課程名稱︰熱力學 Thermodynamics
課程性質︰必修
課程教師︰馬小康教授
開課系所︰機械系
考試時間︰1/13 2005
試題 :
（15％）（1）In the Vapor-Compression Refrigerator Cycle, please
（a） Plot T-S diagram.
（b） Write down the coefficient of performance of a refrigerator
（c） What are the entropy change processes of the system in this Cycle？
（10％）（2）Write down （a）the Clapeyron equation, （b）explain the meaning of the Clapeyron equation
（10％）（3）Derive expressions for the slopes of constant pressure and constant volume line on a T-S plane for a perfect gas with constant specific heats and show that the volume line is steeper.
（20％）（4）Please explain the following terms：
a. The Maxwell relations of dh=Tds+vdP
b. Isentropic efficiency of turbine
c. Joule-Thomson coefficient
d. The utilization factor for a cogeneration plant
e. Exergy transfer by heat transfer, Q
（25％）（5） An ideal Diesel cycle with air as the working fluid has a compression
ratio of 18 and a cutoff ratio of 2. At the beginning of the
compression process, the working fluid is at 101.325kPa, 25℃, and 1800m3.
Utilizing the cold-air –standard assumptions, determine（a）the plot of the
P-V and T-S diagrams,（b）the temperature and pressure of the air at the end
of each process,（c）the net work output and the thermal efficiency.
（The gas constant of air is R=0.287kJ/kg K, Cp=1.005 kJ/kg K, Cv=0.718 kJ/kg K, and k=1.4）
（20％）A 200-m3 rigid tank initially contains atmospheric air at 100kPa and 300K
and is to be used as a storage vessel for compressed air at 1MPa and
300K. Compressed air is to be supplied by a compressor that takes in
atmospheric air at Po=100kPa and To=300K. Determine the minimum
work requirement for this process.
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