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Name the main features of a Carnot cycle
0.5 kg of air executes a carnot cycle having a thermal efficiency of 50%. The heat transfer to the air during the isothermal expansion is 40 kJ. At the beginning of the isothermal expansion, the pressure is 7 bar and the volume is 0.12 m3. Determine:
i) The maximum and minimum temperature of the cycle in K.
ii) The volume of air at the end of isothermal expansion.
iii) The work and heat transfer for each of the four processes.
The following data refer to a four cylinder internal combustion engine operating on a four stroke cycle at 4400 rev/min: volume compression ratio 7.6:1; cylinder diameter 78mm; stroke 105mm; brake power 38 kW; indicated power 47.5 kW; air consumption 21 kg/kg fuel; fuel consumption 13.6 kg/hour; energy release of 1 kg of fuel, 41800 kJ. Determine,
(i) the mechanical efficiency
(ii) the mean effective pressure
(iii) the volumetric efficiency (referred to 1 atm = 1.01325 bar, 0°C)
(iv) the brake thermal efficiency
(v) the brake thermal efficiency ratio relative to the air-standard cycle.
Assume R = 0.287 kJ/kg K.
In a single-acting two-stage reciprocating air compressor 4.5 kg of air per min are compressed from 1.013 bar and 15°C through a pressure ratio of 9 to 1. Both stages have the same pressure ratio, and the law of compression and expansion in both stages ispv1.3=c . If intercooling is complete, calculate the indicated power and the cylinder swept volume required. Assume that the clearance volumes of both stages are 5% of their respective swept volumes and that the compressor runs at 300 rev/min.
A single stage reciprocating compressor takes 1 m3 of air per minute at 1.013 bar and 15°C and delivers it at 7 bar. Assuming that the law of compression ispv1.35=c , and that clearance volume is negligible, calculate the indicated power.
how to draw water and oil projection which there are 2 containers and have hole at the same level?
a venturimeter is used to measure liquid flow rate of 7.5x103L/min. the difference in pressure across the venturimeter is 8m of the flowing fluid. the pipe diameter is 0.19m. determine the throat diameter of the venturimeter. given Cd value is 0.96
how much heat would be required to transform 2 kg of saturated liquid-vapor mixture of water at 60% quality and 80 degree celcius to saturated vapour at constant pressure and then to steam at 150 degree celcius and 0.2 MPa at constant volume?
Steam enters with negligible velocity a well-insulated turbine operating at
steady state at 4 MPa, 320°C. The steam expands to an exit pressure of 0.07
MPa, a quality (dryness fraction) of 0.95 and a velocity of 90 m/s. The diameter
of the exit is 0.6 m. Neglecting potential energy effects, find the power
developed by the turbine in kW
