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An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air at 95 kPa, temperature at 27oC and 750 kJ/kg of heat is transferred during the constant-volume heat addition process.
a) Draw and label the P-v diagram for this process. (2 marks)
b) Calculate the pressure at the end of the heat addition process in kPa. (4 marks)
c) Calculate the temperature at the end of the heat addition process in K. (4 marks)
d) Calculate the net work done in kJ/kg. (2 marks)
e) Calculate the mean effective pressure in kPa. (3 marks)
Methane (CH4) is burned completely with stoichiometric amount of air during a steady-flow combustion process. Both the reactant and the product are maintained at 25oC and 1 atm, and water in the product is in the liquid state.
a) Determine the heat transfer from the combustion chamber during this process.
b) Calculate the Air Fuel Ratio. (2 marks)
c) If the combustion was achieved with 100% excess air would your answer be different? Explain. (2 marks)
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