EX1F07 - ME 235 EXAM I C BORGNAKKE V SICK ME Dept 1[15 a...

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ME 235 EXAM I , OCT 11, 2007 C. BORGNAKKE, V. SICK ME Dept. 1. [15%] a. R-22 1600 kPa, 50 ° C u = ?, Z =? b. R-22 20 ° C, u = 200 kJ/kg P = ?, v = ? c. NH 3 10 ° C, v = 0.4 m 3 /kg P = ? u = ? 2. [30%] A 1 kg rigid steel tank contains 1.2 kg R-134a at 20 ° C and 500 kPa. Now the set-up is placed in a freezer and brought to 20 ° C. a) How much heat transfer took place 3. [30%] A cylinder/piston arrangement contains 10 g ammonia at 20 ° C with a volume of 1 L. There are some stops so if the piston is at the stops the volume is 1.4 L. The ammonia is now heated to 200 ° C. a) Find the initial pressure. b) Determine the final state (give 2 properties). c) Draw a P-v diagram of this process and find the work. d) Find the amount of heat added in 4. [25%] Air goes through a polytropic process with n = 1.3 in a piston/cylinder set-up. It starts at 200 kPa, 300 K and ends with a pressure of 2200 kPa. a) Find the final T b) Show the P-v diagram and find v 2 /v 1 c) Find the process specific work d) Find the specific heat transfer NH P o m p 3
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ME 235 EXAM I, OCT 11, 2007 Solutions: 1.
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