SpecialProblems27-29

SpecialProblems27-29 - Special Problems for ME 200 Fall...

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Special Problems for ME 200 – Fall 2009 Special Problems 27, 28, and 29 Due Friday, November 6, 2009 SP27: One kilogram of ice at 0 C is added to 7 kg of water at 30 C and 1 bar. The enthalpy of melting for ice is 335 kJ/kg. Consider that the process is adiabatic. (a) What is the final equilibrium temperature ( C)? (b) Calculate the entropy production (kJ/K) during this process. SP28: An insulated rigid tank initially contains 2.7 kg of carbon dioxide gas at 100 kPa and 27 C. A rotating paddle wheel adds 200 kJ of work into the system. Assume that specific heats for carbon dioxide are constant at their 27 C values. (a) What is the final temperature ( C) of carbon dioxide? (b) Calculate the entropy change (kJ/K) for carbon dioxide during this process. Now consider that specific heats for carbon dioxide are not constant. (c) What is the final temperature ( C) of carbon dioxide? (d) Determine the entropy change (kJ/K) for carbon dioxide during this process.
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