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1- Consider an ideal air-standard Stirling cycle with an ideal regenerator. The
minimum pressure and tmeperature in the cycle are 100 kPa, 25°C, the
compression ratio is 11, and the maximum temperature in the cycle is 1000
°C. Analyze each of the four processes in this cycle for work and heat
transfer, and determine the overall perfomance of the engine.
2- Show the T-s diagram for the air-standard Carnot cycle. In an air standard
Carnot cycle the low temperature is 280 °K and the efficiency is 60%. If the
pressure before compression and after heat rejection is 100 kp , find the high
temperature and the pressure just before heat addition.
3- The compression ratio of a dual combustion cycle is 14 and the maximum
temperature in the cycle is 850 °C. If the working substance receives equal
amounts of heat during bus the constant volume and constant pressure
processes, determine the air standard efficiency of the cycle. Assume
temperature at the start of the cycle is 27°C , Cp=1.005 kJ/kg°k and
Cv=0.718 kJ/kg °k.
4- In Brayton cycle , prove that the optimum pressure ratio rp for maximum
net-work done between the temperature T1 and T3 where T3 is the maximum
temperature obtained and T1 is the temperature , is given by rp=
)
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.
5- An air-standard Ericsson cycle has an ideal regenerator. Heat is supplied at
1000°C and heat is rejected at 20°C. Pressure at the beginning of the
isothermal compression process is 70 kPa. The heat added is 600 kJ/kg. Find
the compressor work, the turbine work, and the cycle efficiency.