[試題] 101下 許文翰 熱力學 期末考
課程名稱︰熱力學
課程性質︰系必修
課程教師︰許文翰
開課學院：工學院
開課系所︰工科系
考試日期（年月日）︰2013/06/17
考試時限（分鐘）：140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. In an air-standard Brayton cycle the compressor inlet conditions are 100kPa
and 280K. The turbine inlet conditions are 1000 KPa and 1167K. The turbine
produces 11190 KW. Determine (a) the air flow rate; (b) the compressor
power; (c) the cycle efficiency; (d) the pressure ratio for maximum work;
(e) the second-law efficiency. Note:Cp/Cv = 1.4 (20分)
2. A brayton cycle uses argon as the working substance. At the beginning of
compression, the temperature is 335K and the pressure is 480 KPa. The
compression process is adiabatic with discharge conditions of 645K and
1930 KPa and expands adiabatically to 890K and 480 KPa.
Determine (a) the compressor efficiency; (b) the turbine efficiency;
(c) the thermal efficiency (20分)
3. An air-standard diesel cycle receives 28.5 KJ/cycle of heat while operating
at 300 rev/min. At the beginning of compression, P1 = 100 KPa, T1 = 305K,
V1 = 0.0425 m^3. At the beginning of heat addition, the pressure is
3450 KPa. Determine (a) the work; (b) the power; (c) the mean effective
pressure. Note: Cp/Cv = 1.4 (20分)
4. An air-standard Otto cycle involves a compression ratio of 9 to 1. The
pressure and temperature at the end of the compression stroke are 800 KPa
and 700 度C, respectively. Determine the cycle work per kilogram if the
pressure at the end of heat addition is 3 MPa. (20分)
5. A two-stage air compressor receives 0.238 m^3/s of air at 100 KPa and 27度C
and discharges it at 1000 KPa. The value of n for compression is 1.35.
Determine (a) the minimum power necessary for compression; (b) the power for
one-stage compression to the same pressure; (c) the maximum temperature for
(a) and (b) ; (d) the heat removed in the intercooler. (20分)
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