Fundamento
Otto
Ideal efficiency rises with the compression ratio and with k.
\(\eta_{Otto}=1-r^{1-k}\)
ThermoLab · Chapter 9
Gas power cycles
Simulates Otto, Diesel, Brayton, Stirling and Ericsson cycles with live diagrams.
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Engineering results
NOT RUNDetailed calculation reportEquations · substitution · verification
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Engineering directory
13 linked modules on a single calculation base
Open any tool without losing your chosen unit system. Each page works on its own and keeps its navigation, report and export.
01
Appendices A-1 to A-28Universal property interpolator
→02Chapters 1 and 2Pressure, temperature and general energy balance
→03Chapter 3Pure substances and equations of state
→04Chapter 4Energy integrals for closed systems
→05Chapter 5Control volumes and the first law
→06Chapters 6 and 7Second law, Carnot and entropy
→07Chapter 8Exergy, destruction and second-law efficiency
→08Chapter 9Gas power cycles
→09Chapter 10Rankine steam power cycles
→10Chapter 11Refrigeration cycles
→11Chapters 12 and 13Gas mixtures and psychrometrics
→12Chapters 14 and 15Combustion and adiabatic flame temperature
→13Chapters 16 and 17Chemical equilibrium and compressible flow
→Engineering framework
Theory, equations and conditions of use
Air-standard cycles isolate the effect of compression, heat addition and expansion before real losses are introduced.
Fundamento
Diesel
Constant-pressure heat addition introduces the cut-off ratio rc.
\(\eta_D=1-\frac{1}{r^{k-1}}\frac{r_c^k-1}{k(r_c-1)}\)
Fundamento
Brayton
In the ideal cycle, the pressure ratio controls the temperature after compression and expansion.
\(\eta_B=1-r_p^{(1-k)/k}\)
Base documentalÇengel & Boles, 7th edition · SI appendices A-1 to A-28
USCS conversionA-1E to A-27E, via exact factors from the SI base
AlcancePreliminary design, teaching and independent verification
Engineering FAQ
Preguntas frecuentes
Is a higher compression ratio always better?+
Ideally it raises efficiency, but it also raises temperature, stresses and the risk of knock.
What does regeneration add?+
It recovers heat from the exhaust whenever the turbine outlet is hotter than the compressor outlet.
Does the Stirling cycle reach Carnot efficiency?+
In the ideal limit with perfect regeneration, yes.