SpecialProblems16-18 - nozzle at 297 C and 2 bar. The flow...

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Special Problems for ME 200 – Fall 2011 Special Problems 16, 17, and 18 Due Friday, October 7, 2011 SP16: Steam at 800 psia and 1000 F is injected into a rigid tank at the rate of 630 lbm/min at one inlet and liquid water at 800 psia and 70 F flows into the tank at another inlet at the rate of 12 gal/min. The two streams mix completely in the tank and a single mixed stream leaves the tank at 800 psia. The tank loses heat at the rate of 12,000 Btu/min. (a) What is the mass flow rate (lbm/min) of the exit stream? (b) Calculate the temperature ( F) of the exit stream. SP17: Air enters the nozzle of an aircraft engine at 407 C and 8 bar with a velocity of 10 m/s. Heat loss of 25 kW occurs while air flows steadily through the nozzle. Air exits the
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Unformatted text preview: nozzle at 297 C and 2 bar. The flow area at the nozzle inlet is 800 cm 2 . Calculate the area (cm 2 ) at the nozzle exit. SP18: R-134a enters a water-cooled compressor as saturated vapor at 1 bar with a mass flow rate of 0.9 kg/min. The inlet area is 5 cm 2 . The cooling water removes heat at the rate of 140 kJ/min and the compressor requires 3 kW power input. The refrigerant leaves the compressor at a pressure of 8 bar. (a) Calculate the velocity (m/s) of the refrigerant at the compressor inlet. (b) Determine the temperature ( C) of the refrigerant at the compressor exit. (c) Show the compression process on P-v diagram. Label the states, show property values, and indicate appropriate lines of constant temperature....
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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