# HW_100 - area in cm 2 Problem 04 Refrigerant 134a enters a...

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Homework Assignment 10 Problem 01 Water flows through a closed tank. with D 1 = 60 cm, (AV) 1 = 100 m 3 /hr, D 2 = 5 cm and average velocity V 2 = 8 m/s. If D 3 = 4 cm, compute (AV) 3 and V 3 . Problem 02 Water at 20°C flows steadily at 40 kg/s through the nozzle shown. If D 1 = 18 cm and D 2 = 5 cm, compute the average velocity in (m/s) at sections 1 and 2. Problem 03 Air enters a one inlet, one exit control volume at 8 bar, 600 K and 40 m/s through a flow area of 20 cm 2 . At the exit, the pressure is 2 bar, the temperature is 400 K and the velocity is 350 m/s. The air behaves as an ideal gas. For steady state operation, determine (a) the mass flow rate in kg/s and (b) the exit flow
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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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