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SpecialProblems11-12

# SpecialProblems11-12 - (c Find the specific heat...

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Special Problems for ME 200 – Fall 2011 Special Problems 11 and 12 Due Friday, September 23, 2011 SP11: A piston-cylinder device containing water undergoes a thermodynamic cycle consisting of the following three processes: Process 1-2: Isobaric (constant pressure) expansion from 90 C and 0.97 m 3 /kg to 360 C Process 2-3: Compression during which Pv = constant Process 3-1: Isochoric (constant volume) heat rejection (a) Sketch the cycle on P-v and T-v diagram. Label the states, show property values, and indicate appropriate lines of constant temperature or pressure. (b) Calculate the specific work (kJ/kg) for the entire cycle.
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Unformatted text preview: (c) Find the specific heat transfer (kJ/kg) for the constant volume process. (d) Is this a power cycle or a refrigeration cycle? SP12: A well-insulated rigid vessel containing 10 L of R-134a at 12 bar and 0 C is used for cooling some electronic parts. Each electronic part has a mass of 0.1 kg and has an average specific heat of 0.14 kJ/kg-K. The electronic parts are initially at 300 C and are required to be cooled to 80 C without causing the temperature of R-134a to exceed 40 C. Neglect any evaporation of R-134a. Determine the number of electronic parts that can be cooled....
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