The water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at a location where the depth of the water is 50 m. Water is to be supplied at a rate of 5000 kg/s. If the electric power generated is measured to be 1862 kW and the generator efficiency is 95 percent The power in the shaft is Select one: O a. 1962 KW b. 2455 KW

The water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at a location where the depth of the water is 50 m. Water is to be supplied at a rate of 5000 kg/s. If the electric power generated is measured to be 1862 kW and the generator efficiency is 95 percent The power in the shaft is Select one: O a. 1962 KW b. 2455 KW

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.19P

See similar textbooks

Similar questions

A mining company depleted more than half of its ore reserves and is no longer using all of its shaft infrastructure. It considers using one of the old shafts for pumped-storage hydro-electricity generation. This means that water will be pumped to the higher level, which is 1 000 m above the bottom level, at night when Eskom charges lower, off-peak, rates. The “higher level” will be changed into a dam (reservoir) by means of plugs that will be installed in some tunnels. The stored water has potential energy, which will be used to generate electricity for the mine at peak hours, when electricity is expensive. The pump that will be installed at the bottom of the column will also be used as a turbine for the generation of electricity The pump-as-turbine (PAT) must pump water to a height of 1 000 m through a column with an internal diameter (ID) of 345 mm. 3.1. Calculate the velocity of the water in the pipe if the quantity of water to be pumped is 220 litres per second (lps). 3.2.…
Q6) (a) Two sites are being considered for wind power generation. In the first site, the wind blows steadily at 7 m/s for 3000 hours per year, whereas in the second site the wind blows at 10 m/s for 2000 hours per year. Assuming the wind velocity is negligible at other times for simplicity; determine which a better site is for wind power generation. Hint: Note that the mass flow rate of air is proportional to wind velocity. (Take the density of air to be ? = 1.25 kg/m3).
Air enters a fan through a duct velocity of 6.3 m/s and an inlet static pressure of 2.5cm of water less than the atmospheric pressure. The air leaves the fan through the duct at a velocity of 11.25 m/s and a discharge pressure of 7.62cm of water above the atmospheric pressure. If, the density of the air is 1.2kg/m3and the fan delivers 9.45m3/s, what is the fan efficiency when the power input to the fan is 13.75 kW at the coupling. Show schematic diagram and provide solutions.
23 - Where atmospheric conditions are 100 kPa and 20 ºC, there is air at a pressure of 103 kPa in a tank. The 6 cm diameter plug in the tank is opened. Determine the maximum airflow through the hole? (R=0.287 J/kgK) a) 0.122 m³/h B) 0.145 m³/h NS) 0.133 m³/h D) 0.197 m³/s TO) 0.098 m³/s
on the island, hydropower is expected to be extracted from a river of the river system via a pipe, 74 m long, to a turbine.During the dry season, from February to May the average daily flow rate of the river is 35 m3s-1 and for the remaining 8 months, the average daily flow rate of the water is 115 m3s-1. Assume, the initial capacity expenditure evaluated on a yearly basis of the run of a river system is $900 000, the annual operating cost is $17 500; and the density of water is 1000 kg ∙m-3.Considering the run of the river system above, determine(i) the energy potential at the source for one year,(ii) the levelized cost of electricity, and(iii) compare the LCOE value and the cost of electricity, and comment on the capital investment.
In a turbo-jet engine the momentum of the gases leaving the nozzleproduces the propulsive force. The enthalpy and velocity of the gases atthe nozzle entrance are 1200 KJ/Kg and 200 m/s respectively. Theenthalpy of the gas at exit is 900 KJ/Kg. If the diameter of the nozzle at exitis 500 mm and the gas density at the nozzle inlet and exit are 0.81 kg/m 3and 0.39 kg/m 3 respectively. Determine the diameter of the nozzle at inlet.
In climates with low night-time temperatures, an energy-efficient way of cooling a house is to install a fan in the ceiling that draws air from the interior of the house and discharges it to a ventilated attic space. Consider a house whose interior air volume is 720 m3 If air in the house is to be exchanged once every 20 minutes, determine (a) the required flow rate of the fan and (b) the average discharge speed of air if the fan diameter is 0.5 m..
Electric power is generated in the hydroelectric power plant with a turbine-generator system, which has a water input of 45 m3 per second from a height of 53 meters and operates with 73% efficiency. Calculate the electrical power generated in the plant since the friction loss in the pipes is neglected. A) 1,7 MW B) 17 MW C) 32 MW D) 171 MW E) 23 MW
A hydroelectric power plant is used to convert energy from flowing water initially stored in a reservoir at an elevation of 186 ft from the turbine inlet. Electric power is generated in the turbine-generator system with overall turbine–generator efficiency of 87.21 percent, determine the minimum flow rate (in cubic feet per second) required to generate 121 kW of electricity.
A Francis turbine rotates at 1600 rpm and a flow rate of 1 m3/sec enters it. The inlet and outlet diameters are 1.2 m and 0.55 m, respectively, and the corresponding sections between the blades are 0.24 m2 and 0.08 m2. The outlet angle of the water from the distributor is 10º, the outlet angle of the wheel b2 = 40º and the manometric efficiency of the turbine is 78%.Determine:a) The net jumpb) The torque and power on the shaft
Water at 60 deg. F is pumped from a reservoir to the top of a mountain through a 6-in SCH 120 pipe at an average velocity of 12 ft/s. The pipe discharges into the atmosphere at a level 3000 ft above the level in the reservoir. The pipeline itself is 4500 ft. long. If the overall efficiency of the pump and the motor driving it is 70% and the cost of electric energy to the motor is 4 cents per kilowatt-hour, 2. what is the theoretical power consumption in hp? 373755575557337733none of the given
In an hydroelectric plant, 100 m^3/s of water flows from elevation of 120 m to a turbine, where electric power is generated. The overall efficiency of the turbine-generator is 80 percent Disregarding frictional losses in piping. Estimate the electric power output of this plant.