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SpecialProblems25-26

SpecialProblems25-26 - SP26 A solid object of AISI 302...

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Special Problems for ME 200 – Spring 2010 Special Problems 25 & 26 Due Friday, March 26, 2010 SP25: Water (m = 2 kg) is contained in a vertical piston-cylinder assembly with a fixed weight resting on the piston. The water is initially saturated liquid at a pressure of 3 bar (state 1). Heat is added until the quality of the mixture increases to 80% (state 2). (a) Show the process on a T-s diagram. (b) Calculate the change in entropy (kJ/K) of water using property table values. (c) Calculate the change in entropy (kJ/K) of water assuming an internally reversible process from state 1 to state 2.
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Unformatted text preview: SP26: A solid object of AISI 302 steel at a temperature of 850 C is quenched in mineral oil at a temperature of 25 C. The mass of the solid steel object is 8 kg. The specific heat and density of the oil are 1,950 kJ/kg-K and 890 kg/m 3 , respectively. The oil is contained in a well-insulated cylindrical tank that has a diameter of 1 m and a height of 1 m. (a) What is the change in the entropy (kJ/K) of the steel? (b) Determine the change in entropy (kJ/K) of the oil. (c) What is the total entropy change (kJ/K) for the system comprising of steel and oil?...
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