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 c, = $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 Ż. = $0.01/s Feedwater heater ŻAwh = $0.02/s 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).

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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 I (air) and 5 (feedwater inlet) are zero. The
cost rates associated with capital investment and operating and main-
tenance expenses are
Compressor
Ż. = $0.01/s
%3D
Feedwater heater
Żiwh = $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).
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 I (air) and 5 (feedwater inlet) are zero. The cost rates associated with capital investment and operating and main- tenance expenses are Compressor Ż. = $0.01/s %3D Feedwater heater Żiwh = $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).
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