1. Intake air into a 4-stroke, 4-cylinder otto engine is 100 kPa, 21°C with an air-fuel ratio of 15. The heating value offuel is 43,966 kJ/kg. The ideal cycle efficiency is 50%. The actual engine has a volumetric efficiency of 75%. Thepiston speed is 816 m/min at 4000 rpm. Stroke-to-bore ratio is 1.1, and brake engine efficiency is 55%. Use hotair std. k = 1.33. For air, R = 287.08 J/kg K. Find (a) combustion pressure in bar (b) shaft torque in N-m (c) brakethermal efficiency in % (d) brake mean effective pressure in bar

Answered: Image /qna-images/answer/e9080e63-967c-4bdc-9e9a-720eda068603.jpg

Answered: 1. Intake air into a 4-stroke,…

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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Given the same compression ratio for both air standard Otto and air standard Diesel cycle, which cycle has higher thermal efficiency? Answer the same question this time for the Otto cycle versus the Brayton cycle
At the beginning of the compression process of 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 the mass flow rate in the system is 1900 kg/hr. Cp=1.006 kJ/kg K Cv= 0.717 kJ/kg K 1) calculate the thermal efficiency of the cycle in %? 2) which formula should be used to determine the thermal efficiency of the cycle ?
At the beginning of the compression process of 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 the mass flow rate in the system is 1900 kg/hr. Cp= 1.006 kJ/kg K Cv= 0.717 kJ/kg K 1) which figure represents the diagram for the process 2) which formula should be used to determine the temperature after compression? 3) calculate the temperature after isentropic compression in the presentable unit 4)which formula should be used to determine the temperature after heating? 5) calculate the temperature after isentropic compression in the presentable unit? 6) calculate the temperature after isentropic expansion in the presentable unit? 7) calculate the pressure after compression in kPa ? 8) which formula should be used to determine the work output of the engine? 9) calculate the work output of the engine kW? 10) calculate the thermal efficiency of the cycle in %? 11) which…
Calculate the efficiency of an Diesel cycle assuming Cold Air-Standard Analysis operating in air (k= 1.4) with a compression ratio of 20 and a cutoff ratio of 1.7? (Enter your answer as a percent to the nearest 1/10th)
From a Brayton cycle, the air entering the compressor has a temperature of 300 K, a pressure of 100 kPa and an air flow rate of 6 kg/s. The compressor pressure ratio is 10. The temperature of the working fluid entering the turbine is 1400 K. The efficiency of the turbine and compressor is 80% and the efficiency of the regenerator is 80%. Calculate A. thermal efficiency, B. workback ratio, C. power produced
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 1950 K. Determine: (a) the compression ratio, r. (b) the cutoff ratio, rc. (c) the thermal efficiency of the cycle, ?th (%). (d) the mean effective pressure, mep (kPa).
A high performance four-stroke SI engine has swept a volume of 875cm3 and a compression ratio of 8:1. The indicated efficiency is 55% of the corresponding ideal air-standard Otto cycle. At 5000rpm, the mechanical efficiency is 85%, and the volumetric efficiency is 90%. The air/ fuel ratio is 11:1 and the calorific value of the fuel is 44MJ/kg. The air is inducted at 200C and 1 bar. Calculate: The overall efficiency; Air mass flow rate; Power output; and Bmep
01 Two engines are to operate on Otto and Diesel cycles with the following data: Maximum temperature 1400 K, exhaust temperature 700 K. State of air at the beginning of compression 0.1 MPa, 300 K. Estimate the compression ratios, the maximum pressures, efficiencies, and rate of work outputs (for 1 kg/min of air) of the respective cycles.
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 100 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2050 K. Determine a. the compression ratio. b. the cutoff ratio. c. the thermal efficiency of the cycle. d. the mean effective pressure, in kPa.
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 100 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2050 K. Determine:(a) the compression ratio.(b) the cutoff ratio.(c) the percent thermal efficiency of the cycle.(d) the mean effective pressure, in kPa.
1. An ideal air-standard diesel cycle with inlet conditions: 21.11˚C and 14.7 psia, 700 Btu/lbm heat input, and a compression ratio of 15. Find P2, T2, T3, V3, P4, T4, and the efficiency of the cycle. Take Note: Assume air standard values for R and k Cp = kR/k-1 Cv = R/k-1 a. Find the value of P2. (in psi or lb/in^2) b. Find the value of T2. (in Rankine) c. Find the value of T3. (in Rankine) d. Find the value of V3. (in ft^3/lbm) e. Find the value of P4. (in psi or lb/in^2) f. Find the value of T4. (in Rankine) g. Find the value of efficiency of the cycle. (ex. 100-%)
Air enters the compressor of an ideal air standard Brayton cycle at 100 kPa, 290 K, with a mass flow rate of 6 kg/s. The compressor pressure ratio is 10. The turbine inlet temperature is 1500 K. If a regenerator with an effectiveness of 70% is incorporated in the cycle, determine (i)turbine work, (ii) compressor work, (iii) heat supplied, and (iv) the efficiency of the cycle. Draw a suitable block diagram and T-s diagram. Take Cp=1.005 kJ/kg K and ϒ= 1.4

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