SpecialProblems17-19ME200SP2012 - 2 and a velocity of 20...

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Special Problems for ME 200 – Spring 2012 Special Problems SP17, SP18, and SP19 Due Friday, February 24, 2012 SP17: Refrigerant R-22 enters a constant diameter pipe at a pressure of 10 bar, a temperature of 20°C, and a velocity of 2.20 m/s. Heat is added to the R-22 and at the pipe exit, the pressure is 9 bar and the temperature is 35.6°C. The pipe has a circular cross-section with a diameter of 0.105 m. (a) Calculate the mass flow rate (kg/s) through the pipe. (b) Calculate the velocity (m/s) at the pipe exit. (c) Calculate the rate of heat transfer (kJ/s) to the R-22. SP18: Air with a mass flow rate of 10 lbm/s enters a poorly insulated nozzle operating at steady state with a temperature of 400°F, a pressure of 75 lbf/in
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Unformatted text preview: 2 , and a velocity of 20 ft/s. At the nozzle exit the temperature is 200°F, the pressure is 5 lbf/in 2 , and the fluid velocity is 1100 ft/s. (a) Determine the nozzle area (ft 2 ) at the inlet and exit. (b) Determine the rate of heat transfer (Btu/s) between the nozzle and the surroundings. SP19: Refrigerant 134a enters a well-insulated compressor as a saturated vapor at -26°C with a volumetric flow rate of 0.5 m 3 /s. The R134a exits the compressor at a pressure of 9.0 bar and a temperature of 75°C. (a) Determine the mass flow rate (kg/s) through the compressor. (b) Determine the volumetric flow rate (m 3 /s) at the compressor exit. (c) Calculate the compressor power (kW)....
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