Question

10) An air-standard Otto cycle has a compression ratio of 9. At the beginning of the compression process, the temperature is 20°C, and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine the cycle efficiency, work output, and the heat rejected.

11)An air-standard Otto cycle operates with a minimum temperature of 300 K and a maximum temperature of 1700 K. The compression ratio of the cycle is 7. At the beginning of the compression process, the pressure is 105 kPa. Calculate P, V, and T at each point in the cycle, the mean effective pressure, and the thermal efficiency of the cycle.

12)An air-standard Diesel cycle has a compression ratio of 22

and a cut-off ratio of 2.2. Determine the thermal efficiency of

the cycle.

13)An air-standard Diesel engine has 1000 kJ/kg added as heat.

At the beginning of the compression, the temperature is

20°C, and the pressure is 150 kPa. If the compression ratio is

20, determine the maximum pressure and temperature in

the cycle.

14)An ideal Stirling engine using air as the working fluid

operates between temperature limits of 300 and 2000 K.

Determine the thermal efficiency of the cycle.

15) Consider an ideal Ericsson cycle with air as the working

fluid executed in a steady-flow system. Air is at 270C and

120 kPa at the beginning of the isothermal compression

process, during which 150 kJ/kg of heat is rejected. Heat

transfer to air occurs at 1200 K. Determine the thermal

efficiency of the cycle and net work output per unit mass of

air.

Answer #1

1) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected
2) An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the...

At the beginning of the compression process of an air-standard
Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 6
and the heat addition per unit mass of air is 1500 kJ/kg.
Determine: (a) the maximum temperature of the cycle, in K. (b) the
net work, in kJ/kg. (c) the percent thermal efficiency of the
cycle. (d) the mean effective pressure, in kPa.

The compression ratio in an air-standard Otto cycle is 8. At the
beginning of the compression stroke the pressure is 14.7 lbf/in2
and the temperature is 600F. The heat transfer to the air during
the combustion process per cycle is 800 Btu/lbm. Determine: (a) The
pressure and temperature at the end of each process of the cycle.
(b) The thermal efficiency (use k = 1.4, Cv = 0.171 Btu/lbm
0F).

The compression ratio in an air-standard Otto cycle is 8. At the
beginning of the compression stroke the pressure is 14.7 lbf/in2
and the temperature is 600F. The heat transfer to the air during
the combustion process per cycle is 800 Btu/lbm. Determine: (a) The
pressure and temperature at the end of each process of the cycle.
(b) The thermal efficiency (use k = 1.4, Cv = 0.171 Btu/lbm
0F).

An ideal Otto cycle has a compression ratio of 7. At the
beginning of the compression process, P1 = 90 kPa, T1 = 27°C, and
V1 = 0.004 m3. The maximum cycle temperature is 1147°C. For each
repetition of the cycle, calculate the heat rejection and the net
work production. Also, calculate the thermal efficiency and mean
effective pressure for this cycle. Use constant specific heats at
room temperature. The properties of air at room temperature are cp
= 1.005...

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...

Consider a cold air-standard Diesel cycle. At the beginning of
compression, 102 kPa, and 300 K. The mass of air is 0.120 kg, the
compression ratio is 16, and the cut-off ratio is 2.0
For a cold air-standard analysis use the following values: cp =
1.005 kJ/kgK, cv = 0.718 kJ/kgK, k=1.40, M=28.97 kg/kmol.
Determine the following :
(a) pressure at end of compression stroke, in kPa
(b) temperature at end of compression stroke, in K
(c) maximum temperature in...

A diesel engine operates at 3000 rpm on a standard Diesel cycle
has a compression ratio of 14. The state of air at the beginning of
the compression process is 98 kPa and 24 ?C. The maximum
temperature in the cycle is not exceed 1850 ?C. Assume diesel fuel
has a heating value of 45 MJ/kg. Use the PG model.
a) Determine the thermal efficiency.
b) Determine the specific fuel consumption. (kg/kJ)
c) What-if Scenario: What would the
thermal efficiency...

A Diesel cycle has a compression ratio of 12 and cut-off ratio
of 2. At the beginning of the isentropic-compression process, the
pressure and temperature are 100 kPa and 35°C (308 K),
respectively. During the constant-pressure process, heat is added
to the working fluid from a reservoir at a temperature of 1760°C
(2033 K). During the constant volume process, heat is rejected to
the environment, which is at 30°C (303 K) and 100kPa. For the air
involved, it may be...

At the beginning of the compression process of an air-standard
Diesel cycle operating with a compression ratio
of 20, the temperature is 350 K and the pressure is 0.15 MPa.
The cutoff ratio for the cycle is 1.5. Determine
(a) the temperature and pressure at the end of each process of
the cycle, (b) the thermal efficiency, (c) the mean
effective pressure, in MPa.

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