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(Solution Download) Otto Cycle

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QUESTION 1

 

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)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


QUESTION 2

 

 

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.

 

 

(11 marks)

 

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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This question was answered on: Oct 24, 2017

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