2981 Evaluate an exergetic efficiency for the overall cogeneration system. The exergetic efficiency is defined as the net rate of exergyoutput divided by the net rate of exergy input.ε = i% In a cogeneration system, a Rankine cycle operates with steam entering the turbine at 800 lbf/in.², 700°F, and a condenser pressure of180 lb-/in.² The isentropic turbine efficiency is 60%. Energy rejected by the condensing steam is transferred to a separate processstream of water entering at 250°F, 140 lbf/in.² and exiting as saturated vapor at 140 lb/in.²2 The mass flow rate of the process streamis 49,000 lb/h. Let To = 70°F, po = 14.7 lb/in.²

Given-Information:- p1 = 800 lbf/in2T1 = 700°Fpc = 180 lbf/in2ηt = 60%T2 = 250°FT0 = 70°Fpo = 14.7…

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Engineering

Mechanical Engineering

981

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Section: Chapter Questions

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Question

2981

Evaluate an exergetic efficiency for the overall cogeneration system. The exergetic efficiency is defined as the net rate of exergy
output divided by the net rate of exergy input.
ε = i
%

In a cogeneration system, a Rankine cycle operates with steam entering the turbine at 800 lbf/in.², 700°F, and a condenser pressure of
180 lb-/in.² The isentropic turbine efficiency is 60%. Energy rejected by the condensing steam is transferred to a separate process
stream of water entering at 250°F, 140 lbf/in.² and exiting as saturated vapor at 140 lb/in.²2 The mass flow rate of the process stream
is 49,000 lb/h. Let To = 70°F, po = 14.7 lb/in.²

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