The compression ratio of an air-standard Otto cycle is 8. Prior to the isentropiccompression process, the air is at 100 kPa, 300 K, and 500 cm³. The temperature at theend of a polytrophic expansion process with the polytrophic exponent n=1.2 is 1200K. Using specific heat values at room temperature, determine, the thermal efficiencyand the mean effective pressure?

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Answered: The compression ratio of an…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Consider a modification of the cold air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.3. The compression ratio is 12 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 300 K and V1 = 2270 cm3. The maximum temperature during the cycle is 2000 K. Determine the heat input in kJ, for the modified cycle
A four-cylinder, two-stroke 2.4-L diesel engine that operates on an ideal Diesel cycle has a compression ratio of 22 and a cutoff ratio of 1.8. Air is at 70°C and 97 kPa at the beginning of the compression process. Using the cold-airstandard assumptions, determine how much power the engine will deliver at 4250 rpm.
plementary Exam (1 x php?attempt=D176481 At the beginning of the compression process of an ideal Diesel cycle, air is at 95 kPa and 25°C, and 640 kJ/kg of heat is transferred to air during the heat-addition process. At the end of isentropic expansion process, air is at 265 kPa and 607°C. Taking into account the variation of specific heats with temperature, the thermal efficiency of the cycle is Lütfen birini seçin: а. 30.4% b. 27.5% c. 41.2% d. 37.3% e. 43.7% Sonraki sayfa
Consider an ideal Brayton cycle using air as the working fluid, operating with a pressure ratio of 17. Air at 50 kg/s enters the compressor at 150 kPa and 700 K. The air then enters the turbine at 3000 K. Assume gas constant and specific heats at room temperature. Apply the ideal gas equation of state and isentropic relationships of ideal gas appropriately. (а) Analyse all pressures and temperatures in the cycle (b) Using values of Qin, Qout and Wnet in MW, determine the thermal efficiency of the суcle. (c) Illustrate proper P - v and T –s diagrams for the cycle, indicating all pressures and temperatures obtained in (a).
An ideal gas diesel engine, that has an inlet temperature, pressure and a compression ratio of 27 degrees Celsius,102 KPa and 18:1 respectively. The maximum cycle temperature is 1237 degrees Celsius. Take Specific heat at constant pressure and constant volume for air as 1,005 KJ/Kg K and 0,717 KJ /Kg K respectively. Calculate : 1.the absolute temperature after the isentropic expansion process to one decimal place 2.the thermal efficiency of the cycle 3.specific heat rejected and received to one decimal place and include SI unit (J/Kg...) 4.The cut off ratio
3. The p-v diagram of the cold-air-standard Atkinson cycle is shown. The cycle consists of isentropic compression, constant volume heat addition, isentropic expansion, and constant pressure compression. For a particular Atkinson cycle, the compression ratio during isentropic compression is 9.0. At the beginning of this compression process, p1 = 102 kPa and T1 = 305 K. The constant volume heat addition per unit mass of air is 1500 kJ/kg. (a) Sketch the cycle on T-s coordinates. Determine (b) the net work, in kJ per kg of air, (c) the thermal efficiency of the cycle, and (d) the mean effective pressure, in kPa.
Temperature, Pressure and Volume of air (Y=1.4) at the end of isentropic compression in an air standard Carnot heat engine cycle are 315.6 °C, 120 kPa and 0.05 m³ respectively. The volumetric ratio of the isothermal expansion (2-3) and that of isothermal compression ( V₁ ¹₁-3). The volumetric ratio the isentropic expansion (¹-6) and that of isothermal V/₂ compression (¹= 6). (Please draw a P-V diagram of the Carnot cycle) V₁ Calculate; a) The pressure, minimum Temperature and volumes of other states of the Carnot cycle. [ + b) The heat supplied and rejected by the cycle c) The efficiency of the cycle 星

Show that the air standard efficiency of a gas turbine can be expressed in terms ofpressure ratio only.
Hello Sir,Good Night.I have a question in my homework related thermodynamics lesson.The following below is my question. Please advice, thank you
Temperature after the heat addition process = K Thermal efficiency =% Mean effective pressure = kpa

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