first 2 parts please A2Answer ALL parts (a)-(c).A van is powered by a 2.3 litre diesel engine, which has a compression ratio, r = 8,the temperature just after combustion is 1250 K and air is drawn into the engine at300 K at a pressure of 101 kPa. At 2500 rpm the engine produces 85 kW of power.You may assume that the working fluid in the engine is an ideal gas and that R, =0.287 kJ/kg/K and y = 1.4.(a)Determine the cut-off ratio, re, the thermal efficiency and the specific heataddition for the engine.(b)A turbocharger is connected to the air intake for the engine and at 2500 rpm,it increases the air pressure at the intake by a factor of 2.8. Assume that thisis an adiabatic compression, and that the specific heat addition andcompression ratio of the engine remains unchanged. Determine the enginepower with the turbocharger.(c)Explain why diesel engines tend to have higher thermal efficiencies thanpetrol engines and why do diesel engines experience less engine wear thanpetrol engines.

Given:Compression ratio (r) = 8Temperature after combustion (T2) = 1250 KTemperature before…

Answered: A van is powered by a 2.3 litre diesel…

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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I only need help with letter (d). The answer for letter (a) is 22.87. The answer for letter (b) is 1.9538. The answer for letter (c) is 66.71%. The pressure and temperature at the beginning of compression of a cold air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 MPa and the temperature is 2050 K. Assume constant specific heats evaluated at 300 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.
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 ?
An Otto cycle uses air as its working fluid. The compression ratio of the cycle is 10. 1,800 kJ/kg of heat is added during the heat addition process. If the temperature and pressure at the end of compression are 444C and 2,168Kpa. Assume constant specific heats for the analysis, determine (a) the temperature and pressure at the end of each process, (b) the thermal efficiency of the process (c) the net Work of the cycle (d)mean effective pressure of the cycle.
An air standard diesel cycle has a compression ratio of 13 and a peak combustion temperature of 1681.55 C. If the heat rejected by the engine amounts to 3kW, determine the theoretical output power that can be produced by the engine.
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginning of the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats with temperature. 1)Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines 2)Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines
A Volkswagen Passat has a six-cylinder Otto-cycle engine with compression ratio r = 10.6. The diameter of each cylinder, called the bore of the engine, is 82.5 mm. The distance that the piston moves during the compression, called the stroke, is 86.4 mm. The initial pressure of the air-fuel mixture is 8.50 x 104 Pa, and the initial temperature is 300 K (the same as the outside air). Assume that 200 J of heat is added to each cylinder in each cycle by the burning gasoline, and that the gas has Cv = 20.5 J/mol K and y=1.40. Calculate the total work done in one cycle in each cylinder of the engine, and the heat released when the gas is cooled to the temperature of the outside air.
A turboprop aircraft propulsion engine operates where the air is at 8 psia and −10°F, on an aircraft flying at a speed of 600 ft/s. The Brayton cycle pressure ratio is 10, and the air temperature at the turbine inlet is 940°F. The propeller diameter is 10 ft and the mass flow rate through the propeller is 20 times that through the compressor. Determine the thrust force generated by this propulsion system. Assume ideal operation for all components and constant specific heats at room temperature.
An engine operates on the open otto cycle and has a compression ratio of 7.5. the air fuel ratio is 30 kgair/kgfuel, and the engine uses gaseous octane with a LHV of 44232 KJ/kg. The air enters the engine at 27 degree C and 100 kpa. Determine the work per kilogram of air and the thermal efficiency of the engine. Show the PV or TS diagram and show the complete solutions and formula used.
One kilogram of a perfect gas (air) is used as a working substance in a Carnot power cycle. At thebeginning of isentropic compression, the temperature is 326 o K and the absolute pressure is 359 kPa. Theabsolute pressure at the end of the isentropic compression is 1,373 kPa. For this cycle, the isothermalexpansion ratio (v 3 /v 2 ) is 2.0. For the cycle, calculate the heat supplied, kJ/kg.A., heat rejected, and the network
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8. Determine the (a) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Also, (b) show the T-s and P-? diagrams. Note that the specific heats are NOT constant.
At the beginning of the compression process of an air—standard Diesel cycle operating with a compression ratio of 18, the temperature is 300 K and the pressure is 0.1 MPa. The cutoff ratio for the cycle is 2. Determine (a) the maximum temperature and pressure at the cycle. (b) Determine the thermal efficiency, (c) Determine the mean effective pressure, in atm.
An ideal diesel cycle powered by air has a compression ratio of 20. At the beginning of the compression process, the pressure of the air is 100 kPa, the temperature is 20 °C and the highest temperature of the cycle must not exceed 2250 K. Show the cycle in the P-v diagram.Then calculate: a) The heat entering and leaving the cycle, the thermal efficiency of the cycle, b) the average effective pressure of the cycle. Assume that specific heat is constant at room temperature constant at temperature. k=1.4 CP=1.005 kJ/kgK CV=0.718 kJ/kgK R=0.287 kJ/kgK

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