Question
In: Mechanical Engineering
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 730 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R = 0.287 kJ/kg·K.
Determine:
(a) the pressure and temperature at the end of the heat addition process
(b) the net work output
(c) the thermal efficiency
(d) the mean effective pressure for the cycle.
Solutions
samet mamat answered 1 year agoRelated Solutions
An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8. At the
beginning of the compression process, air is at 95 kPa and 27°C,
and 900 kJ/kg of heat is transferred to air during the
constant-volume heat-addition process. Taking into account the
variation of specific heats with temperature, determine
(a) the pressure and temperature at the end of the
heat-addition process, (b) the net work output,
(c) the thermal efficiency, and (d) the mean
effective pressure for the cycle
An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 7. At the
beginning of the compression process, air is at 98 kPa, 30oC and
766 kJ/kg of heat is transferred to air during the constant-volume
heat addition process. Determine (a) the pressure (p3) and
temperature (T3) at the end of the heat addition process, (b) the
net work output, (c) the thermal efficiency and (d) the mean
effective pressure for the cycle. Use the IG model
An ideal Otto cycle has a compression ratio of 8.5 At the beginning of the compression...
An ideal Otto cycle has a compression ratio of 8.5 At the
beginning of the compression process, air is at 98 kPa and 27∘C, If
the Tmax cannot exceed 2300K and 3e-5 kg of. assuming constant
specific heats at ambient temperature, determine (a) the pressure
and temperature at the end of each process. (b) the net work
output, (c) the thermal efficiency, and (d) the mean effective
pressure for the cycle.
An ideal cold air-standard Otto cycle has a compression ratio of 9.2. At the end of...
An ideal cold air-standard Otto cycle has a compression ratio of
9.2. At the end of the expansion process, the pressure is 110 psi,
the temperature is 1020 °R and the specific volume is 3.435
ft3/lbm. The heat rejection from the cycle is 92 BTU/lbm of air.
Evaluate specific heat at 100 °F and calculate the following by
hand: What is the mean effective pressure (psi)? The correct answer
is 231.8 psi. Show every step and calculation with units
necessary.to...
The compression ratio is 10 in the air standard Otto cycle. Pressure at the beginning of...
The compression ratio is 10 in the air standard Otto cycle.
Pressure at the beginning of the compression stroke is 1XY kPa and
the temperature is 15 ºC. The heat transfer to the air for each
cycle is 18XY kJ / kg air. Draw the T-s and P-v diagrams. (x=9
y=8).
Note: Accept that specific temperatures do not change with temperature. Take k = 1.4 and Cp = 1.0031 kJ / kg-K.
a)
For question 1, we draw the temperature...
An air-standard Otto cycle operates with a compression ratio of 8. At the start of the...
An air-standard Otto cycle operates with a compression ratio of
8. At the start of the compression stroke, the pressure is 15 psia
and the temperature is 80 degrees F. The maximum pressure in the
cycle is 550 psia. Find a) the thermal efficiency of the cycle, b)
the specific volume at the start of the compression stroke, c) the
specific volume at the end of the compression stroke, and d)
maximum temperature in the cycle.
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
cycle in the P-v diagram. Accept specific temperatures constant at
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 Otto engine has a compression ratio of 10 and uses air as the working...
An ideal Otto engine has a compression ratio of 10 and uses air
as the working fluid. The state of air at the beginning of the
compression process is 100 kPa and 27 0C. The maximum
temperature in the cycle is 2100K. (R=0.287 for air) (using
variable specific heat)
Draw the P-v diagram of the Otto cycle
Determine the specific internal energies at the beginning and
the end of the compression,
Determine the specific internal energies before and after the...
At the beginning of compression of an ideal Diesel cycle the gas has a temperature and...
At the beginning of compression of an ideal Diesel cycle the gas
has a temperature and pressure of 400C and 90
kN/m2, respectively. The volume ratio of compression is
16:1. The maximum temperature of the cycle is 14000C.
Determine, for the cycle,
the pressure and temperature at each of the cycle process
change points,
[8]
the work done/kg gas,
[4]
the thermal efficiency,
[4]
the work ratio,
[3]
the mean effective pressure,...
An ideal dual cycle has a compression ratio of 15 and a cutoff ratio of 1.4....
An ideal dual cycle has a compression ratio of 15 and a cutoff
ratio of 1.4. The pressure ratio during constant-volume heat
addition process is 1.1. The state of the air at the beginning of
the compression is P1 = 98 kPa and T1 = 24°C.
Calculate the cycle’s net specific work, specific heat addition,
and thermal efficiency. Use constant specific heats at room
temperature.
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