Q7 An engine having a compression ratio of (15:1) operates on the ideal Dualcombustion cycle. At the beginning of compression the air in the cylinder is at(0.986 bar) and (21 °C). After compression the heat energy supplied at constantvolume increases the temperature to (1100 °C), and the heat energy supplied atconstant pressure takes place over (4%) of the stroke. Calculate the maximumpressure, the maximum temperature and the cycle efficiency.Answers [69.1bar, 1870 °C, 63.8 % ]

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Answered: Q7 An engine having a compression ratio…

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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An SI engine operating at WÓT on a four-stroke air-standard cycle has cylinder conditions at the start of compression of 100F and 14.7 psia. Compression ratio is rc = 10, and the heat added during combustion is qin compression the temperature range is such that a value for the ratio of specific heats k = 1.4 would be correct. During the power stroke the temperature range is such that a value of k = 1.3 would be correct. Use these values for compression and expansion, respectively, when analyzing the cycle. Use a value for specific heat of Cv= 0.216 BTU/lbm-R, which best corresponds to the temperature range during combustion. Calculate: 800 BTU/lbm. During (a) Temperature at all states in cycle. [OF] (b) Pressure at all states in cycle. [psia] (c) Average value of k which would give the same indicated thermal efficiency value as the analysis in parts (a) and (b).
Q3: An Otto cycle has a compression ratio of (8.5) at the beginning of the com. Press ion stroke, the temperature is (300K) and the pressure is (90KPa). If the heat input is (800Kj) and the maximum temperature in the cycle is 1100K, determine (a) The mass of air in the cycle. (b)The heat rejection. (c) thermal efficiency. (d) The mean effective pressure.
Q1-A diesel engine oprerates on the dual cycle in which the heat transfer veras me to the working fluid due to combustion of fuel as (1400kj/kg), half of which is transferred at the constant volume process and the remaining half at a constant pressure process. At the beginning of the compression stroke the temperature is (25°c) and the pressure is one bay. The compression ratio is (14) Calculate the efficiency of the cycle ⑥the maximum value of pressure and temperature which occurs during the cycle and the mean effective pressure of the cycle P
A four-cylinder, four-stroke engine has a displacement volume of 300 cc (cubic centimeter) per cylinder. The compression ratio of the engine is 10 and operates at a speed of 3000 rev/min. The engine is required to develop an output of 40 kW at this speed. Calculate the cycle efficiency, the necessary rate of heat addition, the mean effective pressure, and the maximum temperature of the cycle. The inlet conditions are 1 .1bar and 30 deg.C, respectively. Analyze using the Otto cycle and Diesel cycle. Compare the results.
In a C.I. engine working on the dual combustion cycle the compression ratio is 12.5:1. Air at 101.3kPa and 35°C is compressed adiabatically. Fuel is then added until the pressure reaches 4000kPa, then at constant pressure to a temperature of 1425°C. After adiabatic expansion to the initial volume exhaust takes place. Calculate: (a). work done/kg air (b). thermal efficiency
Q4 An air standard Otto cycle has a compression ratio of (8),at the start of compression stroke, the temperature is (300K) and the pressure is (100KPa), if the maximum pressure in the cycle is (3MPa) determine (a) the heat input per Kg. (b) The cycle efficiency. (c) The mean effective pressure.
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.
Just want to compare against my answers
The swept volume of an engine working on the dual combustion cycle is 0.1068m³. The clearance volume is 8% of the swept volume. At the beginning of compression the air conditions are 100kPa and 42°C The maximum cycle conditions are 4500kPa and 1500°C. Calculate: (a). thermal efficiency (b). mean effective pressure (c). exhaust pressure (d). air-fuel ratio if the calorific value of the fuel is 43MJ/kg Assume the compression and expansion to be adiabatic. Use the standard constants for air.
DUAL CYCLE Problem. Please show your solution completely.
A compression-ignition engine with compression ratio of 14 is being designed. Pressureand temperature at the bottom dead centre are 1.3 bar and 400K. The engine operatesaccording to the standard Diesel cycle. Assume polytrophic index to be 1.33. Computepressure and temperature at the top dead centre
1. An engine operates on the air-standard diesel cycle. The condition at the start of compression are 27 degree celsius and 100kPa. The heat supplied is 1840kJ/kg, and the compression ratio is 16. Determine the maximum temperature and pressure, the thermal efficiency and the mean effective pressure. 2. Calculate the bore and stroke of a six-cylinder engine that delivers 22.4 kW at 1800 rpm with a ratio of bore to stroke of 0.71. Assume the mean effective pressure in the cylinder is 620 kPa and the mechanical efficiency is 85%. 3. A spark-ignition engine produce 224 kW whle using 0.0169 kg/s of fuel. The fuel has a higher heating value of 44 186 kJ/kg, and the engine has a compression ratio of 8. The friction power is found to be 22.4 kW. Determine the brake thermal efficiency, mechanical efficiency,and the rest of the efficiencies.

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