Unformatted text preview: area in cm 2 . Problem 04 Refrigerant 134a enters a condenser of a refrigeration system operating at steady state at 9 bar, 50 °C, through a 2.5 cm diameter pipe. At the exit, the pressure is 9 bar, the temperature is 30 °C and the velocity is 2.5 m/s. The mass flow rate of the entering refrigerant is 6 kg/min. Determine (a) the velocity at the inlet in (m/s) and (b) the diameter of the exit pipe in (cm). Problem 05 Why might a computer cooled by a constant speed fan operate satisfactorily at sea level but overheat at high altitude? Due Friday June 25, 2010. 10:00 am....
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 Summer '07
 RAMUSSEN
 Thermodynamics, Mass flow rate

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