Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater. Steam enters the turbine at 1400 lbf/ 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 pum have isentropic efficiencies of 80%. 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/ 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 pum have isentropic efficiencies of 80%. 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.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text: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 80%. 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.²2 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.
Part A
Determine for the cycle the mass flow rate of steam entering the first stage of the turbine, in lb/h.
m₁ = i
lb/h
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