3. Assume an Otto cycle with compression ratio of CR = 9 : 1. The intake air is at 100kPa, 20oC, and the volume of the chamber is 500cm3 prior to the compression stroke. The temperature at the end of the adiabatic expansion is T4 = 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is cp = 1.01KJ/kgK. Specific heat capacity at constant volume of air at atmospheric pressure and room temperature: cv = 0.718KJ/kgK. Calculate:
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Assume an Otto cycle with compression ratio of CR = 9 : 1. The intake air is at 100kPa, 20oC, and the volume of the chamber is 500cm3 prior to the compression stroke. The temperature at the end of the adiabatic expansion is T4 = 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is cp = 1.01KJ/kgK. Specific heat capacity at constant volume of air at atmospheric pressure and room temperature: cv = 0.718KJ/kgK. |
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Calculate: |
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(i) |
the mass of the intake air; |
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(ii) |
the temperature T3; |
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(iii) |
the pressure p3; |
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(iv) |
the amount of heat added by burning fuel-air mixture; |
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(v) |
the thermal efficiency of the cycle; |
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(vi) |
the mean effective pressure (MEP). |
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