Question

**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 temperature (K) at state 2.

c) Determine the pressure (kPa) at state 2.

d) Determine the specific enthalpy (kJ/kg) at state 2.

e) Determine the temperature (K) at state 3.

f) Determine the pressure (kPa) at state 3.

g) Determine the specific enthalpy (kJ/kg) at state 3.

h) Determine the temperature (K) at state 4.

i) Determine the pressure (kPa) at state 4.

j) Determine the specific internal energy (kJ/kg) at state 4.

k) Determine the net work per cycle (kJ/kg) of the engine.

l) Determine the heat addition per cycle (kJ/kg) of the engine.

m) Determine the efficiency (%) of the engine.

Answer #1

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...

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respectively.
T1 (K) = 333
P1 (kPa) = 170
rp = 10.7
rc = 2.54
AV (m3/s) = 1.7
a) Determine the specific enthalpy (kJ/kg) at state 1.
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1) An air-standard Otto cycle has a compression ratio of 9. At
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A Student cycle engine is analyzed using the cold air-standard
method. Given the definition of each process in the cycle,
determine the thermal efficiency of the engine for each set of
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value over the smaller one.
--Given Values--
Process 1-2 = Isentropic compression & volume
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