Question
In: Mechanical Engineering
Prove: under the same compression ratio, the thermal efficiency of the Otto cycle is greater than...
Prove: under the same compression ratio, the thermal efficiency of the Otto cycle is greater than the thermal efficiency of the Diesel cycle?
Solutions
samet mamat answered 2 years agoRelated Solutions
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. 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 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 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...
The compression ratio of an air-standard Otto cycle is 9.5. Prior to the isentropic compression process,...
The compression ratio of an air-standard Otto cycle is 9.5.
Prior to the isentropic compression process, the air is at 100 kPa,
35°C and 600 cm3 . The temperature at the end of the isentropic
expansion process is 800 K. Using specific heat values at room
temperature (25°C), determine
(a) the highest temperature and pressure in the cycle
(b) the amount of heat transferred in during the cycle (kJ)
(c) the thermal efficiency
(d) the mean effective pressure
Part (a)...
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 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 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...
A cold air-standard Otto cycle has a compression ratio of 6 and the temperature and pressure...
A cold air-standard Otto cycle has a compression ratio of 6 and
the temperature and pressure at the beginning of the compression
process are 520°R and 14.2 lbf/in.2, respectively. The heat
addition per unit mass of air is 500 Btu/lb. Assume constant
specific heats evaluted at 520°R. Determine:
(a) the maximum temperature, in °R.
(b) the maximum pressure, in lbf/in.2
(c) the percent thermal efficiency.
(d) the mean effective pressure, in lbf/in.2
An Otto cycle having a compression ratio of 7:1 uses air as the working fluid. Initially...
An Otto cycle having a compression ratio of 7:1 uses air as the
working fluid. Initially p1 = 95 kPa,
T1 = 17 C, and V1 = 0.0038 m
3
. During the heat addition process, 7.5 kJ of heat are
added.
Determine:
(a) the heat rejected Q4-1 = __________ kJ
(b) the net work of the cycle Wnet = ________________ kJ
(c) the cycle thermal efficiency η = ________ %
(d) the mean effective pressure. MEP = __________ kPa
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