东北大学2001级《工程热力》期末试题(2003年6月27日星期五)东北大学2001级《工程热力学》期末试题(2003年6月27日星期五).docVIP

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东北大学2001级《工程热力》期末试题(2003年6月27日星期五)东北大学2001级《工程热力学》期末试题(2003年6月27日星期五).doc

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东北大学2001级《工程热力》期末试题(2003年6月27日星期五)东北大学2001级《工程热力学》期末试题(2003年6月27日星期五)

东北大学2001级《工程热力学》期末试题（2003年6月27日星期五） Questions of Semester Examination about Engineering Thermodynamics 答题在答题纸上进行，写清题号，不必抄题。答题语言随意。 Write out the Following Concepts and Laws: (1) open system; (5%) (2) Carnot cycle; (5%) (3) The Kelvin-Planck statement of the second law of thermodynamics; (5%) (4) The Laval nozzle; (5%) (5) Ideal gas; (5%) (6) The thermal efficiency of a heat engine. (5%) Example 1-10 The piston of a vertical piston-cylinder device containing a gas has a mass of 60kg and a cross-sectional area of 0.04 m2, as shown in Fig. 1-66. The local atmosphere pressure is 0.97bar (0.097MPa), and the gravitational acceleration is 9.81 m/s2. (a) Determine the pressure inside the cylinder. (b) If some heat is transferred to the gas and its volume is doubled, do you expect the pressure inside the cylinder to change? (10%) Example 2-10 Mass of Air in a Room Determine the mass of the air in a room whose dimensions are 4m(5m(6m at 100kPa and 25℃. (10%) Example 4-9 Deceleration of Air in a Diffuser Air at 10℃ and 80 kPa enters the diffuser of a jet engine steadily with a velocity of 200m/s. The inlet area of the diffuser is 0.4m2. The air leaves the diffuser with a velocity that is very small compared with the inlet velocity. Determine (a) the mass flow rate of the air and (b) the temperature of the air leaving the diffuser. (15%) Example 5-5 Heating a House by a Heat Pump A heat pump is used to meet the heating requirements of a house and maintain it at 20℃. On a day when the outdoor air temperature drops to -2℃, the house is estimated to lose heat at a rate of 80,000kJ/h. If the heat pump under these conditions has a COP(Coefficient of Performance) of 2.5, determine (a) the power consumed by the heat pump, and (b) the rate at which heat is absorbed from the cold outdoor air, and (c) If we were to use an electric resistance heater instead, how many times we would have to supply the entire 80,000kJ/h to the resistance as electric energy? (15%) Example 9-4