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- To avoid the bulky tower and impeller and generator inthe HAWT of the chapter-opener photo, we could insteadbuild a number of Darrieus turbines of height 4 m anddiameter 3 m. (a) How many of these would we need tomatch the HAWT’s 100 kW output for 15 m/s wind speedand maximum power? (b) How fast would they rotate?Assume the area swept out by a Darrieus turbine is twothirdsthe height times the diameter.The penstock of hydroelectric turbine is 0.5m x 0.5m with velocity of 5.5m/s and head of 20m. What is the output of the turbine if the turbine efficiency is 92%?1. A turbine is fed from a mountain reservoir 300 metres above it. Calculate the drop in massspecific energy (neglecting kinetic energy) between the reservoir and the turbine, andcalculate the volumetric flow rate required for 10MW of power to be extracted.
- The design of a new dam reveals that a water head of 10 meter and water flow rate of 100 cubic meter per second (m3/s) can be supplied for electricity generation. What kind of turbines would you recommend for the electric power generation?What is the flow rate of water through the system shown for the turbine to produce 20 kW. Neglect friction in your calculations. Q=10.75m3/s, P=204kw/273hpA Francis radial-flow hydroturbine has the following dimensions, where location 2 is the inlet and location 1 is the outlet: r2 = 6.60 ft, r1 = 4.40 ft, b2 = 2.60 ft, and b1 = 7.20 ft. The runner blade angles are ?2 = 82° and ?1 = 46° at the turbine inlet and outlet, respectively. The runner rotates at n. = 120 rpm. The volume flow rate at design conditions is 4.70 ×106 gpm. Irreversible losses are neglected in this preliminary analysis. Calculate the angle ?2 through which the wicket gates should turn the flow, where ?2 is measured from the radial direction at the runner inlet. Calculate the swirl angle ?1, where ?1 is measured from the radial direction at the runner outlet. Does this turbine have forward or reverse swirl? Predict the power output (hp) and required net head (ft).
- Pls show detailed solution Example 2.2A typical industrial-scale wind turbine has a peak efficiency of about 0.44 for a wind speed of 9 m·s−1. That is, it converts about 44% of the kinetic energy of the wind approaching it into usable electrical energy. The total air flow impinging on such a turbine with a rotor diameter of 43 m is about 15,000 kg·s−1 for the given wind speed. a) How much electrical energy is produced when 1 kg of air passes through the turbine?(b) What is the power output of the turbine?(c) If there is no heat transferred to the air, and if its temperature remains unchanged, what is its change in speed upon passing through the turbine?..Consider a leather belt with the following given: width of 100 mm, thickness of 6.4 mm, velocity of 18.3 m/s. Which of the following is the centrifugal force across the belt? Note that the density of belt is approximately 974 kg/m3Group of answer choices 205 N 309 N 209 N 305 NA horizontal jet of water issues from a nozzle 7.5 cm diamter under an effective head of 67.5 m and strikes a vertical plate. Find the dyanmic thrust on plate if the plate is moving parallel to itself at 6m/s. Take Cv for the nozzle as unity.
- A turbine develops 144 HP running at 100 rpm under a head of 7.7 meters. After resolving the turbine speed, what horsepower would be developed under a head of 11 meters?A Pelton wheel has to develop 12 MW under a head of 300 m at a speed of 500 rpm. If the diameter of the jet is not to exceed 1/9 of the wheel diameter, calculate the quantity of flow and no. of jets. Assuming eo = 85%, Cv = 0.97, and Ф = 0.45.1. A horizontal jet of water issues from a nozzle 7.5 cm diameter under an effective head of 67.5 m and strikes a fixed vertical plate. Find the dynamic thrust on the plate. Take Cv for the nozzle as unity. 2. Same as in Problem No.1, except that the plate is moving parallel to itself at 6 m/s.