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Unformatted text preview: The power input to the compressor is 55.2 kJ per kg of refrigerant flowing. Neglecting kinetic and potential energy effects, determine the heat transfer rate in kW. 2. (35 %) Steam enters a nozzle operating at steady state at 30 bar, 320C, with a velocity of 100 m/s. The exit pressure and temperature are 10 bar and 200 ° C respectively. The mass flow rate is 2 kg/s. Neglecting heat transfer and potential energy, determine a) the exit velocity in m/s. b) the inlet and exit flow areas, in cm 2 . 3. (35%) Air undergoes a compression in a piston-cylinder assembly from p 1 = 1 atm, T 1 = 70 ° F to p 2 = 5 atm. Using the ideal gas model, find the work and heat transfer per unit mass, BTU/lb, for a) an isothermal process b) a polytropic process with n = 1.3. c) show both processes on a single p-v diagram...
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This note was uploaded on 04/08/2008 for the course MAE 221 taught by Professor Danielm.nosenchuck during the Fall '05 term at Princeton.
- Fall '05