Question

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 be if the engine operates at 2500 rpm
instead?

d) * What-if Scenario:* What would the
specific fuel consumption be if the engine operates at 2500 rpm
instead? (kg/kJ)

****************************************b and d NEED TO BE IN
kg/kJ********************************

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...

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...

The following data were collected from a 4-cylinder compression
ignition engine running on diesel fuel: Ne=2,250 rpm, mf=10.1
kg/hr, Hg=45,600 kJ/kg, De=2.2L, r=16, pime=1,050 kPa, and
p1=100kPa. What is the dual-cycle efficiency of this engine? Use a
βdc of 1 and a T3/T1 ratio of 9.

A Diesel cycle engine is analyzed using the air standard
method. Given the conditions at state 1, compression ratio
(r), and cutoff ratio (rc) determine the efficiency and other
values listed below.
Note: The gas constant for air is R=0.287 kJ/kg-K.
--Given Values--
T1 (K) = 322
P1 (kPa) = 120
r = 11.5
rc = 1.6
Specific internal energy (kJ/kg) at state 1: 229.86
Relative specific volume at state 1= 520.52
Relative specific volume at state 2= 45.26
Temperature...

A Diesel cycle engine is analyzed using the air standard
method. Given the conditions at state 1, compression ratio
(r), and cutoff ratio (rc) determine the efficiency and other
values listed below.
Note: The gas constant for air is R=0.287 kJ/kg-K.
--Given Values--
T1 (K) = 322
P1 (kPa) = 120
r = 11.5
rc = 1.6
Specific internal energy (kJ/kg) at state 1: 229.86
Relative specific volume at state 1= 520.52
Relative specific volume at state 2= 45.26
Temperature...

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 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.

In an air standard diesel cycle compression starts at 100kpa and
300k. the compression ratio is 16 to 1. The maximum cycle
temperature is 2031K. Determine the thermal efficiency.
Please help
Thank you

A
diesel cycle operates with a compression ratio of 16:1. The
conditions at the beginning of compression are T= 90 F , p= 14.6
psia. The maximum volume in the cylinder is 85 in^3. The maximum
temperature in the cycle is 1740 degrees R. The cycle can be
considered ideal, except, that the compression stroke is only
polytropic with n = 1.31.
A) what is the mass of (air + fuel) in the cylinder?
B) what is the maximum pressure...

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.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 2 minutes ago

asked 2 minutes ago

asked 7 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 9 minutes ago

asked 12 minutes ago

asked 13 minutes ago

asked 13 minutes ago

asked 15 minutes ago

asked 20 minutes ago