Question

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 (K) at state 2= 817.4

Pressure (kPa) at state 2 = 3503.1

Specific enthalpy (kJ/kg) at state 2 = 841.12

Temperature (K) at state 3 = 1307.84

Pressure (kPa) at state 3 = 3503.1

Enthalpy (kJ/kg) at state 3 = 1404.3

1. Determine the relative specific volume at state 3.

2. Determine the relative specific volume at state 4.

3. Determine the temperature (K) at state 4

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

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

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

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

8. Determine the efficiency (%) of the engine

Answer #1

answered by: anonymous

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 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...

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respectively.
T1 (K) = 333
P1 (kPa) = 170
rp = 10.7
rc = 2.54
AV (m3/s) = 1.7
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2) An air-standard Otto cycle operates with a minimum
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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
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a) Determine the thermal efficiency.
b) Determine the specific fuel consumption. (kg/kJ)
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at the end of the compression process are 300 K and 900 K
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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...

10) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
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11)An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
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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
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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...

n ideal air-standard Brayton cycle operates at steady state with
compressor inlet conditions of 290 K and 95 kPa and a fixed turbine
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determine:
(a) the exhaust temperature of the cycle, in K.
(b) the back work ratio.
(c) the net work developed per unit mass flowing, in kJ/kg.
(d) the heat addition per unit mass flowing, in kJ/kg.
(e) the thermal efficiency for the cycle.

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