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Air enters the evaporator at 14.7 psia and 90 F with a volumetric flow rate of 200 ft3/min. Refrigerant 134a at 20 psia with a quality of 30 % enters the evaporator at a rate of 4 lbm/min and leaves as saturated vapor at the same pressure. Assume steady state operation and negligible pressure changes through the evaporator. Also, assume the air behaves as an ideal gas with constant speci¯c heats. Determine:
a. the rate of heat transfer from the air [Btu/min]
b. the exit temperature of the air [F]
an orthotropic material has the follow properties ex 7500 ksi ey 2500 ksi gxy 1250ksi and vxy .25. determine the
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The inner and outer surfaces of a 5 mm window glass are maintained at 10°C and 3°C. What is the amount of heat transfer through the glass in 5 hrs?
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water at 4oc is to be delivered to the top of a ski area for snowmaking purposes. the water is to be drawn from a
Design a gear train which satisfies the above criteria. Use a sketch to illustrate your design, label the gears A, B, C, etc. from the driver to the driven gear, and state the number of teeth on each gear
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