Q48-A diesel engine working on dual combustion cycle has a compression ratio (10)and cut off ratio (15). The pressure at the beginning of compression is (2 bar) andthe maximum pressure in the cycle is (100 bar). Determine the thermal efficiency and meaneffective pressure of the cycle. Comp/nobi

Answered: Q48-A diesel engine working on dual…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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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
1. Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60°C and 98 kPa. The engine has a compression ratio of 9.5:1 and uses gasoline with AF = 15.5. Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual. Heating value of the fuel is about 44MJ/kg. Calculate: (a) Temperature at all states in the cycle. [°C] (b) Pressure at all states in the cycle. [kpa] (c) Specific work done during power stroke. [kJ/kg] (d) Heat added during combustion. [kJ/kg] (e) Net specific work done. [kJ/kg] (f) Indicated thermal efficiency. [%]
For an engine working on the ideal Dual cycle, the compression ratio is 10 and the maximum pressure is limited to 70 bar. If the supplied is 1680 kJ/kg, find tlerressures and temperatures at the vaae the cycle ane kJ yele efficiency. The pressure and temperature of air at the commencemelil Of compression are 1 bar and 100 °C respectively. Assume Cp = 1.004 kJ/kg K and Cy .e «alient points of 0.717 kJ/kg K for air.
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.
An engine working on air-standard dual cycle has compression ratio 9.the pressure and temperature at the beginning of the cycle are 1 bar and 90 degrees * C . the maximum pressure of the cycle is limited to 68 bar and total heat supplied during the cycle is 1750 kj/kg. Determine a) pressure and temperature at the end of the expansion (b) thermal efficiency (c) MEP Assume cp, cv = 1.007, 0.7 kj/kg.
Q2 A Dual combustion cycle operates with a volumetric compression ratio of (12), and with a cut-off ratio (1.615). The maximum pressure is given by [Pmax = 54 P1], where P₁ is pressure before compression. Assuming indices compression and expansion of (1.35), show that the mean effective pressure (m.e.p) of the cycle is Pm = 10 P₁
Please use appropriate format for answering word problem: An ideal cold air standard Diesel cycle has a compression ratio of 18. At the beginning of compression, air is at 95 kPa and 20 o C. If the maximum temperature during the cycle is 2000 o C, determine (a) the thermal efficiency
(b) The pressure, volume and temperature at the beginning of compression of a four stroke petrol engine are 105kN/m²,0.0005m³ and 25°C respectively. The maximum temperature of the cycle is 1400°C. The volume ratio of the engine is 8:1. i) Calculate the mean effective pressure in the cylinder.
An Otto cycle engine is operating on the following conditions: The pressure and temperature at the beginning of compression are 150 kPa and 300 K, respectively. The maximum pressure and temperature are 5100 kPa and 2900 K. Assume cold air standard. Determine: a. The compression ratio b. The net cycle work, Wnet/m (kJ/kg) c. The cycle efficiency in percent.
The stroke and cylinder diameter of a compression ignition engine are 250 mmand 150 mm respectively. If the clearance volume is 0.0004 ?^3 and fuelinjection takes place at constant pressure for 5 per cent of the stroke determinethe efficiency of the engine. Assume the engine working on the diesel cycle.
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 4 cylinder, 4 liter compcompression-ignition engine operates on the air standard dual cycle. It uses light duel fuel at air fluid ratio of 18. The compression ratio of the engine is 16:1 and cylinder bore diameter is 10cm. At the start of the compression state, conditions in the cylinders are 60°C and 100kPa with a 2% exhaust residual. It can be assumed that half of the heat input from combustion is added at constant volume and half at constant pressure. Calculate: 1. Temperature and pressure at each state of the cycle. 2. Indicated thermal efficiency 3. Exhaust temperature 4. Air temperature in intake manifold 5. Engine volumetric deficiency

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Q48-A diesel engine working on dual combustion cycle has a compression ratio (10) and cut off ratio (15). The pressure at the beginning of compression is (2 bar) and the maximum pressure in the cycle is (100 bar). Determine the thermal efficiency and mean effective pressure of the cycle. Comp/nobi