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.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam
enters the turbine at 1400 lbf/in.? and 1150°F and expands to 500 lbf/in.?, where some of the steam is extracted and diverted to the
closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 Ibf/in.?undergoes a throttling
process to 120 lbf/in.? as it passes through a trap into the open feedwater heater.
The feedwater leaves the closed feedwater heater at 1400 lbf/in.? and a temperature equal to the saturation temperature at 500
Ibf/in.? The remaining steam expands through the second-stage turbine to 120 lbf/in.?, where some of the steam is extracted and
diverted to the open feedwater heater operating at 120 lbf/in.?Saturated liquid exits the open feedwater heater at 120 lbf/in.?
The remaining steam expands through the third-stage turbine to the condenser pressure of 5 Ibf/in.2 The turbine stages and the
pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open
feedwater heater, and steam generator is at constant pressure. 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.
Transcribed Image Text:Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one open feedwater heater. Steam enters the turbine at 1400 lbf/in.? and 1150°F and expands to 500 lbf/in.?, where some of the steam is extracted and diverted to the closed feedwater heater. Condensate exiting the closed feedwater heater as saturated liquid at 500 Ibf/in.?undergoes a throttling process to 120 lbf/in.? as it passes through a trap into the open feedwater heater. The feedwater leaves the closed feedwater heater at 1400 lbf/in.? and a temperature equal to the saturation temperature at 500 Ibf/in.? The remaining steam expands through the second-stage turbine to 120 lbf/in.?, where some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.?Saturated liquid exits the open feedwater heater at 120 lbf/in.? The remaining steam expands through the third-stage turbine to the condenser pressure of 5 Ibf/in.2 The turbine stages and the pumps each operate adiabatically with isentropic efficiencies of 85%. Flow through the condenser, closed feedwater heater, open feedwater heater, and steam generator is at constant pressure. 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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