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A wind turbine with a diameter of 100 ft operates during a 24-h period in which the wind velocity may be approximated by half a sine wave as V(theta)=V(m)sin(pi*theta/24), where theta is time in hours and V(m)= 10^5 ft/h. The wind density is 0.076 lbm/ft^3. Calculate (a) the theoretical maximum turbine energy during that 24-h period, in foot-pound force and kilowatt hour, and (b) the wind mean energy velocity, in feet per hour.
determine the slenderness ratio of a 5 m column with built end if its cross section is a circular with a radius of 40 mm and b 50 mm square use the concept of effective length.
Steam at 3 MPa, 400C enters a turbine with a volume flow rate of 5 m^3/s. An extraction of 15% of the inlet mass flow rate exits at 600 KPa, 200C. The rest exits the turbine at 20KPa with a quality of 90% and a velocity of 20 m/s. Determine the volum..
consider a l0-plate fuel cell stack at an anode stoichiometry of 1.2 with 20 a current generated in the stack and a
1 steam at 3 mpa and 400 c enters an adiabatic nozzle steadily with a velocity of 40 ms and leaves at 2.5 mpa and 300
it is proposed to build a 1000mw electric power plant with steam as the working fluid. the condensers are to be cooled
Determine the internal normal force, shear force, and moment at point C in the simply supported beam. Point C is located just to the right of the 1500 couple moment.
a gas refrigeration system uses helium as the working fluid operates with a pressure ratio of 3.5. the temperature of
problem 1 air at 29.5ordmc db flows over a cooling coil and leaves it at a state of 13ordmc db and 8.5 gkg absolute
An air compressor is designed to compress ambient (assumed to be 100 kPa, 20C) to a pressure 1 MPa. The heat transfer rate to the ambient is anticipated to be equal to 10% of the power input to the compressor.
it is found that 10 btus of heat must be supplied to a house in order to maintain its temperature at 70of when the
A large plastic casting with thermal diffusivity 6.0 x10^7 m2 /s is removed from its mold at a uniform temperature of 150 degrees C. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temper..
sun a 5800 k transfers heat to earth at an average rate of 1360 w per m2 of surface area of earth. the earth has a
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