Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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The wind turbine (60 meter diameter) is at sea level, but it is ina windier place. How much total power would it receive from thewind if it blowing at 20 meters per second?Why can’t a wind turbine with 60 meter blades actually producethis much power in 20 m/s winds?
A large commercial wind turbine has a blade span of 100 m and tower (4 m diameter uniform) height of 150 m high (hub height above the ground). If the combined turbine-generator efficiency of 40%, wind speed of 15 km/h and the air density 1.2 kg/m3 (disregard frictional effects on the mast) determine the following:a) Electrical power generated by the turbine (in MW).b) Total horizontal force (kN) exerted by the wind on the supporting mast of the turbine and the distance (m) of this resultant force from the ground. Assume uniform tower diameter throughout the height.c) What will be the electrical power generated (in MW) when the wind speed is 30 km/h
A coal-fired power plant with effective stack height of 100 m emits 1.2 g/s of SO2 per megawatt of power delivered. If winds are assumed to be 4 m/s at that height and just over 3 m/s at 10 m, how big could the plant be (MW) without having the ground level SO2 exceed 365 ug/m3?
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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 is a better site 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 ρ = 1.25 kg/m3]arrow_forwardA coal-fired power plant with effective stack height of 100 m emits 1.2 g/s of SO2 permegawatt of power delivered. If winds are assumed to be 4 m/s at that height, how big couldthe plant be (MW) without having the ground level SO2 exceeds 365 μg/m3 at 2 km downwind?arrow_forward1. On a particular day, the wind speed is 2 m/s at a height of 10 m. Estimate the wind speed at heights of 100 m and 300 m if the power law exponent on the velocity profile is 0.15 (level ground, little cover). Repeat the estimates for an exponent of 0.4 (urban area). 2. The wind speed over an urban area is 10 m/s at a height of 10 m. Estimate the wind speed at a height of 30 m.arrow_forward
- A 35 percent-efficient coal-fired power plant with effective height of 100 m emits SO2 at a rate of 0.6 lb/10^6 Btu into the plant. If winds are assumed to be 4 m/s at the stack height and just over 3 m/s at 10 m, how large could the plant be (MW) without having the ground level SO2 exceed 365 micrograms/m^3?arrow_forwardThe ground level wind velocity at 10m elevation is 8 miles/hr in a city. What would you estimate the velocity to be at 100m elevation, in miles per hour, if there is a B stability class which means the value of the urban exponent (ρ) = 0.15arrow_forwardSulfur dioxide is being emitted in a rural area at a rate of 0.90 kg/s from a stack with an effective height of 220 m. The average wind speed at a stack height is 4.8 m/s and the stability category is B. Determine the short time period, downwind, centerline concetrration in micrograms per cubic meter at ground level distances from the stack of (a) 0.6 and (b) 0.8 km.arrow_forward
- a wind energy generator generates 1150w at rated speed of 20mph at the atmospheric pressure and temperature at 20deg c. calculate the change of output if wind generator is operates altitude of 1800m temperature 10deg c.wind speed 30mph,atmospheric pressure 0.88atm. area=? power generated for 1800m=?arrow_forwardyou are tasked to supervise the design of 0.5MW wind turbine to be constructed in the Wind Farm in Pililla, Rizal. Suppose the design criteria are as follows: The air density as surveyed after 2 year period averaged at 1.225 kg / cubic meter; the sweeping diameter of the rotor blades is 125m; and the anemometer reading in the area amounts to 4.2m/s on a 2 year period of survey. What is the theoretical power output of the turbine assuming 100% efficiency of operation? Your answer must be in kW and in two decimal places with correct signs.arrow_forwardA windmill is operating in a 10m/s wind that has a density of 1.2kg/m3. The diameter of the windmill is 4m. The constant-pressure (atmospheric) streamline has a diameter of 3m upstream of the windmill and 4.5m downstream. Assume that the velocity distributions are uniform and the air is incompressible. Determine the thrust on the windmill.arrow_forward
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