Question

An ideal Otto cycle engine, an ideal Diesel cycle engine, and a Stirling engine all have a maximum volume of 1 liter. The volume at the end of combustion for the Otto and Diesel engines is 0.1 liter. The minimum volume for the Stirling engine is 0.1 liter. All three engines operate with air initially at 100 kPa, and have a minimum temperature of 300 K and a maximum temperature of 1200 K. Determine how much work is done for each cycle of the three engines and compare the thermal efficiency for each engine. Use a variable specific heat analysis using table A-17.

Really appreciate any help and especially any explanation... This class has killed me. :/

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...

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...

Consider an ideal Brayton cycle that takes in air at 5°C and 80
kPa. The combustion adds 900 kJ/kg of energy to the air. Due to
material properties of the engine, the maximum temperature in the
cycle is 1200°C. Using cold-air-standard assumptions, determine
a) The maximum permissible pressure ratio (i.e. the pressure
ratio that corresponds to the maximum temperature being
1200°C).
b) The maximum power output of the engine (i.e. the power output
at the pressure ratio found in 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...

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...

At the beginning of the compression process of an air-standard
Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 6
and the heat addition per unit mass of air is 1500 kJ/kg.
Determine: (a) the maximum temperature of the cycle, in K. (b) the
net work, in kJ/kg. (c) the percent thermal efficiency of the
cycle. (d) the mean effective pressure, in kPa.

A device uses a Stirling cycle on 378 moles of a monatomic ideal
gas between two reservoirs with temperatures of 389 K and 659 K as
a refrigerator or a heat pump. The volume of the system shifts
between 0.94 m3 and 2.44 m3.
1) How much energy does this device remove from the cold
reservoir?
2)How much energy does this device transfer into the hot
reservoir?
3)How much work is done by the device on the gas?
4)What is...

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 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...

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