Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.? and 1000°F and expands to 120 Ibf/in.?, 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 5 lbf/in.2 Each turbine stage and the pump have isentropic efficiencies of 90%. 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.? undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400 lbf/in.? and a temperature equal to the saturation temperature at 120 lbf/in.2 The net power output of the cycle is 1x 10° Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the fırst stage of the turbine, in Ib/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.? and 1000°F and expands to 120 Ibf/in.?, 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 5 lbf/in.2 Each turbine stage and the pump have isentropic efficiencies of 90%. 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.? undergoes a throttling process as it passes through a trap into the condenser. The feedwater leaves the heater at 1400 lbf/in.? and a temperature equal to the saturation temperature at 120 lbf/in.2 The net power output of the cycle is 1x 10° Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the fırst stage of the turbine, in Ib/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 a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/in.?
and 1000°F and expands to 120 Ibf/in.?, 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 5 lbf/in.² Each turbine stage and the pump
have isentropic efficiencies of 90%. 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.? undergoes a throttling process as it passes
through a trap into the condenser. The feedwater leaves the heater at 140O Ibf/in.? and a temperature equal to the saturation
temperature at 120 lbf/in.2 The net power output of the cycle is 1x 10° Btu/h.
Determine for the cycle:
(a) the mass flow rate of steam entering the first stage of the turbine, in Ib/h.
(b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator.
(c) the percent thermal efficiency.

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