9.1 An air-standard Otto cycle has a compression ratio of 8.5. At the beginning of compression, p1= 100 kPa and T1 = 300 K. The heat addition per unit mass of air is 1400 kJ/kg. Determine (a) the net work, in kJ per kg of air. (b) the thermal efficiency of the cycle. (c) the mean effective pressure, in kPa.
9.1 An air-standard Otto cycle has a compression ratio of 8.5. At
the beginning of compression, p1= 100 kPa and T1 = 300 K.
The heat addition per unit mass of air is 1400 kJ/kg. Determine
(a) the net work, in kJ per kg of air.
(b) the thermal efficiency of the cycle.
(c) the mean effective pressure, in kPa.
(d) the maximum temperature in the cycle, in K.
9.2 Solve Problem 9.1 on a cold air-standard basis with specific
heats evaluated at 300 K.
9.3 At the beginning of the compression process of an air standard Otto
cycle, p1 1 bar, T1 290 K, V1 400 cm3. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine
(a) the heat addition, in kJ.
(b) the net work, in kJ.
(c) the thermal efficiency.
(d) the mean effective pressure, in bar.
9.4 Solve Problem 9.3 on a cold air-standard basis with specific heats
evaluated at 300 K.
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