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an air compressor with intercooling. The numbers Figure given for each stream represent exergy flows. All costs are levelized costs. The cost per exergy unit of stream 2 is c2 = $10.0/GJ. The costs associated with streams 1 (air) and 5 (feedwater inlet) are zero. The cost rates associated with capital investment and operating and main- tenance expenses are Compressor $0.01/s %3D Feedwater heater Żrwh = $0.02/s %3D Calculate: (a) the exergy destruction rates and the exergy destruction ratios for the compressor and the feedwater heater; (b) the exergetic efficiencies of the compressor, the feedwater heater, and the overall system shown in Figure P8.3; (c) the cost rate and the cost per exergy unit associated with streams 3 (compressed air), 4 (cooled compressed air), and 6 (preheated feedwater). 6. Preheated Feedwater 5 Feedwater 0 MW 1.5 MW Compressed Air FEEDWATER 2 MW HEATER 4 Cooled Air 9 MW 2 Power (to next compression stage) Ino li 10 MW Air lbo O MW Figure P8.3

an air compressor with intercooling. The numbers Figure given for each stream represent exergy flows. All costs are levelized costs. The cost per exergy unit of stream 2 is c2 = $10.0/GJ. The costs associated with streams 1 (air) and 5 (feedwater inlet) are zero. The cost rates associated with capital investment and operating and main- tenance expenses are Compressor $0.01/s %3D Feedwater heater Żrwh = $0.02/s %3D Calculate: (a) the exergy destruction rates and the exergy destruction ratios for the compressor and the feedwater heater; (b) the exergetic efficiencies of the compressor, the feedwater heater, and the overall system shown in Figure P8.3; (c) the cost rate and the cost per exergy unit associated with streams 3 (compressed air), 4 (cooled compressed air), and 6 (preheated feedwater). 6. Preheated Feedwater 5 Feedwater 0 MW 1.5 MW Compressed Air FEEDWATER 2 MW HEATER 4 Cooled Air 9 MW 2 Power (to next compression stage) Ino li 10 MW Air lbo O MW Figure P8.3

Introduction to Chemical Engineering Thermodynamics
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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8.3 Figure P8.3 shows an air compressor with intercooling. The numbers given for each stream represent exergy flows. All costs are levelized costs. The cost per exergy unit of stream 2 is c2 = $10.0/GJ. The costs associated with streams 1 (air) and 5 (feedwater inlet) are zero. The cost rates associated with capital investment and operating and main- %3D tenance expenses are Compressor $0.01/s %3D Feedwater heater Żrwh = $0.02/s %3D Calculate: (a) the exergy destruction rates and the exergy destruction ratios for the compressor and the feedwater heater; (b) the exergetic efficiencies of the compressor, the feedwater heater, and the overall system shown in Figure P8.3; (c) the cost rate and the cost per exergy unit associated with streams 3 (compressed air), 4 (cooled compressed air), and 6 (preheated feedwater). 6. Preheated Feedwater 5 Feedwater O MW 1.5 MW Compressed Air FEEDWATER НЕАTER 2 MW 3 4 Cooled Air 9 MW 2 Power (to next 10 MW compression stage) 1 Air O MW Figure P8.3
Transcribed Image Text:8.3 Figure P8.3 shows an air compressor with intercooling. The numbers given for each stream represent exergy flows. All costs are levelized costs. The cost per exergy unit of stream 2 is c2 = $10.0/GJ. The costs associated with streams 1 (air) and 5 (feedwater inlet) are zero. The cost rates associated with capital investment and operating and main- %3D tenance expenses are Compressor $0.01/s %3D Feedwater heater Żrwh = $0.02/s %3D Calculate: (a) the exergy destruction rates and the exergy destruction ratios for the compressor and the feedwater heater; (b) the exergetic efficiencies of the compressor, the feedwater heater, and the overall system shown in Figure P8.3; (c) the cost rate and the cost per exergy unit associated with streams 3 (compressed air), 4 (cooled compressed air), and 6 (preheated feedwater). 6. Preheated Feedwater 5 Feedwater O MW 1.5 MW Compressed Air FEEDWATER НЕАTER 2 MW 3 4 Cooled Air 9 MW 2 Power (to next 10 MW compression stage) 1 Air O MW Figure P8.3
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