SpecialProblems30-32

SpecialProblems30-32 - steady rate of 100 kg/min at 20 C...

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Special Problems for ME 200 – Fall 2009 Special Problems 30, 31, and 32 Due Friday, November 13, 2009 SP30: R134a at 2.8 bar and 60 C is compressed in a piston-cylinder device to 14 bar via an isothermal, internally reversible process. The surrounding temperature is 25 C. (a) Determine the heat transfer and work (kJ/kg) during the process. (b) Calculate the entropy generation (kJ/kg-K) considering the refrigerant inside the piston-cylinder device with its immediate surrounding. (c) Show the compression process on P-v and T-s diagrams. (d) Indicate the work and heat transfer on P-v and T-s diagrams, respectively. SP31: Liquid water is heated in an insulated chamber by mixing it with steam. Water enters at a
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Unformatted text preview: steady rate of 100 kg/min at 20 C and 3 bar. Steam enters at 320 C and 3 bar. The mixture leaves the chamber at 90 C and 3 bar. What is the rate of entropy generation (kW/K) for the chamber? SP32: Air at 100 kPa and 17 C flows steadily through a compressor at the rate of 5 kg/min. The pressure after compression is 700 kPa. Consider variable specific heats for air. (a) Determine the minimum power input (kW) for the compression process if compression occurs adibatically. (b) What is the minimum power input (kW) for the compression process if compression occurs isothermally?...
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