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Mechanical Efficiency of Heat Engines - James R. Senft

Mechanical Efficiency of Heat Engines

Paperback Published: 21st July 2011
ISBN: 9780521169288
Number Of Pages: 188

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This 2007 book presents a developed general conceptual and basic quantitative analysis as well as the theory of mechanical efficiency of heat engines that a level of ideality and generality compatible with the treatment given to thermal efficiency in classical thermodynamics. This yields broad bearing results concerning the overall cyclic conversion of heat into usable mechanical energy. The work reveals intrinsic limits on the overall performance of reciprocating heat engines. The theory describes the general effects of parameters such as compression ratio and external or buffer pressure on engine output. It also provides rational explanations of certain operational characteristics such as how engines generally behave when supercharged or pressurized. The results also identify optimum geometric configurations for engines operating in various regimes from isothermal to adiabatic and are extended to cover multi-workspace engines and heat pumps. Limited heat transfer due to finite-time effects have also been incorporated into the work.

Prefacep. xi
Energy Transfers in Cyclic Heat Enginesp. 1
Heat Engine Diagramsp. 1
The Basic Cyclic Heat Enginep. 4
Buffer Pressurep. 5
Shaft Workp. 7
Buffer Pressure and Energy Transfersp. 9
Mechanism Effectiveness and Mechanical Efficiencyp. 12
Mechanism Effectivenessp. 13
Mechanical Efficiencyp. 15
Forced Workp. 17
General Efficiency Limitsp. 20
The Fundamental Efficiency Theoremp. 20
The Stirling Comparison Theoremp. 21
Constant Mechanism Effectivenessp. 24
Optimum Buffer Pressurep. 25
Optimally Buffered Stirling Enginesp. 26
The Mechanical Efficiency Limitp. 29
The Brake Thermal Efficiency Limitp. 31
Average Cycle and Optimum Buffer Pressurep. 32
Compression Ratio and Shaft Workp. 34
Limits on Compression Ratiop. 34
Shaft Work Limitsp. 36
Temperature Effectsp. 39
Proof of the Maximum Shaft Work Theoremp. 43
Pressurization Effectsp. 45
System Charging Monomorphic Enginesp. 45
Engines Charged Above Buffer Pressurep. 48
The Workspace Charging Theoremp. 50
Charge Effects in Ideal Stirling Enginesp. 53
Workspace Charging Ideal Stirling Enginesp. 54
Efficacious Cyclesp. 56
Non-Efficacious Cyclesp. 58
Practical Implicationsp. 58
Crossley-Stirling Enginesp. 64
Crossley Cyclesp. 65
Crossley Cycle Analysisp. 66
Forced Work of the Crossley Cyclep. 67
The Swept Volume Ratio Problemp. 71
Crossley-Stirling Optimum Compression Ratiosp. 74
Conclusionsp. 78
Generalized Engine Cycles and Variable Buffer Pressurep. 80
Parametric Representationp. 80
Average Cycle Pressuresp. 83
Variable Buffer Pressurep. 83
Buffer Pressure and Energy Transfersp. 85
Mechanical Efficiencyp. 87
Pressurization Effectsp. 89
Multi-Workspace Engines and Heat Pumpsp. 90
Multi-Cylinder Enginesp. 90
Split-Workspace Enginesp. 92
Engines with Double-Acting Pistonsp. 94
Double-Acting Split-Workspace Enginesp. 97
Heat Pumpsp. 98
Optimum Stirling Engine Geometryp. 101
The Gamma Enginep. 101
The Schmidt Analysisp. 102
The Schmidt Model for Gamma Enginesp. 103
Indicated Workp. 105
Shaft Workp. 106
Parameter Effects on Brake Outputp. 106
Optimum Swept Volume Ratio and Phase Anglep. 107
Swept Volume Ratio Selectionp. 108
Internal Temperaturesp. 111
Indicated Work Maximap. 112
Phase Anglep. 113
Dead Space Effectsp. 114
Alternate Engine Configurationsp. 116
Conclusionsp. 116
Heat Transfer Effectsp. 117
Heat Exchangep. 117
Heat Transfer Assumptionsp. 118
Maximum Indicated Powerp. 120
Maximum Brake Powerp. 120
Brake Thermal Efficiency at Maximum Powerp. 123
Heat Losses in Stirling Enginesp. 125
Maximum Indicated Power with Heat Leakagep. 128
Operating Frequency and Temperature Ratio in Stirling Enginesp. 130
Maximum Brake Power of Stirling Engines with Heat Lossp. 131
Universal Power Maximap. 132
Power Relative to Efficiencyp. 133
General Theory of Machines, Effectiveness, and Efficiencyp. 135
Kinematic Machinesp. 135
State Parameterp. 136
Actuator Forcesp. 136
Force Relationp. 137
Internal Energyp. 138
Force Processesp. 139
Factional Dissipationp. 140
Graphical Representationp. 142
Reversed Operationp. 143
Mechanism Effectivenessp. 145
Content of the Effectiveness Functionp. 147
Actuator Workp. 148
Constant Internal Energyp. 151
An Ultra Low Temperature Differential Stirling Enginep. 153
Backgroundp. 153
Compression Ratio Limitsp. 156
Mean Volume Specific Workp. 158
Engine Performancep. 160
Derivation of Schmidt Gamma Equationsp. 163
Volume and Pressure Functionsp. 163
Indicated Workp. 165
Forced Workp. 165
Referencesp. 167
Indexp. 171
Table of Contents provided by Ingram. All Rights Reserved.

ISBN: 9780521169288
ISBN-10: 0521169283
Audience: Professional
Format: Paperback
Language: English
Number Of Pages: 188
Published: 21st July 2011
Publisher: Cambridge University Press
Country of Publication: GB
Dimensions (cm): 22.9 x 15.2  x 1.1
Weight (kg): 0.28