SpecialProblems8-10

SpecialProblems8-10 - in the cycle. (d) What is the heat...

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Special Problems for ME 200 – Fall 2009 Special Problems 8, 9, & 10 Due Friday, September 18, 2009 SP8: 0.5 kg of air, contained inside a piston-cylinder device, with an initial pressure of 5 bar and initial volume of 0.1 m 3 undergoes a thermodynamic cycle consisting three processes as follows: Process 1-2: 100 kJ of heat is added to the device in an isobaric manner during which the internal energy increases by 20 kJ Process 2-3: Air cools at constant volume and the internal energy decreases by 50 kJ Process 3-1: Compression of air via a polytropic process (PV 1.3 = constant). (a) Draw the cycle on a P-V diagram. (b) What is the pressure (bar) and volume (m 3 ) at states 2 and 3? (c) Find the heat transfer (kJ), work (kJ), and internal energy change (kJ) for each process
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Unformatted text preview: in the cycle. (d) What is the heat transfer (kJ) and work (kJ) for this cycle? SP9: A heat pump has coefficient of performance of 3. The rate of heat transfer from the heat pump cycle is 300 kW. The heat pump cycle is operated by a power cycle. The rate of heat transfer into the power cycle is 250 kW. (a) What is the thermal efficiency (%) of the power cycle? (b) Determine the amount of heat (kW) received by the heat pump cycle. SP10: A 0.5 m 3 rigid vessel initially contains a saturated liquid-vapor mixture of water at 100 C. The water is heated until it reaches its critical point. (a) Indicate the process on a P-v diagram, (b) What is the mass of liquid water (kg) at the initial state? (c) Determine the volume occupied by vapor (m 3 ) at the initial state....
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