Page 196 - Entrophy Analysis in Thermal Engineering Systems

194 Index

compression and pressure ratios, 62
Combined Carnot engine (Continued)
total entropy generation, 140 efficiency comparison, 64, 64t
Combined cycle irreversible, 85–86, 86t,97–99, 101
bottoming steam cycle, 119, 123–124 p-V diagram, 61–62, 61f
cooling water, 119–120 thermal efficiency, 61–62
gas turbine cycle, 119 T-s diagram, 86f
hot flue gases, 119
maximum thermal efficiency, 122
modified design, 124–126 E
pressurized and preheated water, 119 EES. See Engineering equation solver (EES)
recuperator, 119 Endoreversible engines, 68, 85
specific entropy generation (SEG), 122 Carnot vapor cycle, 77–82
thermal efficiency, 121 Curzon-Ahlborn model, 68–71
thermodynamic model, 120–122 maximum power efficiency, 189
topping gas cycle, 123–124 modified Novikov’s engine, 74–77
Combined gas laws, 21 Novikov’s engine, 72–74
Energy conservation, 3
Combined gas turbine, 142, 142f
Combustion gas, 112–113, 122, 174 Energy dispersal view, 53–54
Combustion power plant, 173–174 Engineering equation solver (EES), 1–2
Combustion temperature, 80 Entropy
Compression ratio, 56–57 definition, 41–42, 45
of Atkinson cycle, 95 interpretation of, 52–54
of Brayton cycle, 58 sources of
of Diesel cycle, 62 expansion of ideal gas, 48–50, 48f
of Stirling cycle, 57 heat flow, 46
Compressor pressure ratio, 122, 124, 145 mixing, 50–52, 50f
Condensate pump, 119 pressure drop, 46–48
Entropy generation, 41–42
Condenser, 119, 121t
Conservation law, 149 Carnot vapor cycle, 79, 79f
Conservation of energy, 3 Curzon-Ahlborn engine, 68–69
Conservation of mass, 2 fuel cell, 133
Conversion efficiency, fuel-to-power, modified Novikov’s engine, 75
132–137 Novikov’s model, 74
Cooling water, 119–121 solid oxide fuel cell (SOFC), 144
Corollaries, 30–31 Equivalence of heat and work, 19–21
Curzon-Ahlborn engine, 68–71 Equivalence-value, 38–39
maximum power production, 70 Ericsson cycle, 38, 56t,65
temperature-specific entropy (T-s) Exergy
chemical exergy, 172–176
diagram, 68–69, 68f
combined first and second laws, 169
thermal efficiency, 70–71, 71–72f
entropy-based analysis, 182
flow exergy, 171–172
D maximum efficiency, 177–179
Dalton’s law, 16 mechanical theory of heat, 169, 181
Davy’s experiment, 15–16 minimum exhaust temperature, 179–180
DC-AC inverter efficiency, 144–145 second law, limitation of, 181–182
thermal exergy, 169–171
Deaerator, 119, 121t
vs. entropy, 180–181
Diesel cycle, 56t