Question

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 720 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. (a) Determine the pressure and temperature at the end of the heat-addition process. (b) Determine the net work output. (c) Determine the thermal efficiency. (Consider the variation of specific heats with temperature or constant specific heats at room temperature.) The gas constant of air is R = 0.287 kJ/kg·K. The properties of air at room temperature are cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.

          An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 720 kJ/kg of heat is transferred to air during the constant-volume heat-addition process.
(a) Determine the pressure and temperature at the end of the heat-addition process.
(b) Determine the net work output.
(c) Determine the thermal efficiency.
(Consider the variation of specific heats with temperature or constant specific heats at room temperature.)
The gas constant of air is R = 0.287 kJ/kg·K.
The properties of air at room temperature are cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 720 kJ/kg of heat is transferred to air during the constant-volume heat-addition process.
(a) Determine the pressure and temperature at the end of the heat-addition process.
(b) Determine the net work output.
(c) Determine the thermal efficiency.
(Consider the variation of specific heats with temperature or constant specific heats at room temperature.)
The gas constant of air is R = 0.287 kJ/kg·K.
The properties of air at room temperature are cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.

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