a) Explanation Draw the P − v diagram for an Otto cycle as shown in Figure (1). Write the expression of thermal efficiency of the given Otto cycle ( η th ) . η th = 1 − 1 r k − 1 (I) Here, the compression ratio of air is r , and the specific heat ratio of air is k . Conclusion: From Table A-2a, “Ideal-gas specific heats of various common gases”, obtain the following values of air at room temperature. c p = 1.005 kJ / kg ⋅ K c v = 0 b) To determine The thermal efficiency of the Otto cycle with variable specific heats.

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ISBN: 8220106796979

Author: CENGEL

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Chapter 9.12, Problem 160RP

To determine

The thermal efficiency of the given Otto cycle with constant specific heat.

To determine

The thermal efficiency of the Otto cycle with variable specific heats.

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Chapter 9.12, Problem 159RP

Chapter 9.12, Problem 161RP

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An Otto cycle with a compression ratio of 8 begins its compression at 94 kPa and 10°C. The maximum cycle temperature is 900°C. Utilizing air-standard assumptions, determine the thermal efficiency of this cycle using constant specific heats at room temperature.

An Otto cycle uses air as its working fluid. The compression ratio of the cycle is 10. 1,800 kJ/kg of heat is added during the heat addition process. If the temperature and pressure at the end of compression are 444C and 2,168Kpa. Assume constant specific heats for the analysis, determine (a) the temperature and pressure at the end of each process, (b) the thermal efficiency of the process (c) the net Work of the cycle (d)mean effective pressure of the cycle.

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 800 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg.K. Determine the pressure and temperature at the end of the heat-addition process. (You must provide an answer before moving on to the next part.) The pressure at the end of the heat-addition process is The temperature at the end of the heat-addition process is 0 kPa. 이 OK.

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EBK THERMODYNAMICS: AN ENGINEERING APPR

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The thermal efficiency of the given Otto cycle with constant specific heat.

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The thermal efficiency of the given Otto cycle with constant specific heat.

The thermal efficiency of the Otto cycle with variable specific heats.

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