Question

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 constant of the air as 0.287 kJ / kg K a-) Find the temperature at the end of the compression (T2), the temperature at the end of the heat treatment (T3) and the temperature at the end of the expansion (T4) in the K unit. (15 p) b-) Calculate the thermal efficiency of the cycle. (15 p) c-) Calculate the average effective pressure of the cycle in kPa. (10 p)

NOTE:Don't used cp and cv.

Answer #1

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...

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...

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.

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...

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.

Pressure and temperature at the beginning of compression of
compression of an air-standard (R=287 J/kgK, gamma= cp/cv=1.4).
Diesel cycle are 107kPa and 280K, respectively. At the end of the
heat addition, the pressure is 11MPa and the temperature is
2040K.
a) Determine the cut off ratio:

A Diesel cycle engine is analyzed using the cold 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 specific heat ratio and gas constant for air
are given as k=1.4 and R=0.287 kJ/kg-K respectively.
Given Values
T1 (K) = 326
P1 (kPa) = 105
r = 16.5
rc = 1.8
a) Determine the specific internal energy (kJ/kg) at state
1.
b) Determine the...

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).

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 23 minutes ago

asked 44 minutes ago

asked 44 minutes ago

asked 47 minutes ago

asked 52 minutes ago

asked 54 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago