Q15 In an ideal Otto cycle the compression ratio is (6). The initial pressure andtemperature of the air are (1 bar) and (100 °C). The maximum pressure in the cycle is(35 bar). For (1 Kg) of air flow, calculate the values of pressure, volume andtemperature at the four salient points of the cycle. What is the ratio of heat suppliedto the heat rejected? For air, R = 0.287 Kj/Kg.K and y = 1.4.AnswersPressure, (bar)Volume, (m³)Temperature, (K)Point 111.07373Point 212.28Point 335.0ASD0.178762178 هماد داود عبود2171Point 42.841.071062

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Answered: Q15 In an ideal Otto cycle the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Refer to the following figure for an Air Standard Otto Cycle. At the beginning of compression stroke: • Volume is 0.45 m³; • Pressure is 1 bar; and • Temperature is 30°C; At the end of the compression stroke: • Pressure is 11 bar; 210 kJ of heat is added at constant volume. Assuming the cycle is reversible. T(K) = 273 +T(°C); Determine the following to the approximation. • Pressures at point 4 bar • Swept Volume= m • Maximum Temperature of the cycle = °C • Net work output of the cycle = kJ • Heat Rejected from the cycle = kJ • Thermal efficiency of the cycle = • Mean Effective Pressure = bar % p (bar) 21.48 11 V₁ = 0.45 m³ Adiabatics → V (m³)
An air-standard Diesel cycle operates with a compression ratio, r = 10:1. If the initial conditions at bdc are 1 bar and 27 °C, and the energy addition is 2000 kJ/kg of air, calculate the salient points around the cycle, and the thermal efficiency. Show that the efficiency calculated from the cycle calculation is equal to that from Eqn (3.20). Assume the compression and expansion are isentropic and K = 1.4. How does this compare with the efficiency of a Carnot cycle between the two temperature limits, and what is the value of ẞ? [45.02%; 89.07%; 3.6453]
MTQ5 At the beginning of the compression process of an air-standard Diesel cycle operating with a compression ratio of 18, the temperature is 300 K and the pressure is 0.1 MPa. The cut-off ratio for the cycle is 2 and mass flow rate in the system is 1900 kg/hr. Cp = 1.006 kJ/kg K Cv = 0.717 kJ/kg K
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2250 K. Determine the compression ratio. r =
An air-standard Diesel cycle has a maximum temperature of 1800 K. At the beginning of compression, pq =95 kPa and T1 = 300 K. The mass of air is 12 g. For a compression ratio of 15, determine (a) the net work of the cycle, in KkJ. (b) the thermal efficiency. (c) the mean effective pressure, in kPa.
An air-standard Diesel cycle has a maximum temperature of 2000 K. At the beginning of compression, p1 = 95 kPa and T1 = 300 K. The mass of air is 12 g. For a compression ratio of 20, determine:(a) the net work of cycle in kJ(b) the percent thermal efficiency.
A petrol engine with compression ratio of 11:1 was analysed as an air-standard cycle. The inlet pressure and temperature of the air are 101 kPa and 19 °C respectively while the maximum temperature of the cycle is 1,067 °C. The mass flow rate of air through the engine is 605 kg/min when running at its optimum speed. Thake the specific heat capacites at constant pressure as 1.0052 and 0.716 kJ/kgK. Calculate the power obtainable from the cycle in kilo of SI unit to 1 decimal place. Provide the units in the answer.
A turbojet-powered aircraft is flying at 220 m/s and 8000-m altitude, where the ambient temperature and pressure are 236K and 35kPa, respectively.The pressure ratio of the compressor is 6 and the turbine inlet temperaturer is 970k. Estimate the thrust developed by the engine when the air flow rate is 55kg/s. employ an air standard-cycle analysis using the constant-pressurree specific heat c_p and specific heat ratio γ for air and neglecting the fuel properties.
The compression ratio in an air standard Otto cycle is 9. At the beginning of the compression stroke, the pressure is 0.1 MPa and the temperature is 21 C. The heat transfer to the air per cycle is 2000 kJ/kg. Use the PG model for air. I am trying to find the Mean Effective Pressure from this information
Q7 The initial condition for an air-standard Otto cycle operating with acompression ratio of (8:1) are (0.95bar) and (17 °C). At the beginning of the compression stroke, the Cylinder volume is (3.8 103 m³) and (7.5Kj) of heat are added to the gas. Calculate the Pressure and temperature at the end of each process and determine the thermal efficiency and mean effective pressure of the cycle.
Q14 An air standard Otto cycle has a compression ratio of (8), temperature and pressure at the beginning of compression are (20 °C) and (1 bar) respectively. The constant volume heat addition is (1800 Kj/Kg). Calculate the maximum temperature and pressure for the cycle and the temperature at the end of the expansion process. What is the efficiency and mean effective pressure of the cycle? Take Cv = 0.7288 Kj/Kg.K and y=1.41. Answers: T3-3156.8K, P3-8622.6 KN/m², T4=1345.8K, 57.36 %, 1348.9 KN/m²
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 80 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2150 K. (a) Determine the compression ratio. r = (b) Cutoff Ratio (c) Thermal Efficiency (d) Mean Effective Pressure

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