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Category > Math Posted 23 Apr 2017 My Price 7.00

Velocities at various points at the outlet

Please i need help on my homework. Am having a difficult time in solving these questions, please help me out thank you. 

 

 
1. Consider a fan located in a 3 ft * 3 ft square duct. Velocities at various points at the outlet
are measured, and the average flow velocity is determined to be 22 ft/s. Taking the air
density to 0.075 lbm/ft^3 estimate the minimum electric power consumption of the fan
2. motor.
Large wind turbines with blade span diameters of over 100m are available for electric
power generation. Consider a wind turbine with a blade span diameters of 100 m installed
at a site subjected to steady winds at 8 m/s. Taking the over-all efficiency of the wind
turbine to be 32 percent and the air density to be 1.25 kg/m3 generated by this wind
turbine. Also, assuming steady winds of 8 m/s during a 24-hour period, determine the
amount of electric energy and the revenue generated per day for a unit price of $0.09/kWh for electricity.
3. An adiabatic closed system on earth is accelerated vertically from rest to 25m/s and the
system is raised by a height of 110m. The system has a mass of 1.2 kg. If 1.8kJ of work is
put into the system, determine the change in internal energy in kJ/kg.
4. A power plant extracts potential energy from a river to provide electrical power. The
average amount of water flowing through the plant is 101,000lbm/s. The water intake for the
power plant is 676 ft above the exit valves. If the power plant produces 100,000 hp, what is
the efficiency of the power plant?

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ComputerScienceExpert
(11)
Status NEW Posted 23 Apr 2017 10:04 AM My Price 7.00

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