課程名稱︰熱力學 課程性質︰必修 課程教師︰許文翰 開課學院：工學院 開課系所︰工程科學及海洋工程學系 考試日期（年月日）︰2009/06/18 考試時限（分鐘）：90分鐘 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : 1.The compression ratio in an air-standard Otto cycle is 10. At the beginning of the compression stroke,the pressure is 0.1 MPa and the temperature is 288K.The heat transfer to the air per cycle is 1800 kJ/kg air.Determine (1)The pressure and temperature at the end of each process of the cycle; (2)The thermal efficiency;(3)the mean effective pressure 2.An air-standard diesel cycle has a compression ratio of 20,and the heat transferred to the working fluid per cycle is 1800 kJ/kg.At the beginning of the compression process the pressure is 0.1 MPa and the temperature is 288K. Determine (1)The pressure and temperature at each point in the cycle;(2)The thermal efficiency;(3)The mean effective pressure. 3.In an air-standard Brayton cycle,the air enters the compressor at 0.1 MPa and 288K.The pressure leaving the compressor is 1 MPa and the maximum temperature in the cycle is 1373K.Determine (1)The pressure and temperature at each point in the cycle;(2)The compressor work,turbine work;(3)cycle efficiency. 4.Calculate the change of entropy of 3kg of air that changes state from 300K and 100 KPa to 800K and 500 KPa. 5.A compressor receives 0.75 m^3/s of air at 290K and 101KPa.The compressor discharges the air at 707KPa and 435K.The heat transfer from the control volume is determined to be 2.1KW.Determine the power required to drive the compressor. --

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