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Unformatted text preview: ME 235 EXAM 2, NOVEMBER 22, 2005 C. BORGNAKKE, ME Problem 1 (50 Points) Air at 300 K, 100 kPa in a rigid box is heated to 1000 K by a 1500 K source. a) Find the final pressure. b) Find the specific heat transfer. c) Find the total entropy generation per kg air. Air at 300 K, 100 kPa is compressed in a reversible adiabatic process by a piston cylinder so T2 = 1000 K. d) Find the final pressure e) Find the specific work. Problem 2 (20 Points) . A large heat pump upgrades 5 MW of heat (QL) at 85oC to be delivered at 185oC. Suppose the actual heat pump has a COP of HP = 2.5. . a) How much power W is required to do this? b) What is the rate of entropy generation inside the heat pump? Problem 3 (30 Points) A 0.005 m3 tank is empty and filled with steam from a supply line at 500 kPa, 200oC. The operator filled it slowly so the final state was measured to be 200oC, 500 kPa. a) Find the final mass in the tank. b) How much heat transfer took place? c) If it was filled quickly so no heat transfer, how hot would it be?...
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This note was uploaded on 05/05/2008 for the course ME 235 taught by Professor Borgnakke during the Winter '07 term at University of Michigan.
- Winter '07
- Heat Transfer