# EX1F08 - ME 336 EXAM 1 C BORGNAKKE ME Problem 1[30 Points A...

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ME 336 EXAM 1, OCT 14, 2008 C. BORGNAKKE, ME Problem 1 [30 Points] A balloon is filled with air from a line at 200 kPa, 300 K to a final state of 110 kPa, 300 K with a mass of 0.1 kg air. Assume the pressure is proportional to the balloon volume as: P = 100 kPa + CV. Find the heat transfer to/from the ambient at 300 K and the total entropy generation. Problem 2 [40 Points] A rigid tank with 0.5 kg ammonia at 1600 kPa, 160 o C is cooled in a reversible process by giving heat to a reversible heat engine that has its cold side at ambient 20 o C, shown in Figure. The ammonia eventually reaches 20 o C and the process stops. Find the heat transfer from the ammonia to the heat engine and the work output of the heat engine. W Q H Q L HE C.V. total NH 3 Ambient Problem 3 [30 Points] A rock bed consists of 6000 kg granite and is at 70 ° C. A small house with lumped mass of 12000 kg wood and 1000 kg iron is at 15 ° C. They are now brought to a uniform final

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EX1F08 - ME 336 EXAM 1 C BORGNAKKE ME Problem 1[30 Points A...

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