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A Pumped-storage facility uses two identical pump-turbines. When operating as pumps, these units have an efficiency of 0.82, and when operating as turbines, their efficiency is 0.86. The motor-generators installed with these pump-turbines have an efficiency of 0.85 when operating as motors and 0.91 when operating as generators. Each pump-turbine uses its own 100-m-long, 150-cm steel penstock. The gross head at the site is 45m, and draft-tube losses may be assumed to be negligible. When operating as pumps, the pump-turbines can each delivery 27 m^3/s into the reservoir, which has a useful capacity of 1.75 * 10^6 m^3. When operating as turbines, the pump-turbines each deliver 9400 kW to their generator shafts. If power is purchased at 25 mils/k Wh for pumping, at what rate must generated power be sold in order to obtain a positive net annual revenue of at least $310,000?
a round steel rod, 25 mm in diameter, subjected to a bending moment of 160 Nxm. calculate the maximum bending stress.
a storage tank has a diameter of 80 ft, a height of 25ft and contains oil to a height of 15ft. the suction pumps, which can handle 15000bbl/d, are started, but the safety valves are clogged and a vacuum is drawn in the tank.
A tank is filled with oil (specific gravity 0.8) and water to a depth of 10 meter and 6 meter respectively. Find the resultant force from all fluids acting on the gate of 1.8 meter by 9 meter.
Draw the FBD and the shear and bending moment diagrams. Label all minimums, maximums and zero crossing points as well as the slopes as constant, linear or parabolic.
The motion occurs in the horizontal x-y plane. Determine the velocity V2 of the particle at the end of the 3-s interval.
What additional data and information should he gather,and how should he go about gathering the data information ?
how kinematic and diffusion wave model been used for rainfall runoff modelling. main computer programme involved.
Assume that there were 1,100,000 vehicles making a 28.5-mi round trip per day, the average vehicle emission rate for VOCs is 1.3 g/VM , and the molecular weight of the VOC emissions from the mobile sources can still be represented by that of metha..
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
The Earth's surface creates a boundary layer in the atmosphere. The velocity profile near the surface can be expressed as a power law, u = a * y n, where the constants a and n depend on the roughness of the surface.
The tape is stretched over three equal spans. Calculate the tape corrections under the following conditions at field, temperature = 85ºF, pull = 18kg, E= 2.109 x 10 6 kg/cm 2
for this purpose replace this force by its equivalent of two forces at At Ft parallel and Fn perpendicular to the beam. Determine Ft and Fn.
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