Binder2 - Assignment 2 D7 A fi'ictionless piston-cylinder...

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Unformatted text preview: Assignment 2 D7. A fi'ictionless piston-cylinder device initially contains 200 L of saturated liquid refrigerant-134a. The piston is he to move, and its mass is such that it maintains a pressure of 800 kPa on the refrigerant. The refiigerant is now heated until its temperature rises to 50°C. Calculate the work done during this process. Answer: 5227kJ ' i ll s” 301:.) D8. A piston-cylinder device contains 50 kg of water at 150 kPa and 25 '.C The cross-sectional area of the piston is 0.1 n12. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3, the piston reaches a linear spring whose spring constant is 100 kN/m. More heat 1s transferred to the water until the piston rises 20 cm more. Determine (a) the final pressure and temperature and (b) the work done during this process. Also show the process on a P-V diagram. Answers: (a) 350 kPa, 138.88C; (b) 27.5 H D9. Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel. During the process, 30 U of heat is transferred to the water, and 5 k] of heat is lost to the surrounding air. The paddle-wheel work amounts to 500 Nm. Determine the final energy of the system if its initial energy is 10 kJ. Answer: 35.5 kJ D10. An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45 min through a resistor placed in the water. Ifone-half of the liquid is evaporated during this constant-pressure process and the paddle-wheel work amounts to 300 1:], determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. Answer: 230.9 V ”—— MBJ MW) ""0 DIE lib-’0 on D11. Determine the enthalpy change Ah of oxygen, in Btu/lbm, as it is heated from 800 to 1500 R, using (a) the empirical data for h from the oxygen table (Table A-23E), (b) the empirical specific heat equation as a fimction of temperature (Table A-2Ec), (c) the C19 value at the average temperature (Table A- 2Eb), and (d) the Cp value at room temperature (Table A—2Ea). Answers: (a) 169.2 Btu/lbm, (b) 170.1 Btu/lbm, (c) 178.5 Btu/lbm, (d) 153.3 Btu/lbm D12. A frictionless piston-cylinder device initially contains air at 200 kPa and 0.2 m3. At this state, a linear spring (F proportional to x) is touching the piston but exerts no force on it. The air is now heated to a final state of 0.5 m3 and 800 kPa. Determine (a) the total work done by the air and (b) the work done against the spring. Also, show the process on a P-v diagram. Answers: (a) 150 k], (b) 90 kJ A College of Engineering ———-_—. 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