Q3) Steam at a pressure of 20 bar and 250°C enters a turbine and leaves it finally at a pressure of 0.05 bar. Steam is bled off at pressures of (5, 1.5 and 0.3 bar). Assuming (i) that the condensate is heated in each heater upto the saturation temperature of the steam in that heater, (ii) that the drain water from each heater is cascaded through a trap into the next heater on the low pressure side of it, (iii) that the combined drains from the heater operating at 0.3 bar are cooled in a drain cooler to condenser temperature, calculate the following: (i) Mass of bled steam for each heater per kg of steam entering the turbine (ii) Thermal efficiency of the cycle, (iii) Thermal efficiency of the Rankine cycle (iv) Theoretical gain due to regenerative feed heating, (v) Steam consumption in kg/kWh with or without regenerative feed heating, and (vi) Quantity of steam passing through the last stage nozzle of a 50000 kW turbine with and without regenerative feed heating. 1 kg Tur bin e 1-m, 1-m, - m2 1-m, - m2- m, m,, h, m3, h3 Condenser m, + m2 + m3 3 1 kg, h. 1 kg Drain cooler m,, h. (m, + m2), h (m, + m2 + m3), h

Q3) Steam at a pressure of 20 bar and 250°C enters a turbine and leaves it finally at a pressure of 0.05 bar. Steam is bled off at pressures of (5, 1.5 and 0.3 bar). Assuming (i) that the condensate is heated in each heater upto the saturation temperature of the steam in that heater, (ii) that the drain water from each heater is cascaded through a trap into the next heater on the low pressure side of it, (iii) that the combined drains from the heater operating at 0.3 bar are cooled in a drain cooler to condenser temperature, calculate the following: (i) Mass of bled steam for each heater per kg of steam entering the turbine (ii) Thermal efficiency of the cycle, (iii) Thermal efficiency of the Rankine cycle (iv) Theoretical gain due to regenerative feed heating, (v) Steam consumption in kg/kWh with or without regenerative feed heating, and (vi) Quantity of steam passing through the last stage nozzle of a 50000 kW turbine with and without regenerative feed heating. 1 kg Tur bin e 1-m, 1-m, - m2 1-m, - m2- m, m,, h, m3, h3 Condenser m, + m2 + m3 3 1 kg, h. 1 kg Drain cooler m,, h. (m, + m2), h (m, + m2 + m3), h

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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