Water is the working fluid in an ideal regenerative Rankine cycle with one open feedwater heater. Steam enters the turbine at 1400lbf/in.² and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heateroperating at 120 lbf/in.² The remaining steam expands through the second-stage turbine to the condenser pressure of 6 lbf/in.²Saturated liquid exits the open feedwater heater at 120 lbf/in.² The net power output of the cycle is 5.5 x 108 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.

(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.

(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.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 58P

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Question

Water is the working fluid in an ideal regenerative Rankine cycle with one open 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 open feedwater heater
operating at 120 lbf/in.² The remaining steam expands through the second-stage turbine to the condenser pressure of 6 lbf/in.²
Saturated liquid exits the open feedwater heater at 120 lbf/in.² The net power output of the cycle is 5.5 x 108 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.

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