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A centrifugal pump is being designed to pump liquid refrigerant R-134a atroom temperature and atmospheric pressure. The impeller inlet and outletradii are r1= 100 and r2= 180 mm, respectively (Fig. 14-42). Theimpeller inlet and outlet widths are b1= 50 and b2= 30 mm (into the pageof Fig. 14-42). The pump is to deliver 0.25 m3/s of the liquid at a net headof 14.5 m when the impeller rotates at 1720 rpm. Design the blade shapefor the case in which these operating conditions are the design conditions ofthe pump (V1,t= 0, as sketched in the figure); specifically, calculate anglesb1and b2, and discuss the shape of the blade. Also predict the horsepowerrequired by the pump. width=
FIGURE 14-42Relative and absolute velocity vectorsand geometry for the centrifugal pumpimpeller design of Example 14-6.
consider two geothermal wells whose energy contents are estimated to be the same. will the exergies of these wells
the ocean thermal energy conversion otec power plant takes advantage of the temperature difference between ocean
heat is transferred steadily to boiling water in a pan through its flat bottom at a rate of 650 w. if the temperature
assume that the heat treatment supervisor in charge of processing the some gears is on an economy program directed
a 4-bit ad converter is applied to convert a bipolar signal -5v to 5v. what is the conversion resolution? code width?
Humid air is to be conditioned in a constant pressure process at 1 atm from 39C dry bulb and 50 percent relative humidity to 17C dry bulb and 10.8C wet bulb. The air is first passed over cooling coils to remove all the moisture necessary to achieve t..
Determine the coordinates and of the centroid C of the area shown in the figure.
a cube of aluminum 10 cm on each side is initially at a temperature of 300degc and is immersed in a fluid at 100degc.
water vapor in a piston-cylinder assembly undergoes a process from saturated vapor at 150 c to a pressure of 300 kpa.
The heat transfer coefficient in the oven is 25W/m^2K. Calculate rate of heat transfer per m^2 area.
Examine the posterior distribution of a/b, and compare it to the corresponding prior distribution as well as to the average of yi/xi across the six counties.
r-410a at 120c 4 mpa is in an insulated tank and flow is now allowed out to a turbine with a backup pressure of 800
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