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In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.
The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)
Correct answer is '51.5'. Can you explain this answer?
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In an air-standard Otto cycle, the pressure and temperature at the be...
The properties of air at each principal state of the cycle from the given table are,
State 1: p1 = 100 kPa, T1 = 300 K
u1 = 214.07 kJ/kg, vr1 = 621.2
State 2: For isentropic compression,
vr2 = vr1 x v2 / v1 = 621.2 x 1 / 8.5 = 73.082
= 503.06 kJ/kg
State 3: The specific internal energy u3 is found using the energy balance for process 2 - 3.
qH.23 = (u3 - u2)
u3 = qH.23 + u2 = 1400 + 503.06 = 1903.06 kJ/kg
Thus, by interpolation at u3 = 1903.06 kJ/kg
= 1.9192
State 4: For the isentropic expansion,
Finally, by interpolation at vr4 = 16.3132
= 892.95 kJ/kg
and wnet = qH,23 - qH, 23 - (u4 - u1)
= 1400 - (892.95 - 214.07) = 721.12 kJ/kg
The thermal efficiency is
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In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer?
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In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer?.
In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an air-standard Otto cycle, the pressure and temperature at the beginning of compression are p1 = 100 kPa and T1 = 300 K, respectively. The cycle has a compression ratio of 8.5 and the heat addition per unit mas of air is 1400 kJ/kg. The ideal-gas properties of air are given in the table below.The thermal efficiency (in %) of the cycle will be (Answer up to one decimal place)Correct answer is '51.5'. Can you explain this answer?.
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