Question

ROUND UP TO 4 DECIMAL PLACES. Draw and label the P-V & T-S diagrams.

An ideal air-standard Otto cycle engine has a compression ratio of 9. At the beginning of the compression process, the air is at 100 kPa, 27°C and 960 kJ/kg heat is supplied to the system. Determine the (a) Temperature and Pressure at each state, (b) Net work (kJ/kg), and (c) Efficiency

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...

An ideal Otto engine has a compression ratio of 10 and uses air
as the working fluid. The state of air at the beginning of the
compression process is 100 kPa and 27 0C. The maximum
temperature in the cycle is 2100K. (R=0.287 for air) (using
variable specific heat)
Draw the P-v diagram of the Otto cycle
Determine the specific internal energies at the beginning and
the end of the compression,
Determine the specific internal energies before and after the...

An ideal Otto cycle has a compression ratio of 7. At the
beginning of the compression process, P1 = 90 kPa, T1 = 27°C, and
V1 = 0.004 m3. The maximum cycle temperature is 1147°C. For each
repetition of the cycle, calculate the heat rejection and the net
work production. Also, calculate the thermal efficiency and mean
effective pressure for this cycle. Use constant specific heats at
room temperature. The properties of air at room temperature are cp
= 1.005...

In case your selection was a gasoline engine, evaluate the
performance of a four-cylinder four-stroke engine that operates on
the ideal Otto cycle and has a compression ratio of 11. At the
beginning of the compression process, the air is at 90 kPa and
27°C, and 500 kJ/kg of heat is transferred to air during the
constant-volume heat-addition process. Accounting for the variation
of specific heats of air with temperature, determine the required
power the engine will deliver at 3000...

Consider an ideal Ericsson cycle with air as the working fluid
executed in a steady-flow system. Air is at 27°C and 110 kPa at the
beginning of the isothermal compression process, during which 150
kJ/kg of heat is rejected. Heat transfer to air occurs at 950 K.
The gas constant of air is R = 0.287 kJ/kg·K.
a.)The maximum pressure in the cycle is? kPa
b.)The net work output per unit mass of air is? kJ/kg
c.)The thermal efficiency of...

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...

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.

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

In an ideal standard dual cycle, the pressure and temperature at
the beginning of compression are 1 bar and 47°C, respectively. The
heat supplied in the cycle is 1250kJ/kg, two third of this heat is
being added at constant volume and the remaining heat is added at
constant pressure. If the compression ratio is 16, determine
1)the maximum temperature in the cycle.
2)the thermal efficiency of the cycle.
3)the mean effective pressure.

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