Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. The remaining steam expands through the second-stage turbine to the condenser pressure of 2 lbf/in.² Each turbine stage and the pump have isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, and steam generator is at constant pressure. Condensate exiting the feedwater heater as saturated liquid at 120 lbf/in.2 undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400 lbf/in.2 and a temperature equal to the saturation temperature at 120 lbf/in.² The net power output of the cycle is 1 x 10° Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator. (c) the percent thermal efficiency.

Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the closed feedwater heater. The remaining steam expands through the second-stage turbine to the condenser pressure of 2 lbf/in.² Each turbine stage and the pump have isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, and steam generator is at constant pressure. Condensate exiting the feedwater heater as saturated liquid at 120 lbf/in.2 undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400 lbf/in.2 and a temperature equal to the saturation temperature at 120 lbf/in.² The net power output of the cycle is 1 x 10° Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator. (c) the percent thermal efficiency.

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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Water is the working fluid in an ideal Rankine cycle. Steam enters the turbine at 1400 Ibę/in? and 1000°F. The condenser pressure is 2 Ib/in.? The net power output of the cycle is 250 MW. Cooling water experiences a temperature increase from 60°F to 76°F, with negligible pressure drop, as it passes through the condenser. Step 1 Your answer is correct. Determine the mass flow rate of steam, in Ib/h. 1536000 Ib/h
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Water is the working fluid in an ideal Rankine cycle. Steam enters the turbine at 1400 lb/in² and 1000°F. The condenser pressure is 2 lb-/in.² The net power output of the cycle is 250 MW. Cooling water experiences a temperature increase from 60°F to 76°F, with negligible pressure drop, as it passes through the condenser. Step 1 Determine the mass flow rate of steam, in lb/h. m = Hint Step 2 Your answer is correct. Oin 1513083.513 Determine the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator. = i lb/h Save for Later Btu/h Attempts: 3 of 4 used Attempts: 0 of 4 used Submit Answer
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