EX2w06 - ME 336 EXAM 2, MARCH 24, 2006 C. BORGNAKKE, ME...

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ME 336 EXAM 2, MARCH 24, 2006 C. BORGNAKKE, ME Dept. Problem 1 [40 Points] A low T application runs a powerplant with R-22 having a high pressure of 2000 kPa. The boiler exit is at 100 C and the condenser operates at -40.8 C. There is one open “feedwater” heater operating at 500 kPa with an exit as saturated liquid at 0 C. a) Find the extraction fraction of flow in the turbine to go to the FWH. b) Find the turbine work per mass flow in the boiler. Problem 2 [30 Points] An air flow of 5 kg/min at 1500 K, 125 kPa, goes through a constant pressure heat exchanger, giving energy to a heat engine. The air exits at 500 K and the ambient is at 298 K, 100 kPa. Find the rate of heat transfer delivered to the engine and the power the engine can produce. H Q W L Q Ambient HE 1 2 Problem 3 [30 Points] A Brayton cycle has inlet at 290 K, 90 kPa and the combustion adds 1000 kJ/kg. a) How high can the compression ratio be so the highest temperature is below 1700 K? b) For that compression ratio can a regenerator be used and how much energy
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EX2w06 - ME 336 EXAM 2, MARCH 24, 2006 C. BORGNAKKE, ME...

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