Otto Cycle In Thermodynamics Question And Answers Homework Help
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1.An ideal Otto cycle has a compression ratio of 10.5, takes in air at 90 kPa and 40 deg C, and is repeated 2500 time per minute. Using variable specific heats, at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kW of power. The maximum temperature is 2250 K.
2.An ideal otto cycle with air as the working fluid has a compression ratio of 8 . The min and max temp in the cycle are 300 and 1340 k. Determine
a) amount of heat transferred to air during heat addition process
b) thermal efficiency
c) thermal efficiency of Carnot cycle operating between the same temperatures.
3.In an air standard otto cycle the compression ratio is 8 and the heat input is 2300 kJ/kg. at the beginning of the compression stroke the conditions of the air are 100kpa and 15C. Calculate:
a) the max temperature of the cycle
b)the net work output
c) the thermal efficiency
take y=1.4 and Cv= 0.72kj/kgK
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21. In a spark ignition engine with compression ratio of 10, the lowest temperature is 200C and the lowest pressure is 200kpa. The work output is 1000kJ/kg.
a. What is the maximum temperature?
b. What is the (air-standard) thermal efficiency?
c. What is the Carnot efficiency?
d. What is the Mean Effective Pressure?
22. An ideal Otto cycle with air as the working fluid has a compression ratio of 7. The minimum and maximum temperatures in the cycle are 25°C and 1000°C respectively. Determine
(a) the amount of heat transferred per unit mass of air during the heat addition process
(b) the thermal efficiency
(c) the mean effective pressure.
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