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 air-standard dual cycle has a compression ratio of 8.6 and displacement of Vd = 2.2 L. At the beginning of compression, p1 = 95 kPa, and T1 = 290 K. The heat addition is 4.5 kJ, with one quarter added at constant volume and the rest added at constant pressure. T2 = 670K T3 = 1152K T4 = 2139 K T5 = 1339K FIND: b) the net work of the cycle, in kJ.c) the power developed at 3000 cycles per minute, in kW.d) the thermal efficiency.e) the mean effective pressure, in kPa.
Get the Compression Ratio, Expansion ratio and Pressure ratio
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).
5. An ideal diesel cycle has a compression ratio of 16 to 1. The maximum cycle temperature is1700°C and the minimum cycle temperature is 15°C. Calculate:a. the specific heat transfers to the cycleb. the specific work of the cyclec. the thermal efficiency of the cycle
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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.
3. An engine working on the Otto Cycle has a compression ratio of 10/. At the beginning of the compression stroke the temperature of the air is 30°C. After the addition of heat constant volume the temperature of the air rises to 1100 °C. Find the heat supplied, heat rejected & the net work done per kilogram of air in the cylinder. What is the efficiency of the cycle?
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An old diesel truck engine starts compression with air at a temperature of 380R and a pressure of 13 psi. The maximum temperature of the cycle does not exceed 3850 RTo protect the plunger at the end of heat addition, if the specific heats vary with temperature and the compression ratio is 18, calculate the following:1. The thermal efficiency of the cycle.2. Amount of heat introduced and rejected during the cycle.3. The intake shutdown ratio.4. Generate the P-v and T-s Charts with all the data.
Q₁) In an ideal otto cycle engine, the temperature and Pressure at the beginning of Compression are 43 C 100 kpa respectively and the temperature at the end of adiabatic Compression is 323%. if the temperature. at the end of Gnstant Volume heat addition is 1500°C calculate: (a) the Compression ratio, (b) the air- standard efficiency, (c) the temperature and pressure at the end of adiabatic expansion. Assume Yas 1.4 Por 2
A spark – ignition engine has a compression ratio of 8.5 and a maximum temperature of 945.15K. At the beginning of compression stroke, P and T of the fluid are 0.1 MPa and 28.65 deg C. Assuming hot air-standard analysis, how much work (kJ/lb) is produced per cycle completion?
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.

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