Question
In: Mechanical Engineering
An ideal diesel engine has a compression ratio of 20 and uses air as the working...
An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compressor process is 100 kpa and 27 C. The maximum temperature in the cycle is 2200 K and the cutoff ratio is 1.2
Determine the following:
The internal energies at the beginning and the end of the compression
The enthalpy before and end of the combustion
The internal energy before and end of the expansion
The heat input, heat rejection and network output
The thermal efficiency
Solutions
samet mamat answered 2 years agoRelated Solutions
An ideal diesel engine has a compression ratio of 20 and uses air as the working...
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the beginning of the compression process is 95 kPa and 200C. If the
maximum temperature in the cycle
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Determine:
a) The thermal efficiency, and
b) The mean effective pressure, and
Assume constant specific heats for air at room temperature.
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An ideal Otto engine has a compression ratio of 10 and uses air
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compression process is 100 kPa and 27 0C. The maximum
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Draw the P-v diagram of the Otto cycle
Determine the specific internal energies at the beginning and
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Determine the specific internal energies before and after the...
The compression ratio of an ideal air-powered Diesel cycle is 20. At the beginning of the...
The compression ratio of an ideal air-powered Diesel cycle is
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 is required not to exceed 2250 K. Show the
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room temperature.
k=1.4 CP=1.005 kJ/kgK CV=0.718 kJ/kgK R=0.287 kJ/kgK
a) Calculate the temperatures entering and leaving the cycle,
the thermal efficiency of...
An ideal diesel engine uses air as the working fluid and operates with a thermal efficiency...
An ideal diesel engine uses air as the working fluid and operates
with a thermal efficiency ?th =0.5 with a rate of heat addition
Qin=120 kW. The temperature at the beginning and the end of the
addition heat (combustion) are respectively: T2=900 K and T3=2100
K. Assume constant specific heats (Cp and Cv). The air properties
at a room temperature T1=293.0 K are: Cp=1.005 kJ/kg.K,
Cv=0.718KJ/kg.K, the gas constant of air is R=0.287 kJ/kg.K and the
ratio of specific heats...
A Diesel engine with a compression ratio of 16 has a cutoff ratio of 1.5. The...
A Diesel engine with a compression ratio of 16 has a cutoff
ratio of 1.5. The state before polytropic compression (exponent
1.3) is 1700 cm3 , 96 kPa and 22°C and there is isentropic
expansion.
(a) Sketch the P-v diagram for this cycle.
(b) Calculate the heat transfer in and heat transfer out.
answer must be Qin = 657 J or 724 J or 866 J, Qout = 291 J or
296 J or
(c) Determine the thermal efficiency.
answer...
A Diesel engine with a compression ratio of 16 has a cutoff ratio of 1.5. The...
A Diesel engine with a compression ratio of 16 has a cutoff
ratio of 1.5. The state before polytropic compression (exponent
1.3) is 1700 cm3, 96 kPa and 22°C and there is isentropic
expansion.
(a) Sketch the P-v diagram for this cycle.
(b) Calculate the heat transfer in and heat transfer out.
(c) Determine the thermal efficiency.
(d) Calculate the mean effective pressure.
The compression ratio is 8 in an engine working with the ideal Otto cycle. The heat...
The compression ratio is 8 in an engine working with the ideal Otto cycle. The heat transfer to the engine takes place from a heat source at a temperature of 1000 ° C and the heat transfer from the engine to the outside takes place in the environment of 20 ° C and 100 kPa. At the start of the isentropic compression process, the temperature is 50 ⁰C and the pressure is 110 kPa. The temperature at the end of...
A diesel engine has a compression ratio of 19. The lowest pressure of the bike is...
A diesel engine has a compression ratio of 19. The lowest pressure of the bike is 250 kPa, the lowest
the temperature is 180 ºC and the heat supply is 1200 kJ / kg.
(a) Draw a principle image of the engine. (1p)
(b) Draw a T-s and a P-v diagram with numbered points for the cycle (1p)
(c) Set up at least one table of given input for relevant points (1p)
The table can also be filled in with...
3. The compression ratio of the ideal air-powered diesel cycle is 14, while the cutting rate...
3. The compression ratio of the ideal air-powered diesel cycle
is 14, while the cutting rate is 1.8.Since the air was initially at
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a. Pressure and temperature at the end of the heat transfer
process
b. Thermal efficiency
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A diesel engine has an inlet at 100 kPa, 310 K and a compression ratio of...
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compression ratio of 21:1. The combustion releases 1400 kJ/kg. Find
the cycle efficiency and mean effective pressure.
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