This study explains how the usual simplified formula to calculate thermal efficiency of an internal combustion engine is appears. Described Internet sites with the "reverse" design challenge – you must not to enter raw data and get a response, but you must enter formulas for calculations and verify their correctness (educational task).
Fig. 15.1. Otto cycle thermal efficiency - http://twt.mpei.ac.ru/MCS/Worksheets/PTU/otto-cycle-1.xmcd
Fig. 15.2. "Pointwise" calculation of Otto cycle thermal efficiency
Fig. 15.3. Ideal gas specific entropy calculation
Fig. 15.4. Ideal gas enthalpy calculation
Fig. 15.5. The site with the calculation and graphical display of the Otto cycle - http://twtmas.mpei.ac.ru/mas/Worksheets/Therm/Otto_anim.mcd
Fig. 15.6. Start of the test on knowledge of the calculation of the Otto cycle - http://twtmas.mpei.ac.ru/mas/Worksheets/Therm/otto_ideal_cycle_test.mcd
Fig. 15.7. End of the test on knowledge of the calculation of the Otto cycle
