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A cheap radial-vaned centrifugal fan is required to provide a supply of pressurized air to a furnace. The specification requires that the fan produce a total pressure rise equivalent to 7.5 cm of water at a volume flow rate of 0.2 m3 /s. The fan impeller is fabricated from 30 thin sheet metal vanes, the ratio of the passage width to circumferential pitch at the impeller exit being specified as 0.5, and the ratio of the radial velocity to blade tip speed as 0.1. Assuming that the overall isentropic efficiency of the fan is 0.75 and that the slip can be estimated from Stanitz's expression, Eq. (7.34b), determine
a. the vane tip speed;
b. the rotational speed and diameter of the impeller;
c. the power required to drive the fan if the mechanical efficiency is 0.95;
d. the specific speed. For air assume the pressure is 105 Pa and the temperature is 20°C
a a rigid tank containing 20 kg of refrigerant 134a as saturated vapor at 1.0 bars and -26.43 c is heated until the
a transformer consisting of two coils wrapped around an iron core is connected to a generator and a resistor as shown
Saturated steam at 230 degrees F, 20.78 psia and 19.386 ft cubed per pound of mass enters a compressor with an internal energy of 108.26 Btu/lb of mass and is compressed to 80 psia. the mass flow rate is 50 lb mass per hour. Heat loss from the compre..
a solar-thermal power plant uses ideal rankine with r-134a. mass flowrate is 5000 kgs. the sat. vapor enters the
Effective Matching of Surface Roughness, Concerning the effective matching of surface roughness using a lathe, I have been asked to quantify Ra = C1* s^C2 v^C3 Re^C4
During operation the surface temperatures are known to be T1 = 25°C, T2 = 60°C, and T3 = 70°C. What is the net rate at which radiation is transferred to the cover due to exchange with the absorber plates?
Steam at 140 lbf/in.2, 1000°F enters an insulated turbine operating at steady state with a mass flow rate of 3.24 lb/s and exits at 2 lbf/in.2 Kinetic and potential energy effects are negligible. Determine the maximum theoretical power that can b..
Use K-maps to determine an optimal equation for each output. Convert each equation to use, at most, one gate. Draw a circuit that implements each equation from part c.
an insualed piston-cylinder device contains 5 kg of satured mix of water initially at 100kpa and 6m3. now 3917kj of
Atmospheric pressure at sea level is 14.7 psi. At what depth does the pressure of sea water plus the pressure of the air at the surface equal three atmospheres of pressure?
1. Briefly tell what is meant by the drift velocity and mobility of a free electron.2. (a) Calculate the drift velocity of electrons in silicon at room temperature and when the magnitude of the electric field is 500 V/m.
air undergoes a polytropic process in a piston-cylinder assemply from p1 14.7 lbfin2 t1 70 degrees f to p2
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