Question

An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 95 kPa and 27°C. Accounting for the variation of specific heats with temperature, determine the total irreversibility (or lost work). Assume a source temperature is 2000 K and a sink temperature is 300 K. Show solution step by step.

Answer #1

A
diesel cycle has a compression ratio of 18 and an intake cutoff
ratio of 3. At the beginning of the compression process, the
working fluid is at 100 Kpa and 20 degrees C. assuming variation of
the specific heats find the temperature and pressure of the air in
each state, the heats of input and output per unit mass and thermal
efficiency.

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...

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...

An ideal Diesel cycle has a cut off ratio of 2. The
temperature of the air at the beginning and
at the end of the compression process are 300 K and 900 K
respectively. By utilizing constant
specific heats, taking the specific heat ratio, k = 1.4, Cp = 1.005
kJ/kg K and Cv = 0.718 kJ/kg
K. Determine the followings:
(i) The compression ratio. [5 marks]
(ii) The maximum cycle temperature. [5 marks]
(iii) The amount of heat transferred...

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.

1. The compression ratio of an air powered diesel cycle is A = 18 and the cutting ratio is B = 2.2. The pressure of the air at the beginning of the compression process is C = 94 kPa and the temperature is D = 32 ° C. Considering that the specific temperatures change with temperature (using the air standard, not the cold air standard only, that is, using the relative specific volumes from the table) and accepting the gas...

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 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...

The compression ratio of an air-standard Diesel cycle is 17 and
the conditions at the beginning of compression are p1 = 14.0
lbf/in.2, V1 = 2 ft3, and T1 = 520°R. The maximum temperature in
the cycle is 4000°R. Calculate (a) the net work for the cycle, in
Btu. Btu (b) the thermal efficiency. % (c) the mean effective
pressure, in lbf/in.2 lbf/in.2 (d) the cutoff ratio.

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...

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