The power cycle for an internal combustion engine can be idealized as a reversible Otto cycle...

 

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The power cycle for an internal combustion engine can be idealized as a reversible Otto cycle operating with air. The engine in this study has a compression ratio r = 9 and the intake pressure that is slightly above atmospheric pressure, P = 101 kPa and a temperature equal to T = 300 K. Also, you know that the combustion adds 2000 kJ/kg of air. Please answer the following. a. Sketch the cycle processes on a P-v and T-s diagrams. b. Using the method of the cold air standard, determine the cycle thermal efficiency. c. Using the method of variable specific heats determine the maximum temperature for the cycle. d. Using the method of variable specific heats determine the maximum pressure for the cycle. e. Using the method of variable specific heats determine the temperature and pressure at the end of the power stroke. f. Use your results in parts (c) to (e) to compute the thermal efficiency of the cycle, compare your result against your result for part (b). What is the main difference for any differences that you observe? The power cycle for an internal combustion engine can be idealized as a reversible Otto cycle operating with air. The engine in this study has a compression ratio r = 9 and the intake pressure that is slightly above atmospheric pressure, P = 101 kPa and a temperature equal to T = 300 K. Also, you know that the combustion adds 2000 kJ/kg of air. Please answer the following. a. Sketch the cycle processes on a P-v and T-s diagrams. b. Using the method of the cold air standard, determine the cycle thermal efficiency. c. Using the method of variable specific heats determine the maximum temperature for the cycle. d. Using the method of variable specific heats determine the maximum pressure for the cycle. e. Using the method of variable specific heats determine the temperature and pressure at the end of the power stroke. f. Use your results in parts (c) to (e) to compute the thermal efficiency of the cycle, compare your result against your result for part (b). What is the main difference for any differences that you observe?