaving the boiler at 6.0 MPa and 500°C. The plant supervisor wants to know the effect of back pressure (condensing pressure) on the cycle efficiency. (a) Determine and graph the cycle effi- ciency for back pressures of 7, 15, 30, 45, and 70 kPa. (b) Discuss the results in terms of available energy. 15.8 Recalculate Problem 15.7 for boiler pressures of 30 000 kPa and 1000 kPa, all other conditions being the same. Compare the results to the original problem. 15.9 Concentrating solar collectors are used to provide the heat source for a Rankine cycle using water as the working substance. The design specifications require a power output of 10 MW. Commercially available collectors allow steam to be generated at 2500 kPa and 300°C. The cycle low pressure is assumed to be 7.5 kPa. Determine (a) the cycle thermal efficiency; (b) the steam flow rate.
SUBJECT:THERMODYNAMICS MECHANICAL ENGINEERING PLEASE COMPLETE SOLUTION WITH GIVEN, FIND, SKETCH AND GIVEN DATA AND ANSWER FORMAT: Solution Given: An ideal Rankine cycle with combustion gas and cooling-water temperature changes. Find: The cycle irreversibility. Sketch and Given Data: Combustion gas 4250 K (b) P2 = 7000 kPa T = 550°C 12 m = 5 kg/s 2000°K Air (a) Fuel Turbine - B3 = 20 kPa 3 20° C Condenser Cooling water 40° C
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!