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Wind speed 10 m Air Temperature Surface Temperature 10 m Specific Humidity 9a Surface Spec Humidi...
The average wind speed is 6 m/s at a 10-m-high anemometer. Estimate the average power density...
The average wind speed is 6 m/s at a 10-m-high anemometer. Estimate the average power density in the wind at a height of 80 m. Assume Rayleigh statistics, a standard friction coefficient α = 1/7, and standard air density ρ = 1.225 kg/m3.
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 1...
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 10°C. 1) Calculate the avg. heat transfer coefficient along the 10 m width of the wall. 2) Calculate the local heat transfer coefficient at a location 10 cm from the leading edge of the wall. (25pts)
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C...
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transfe...
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transferred to the body. What does this amount of heat represent? Q2. (a) (5 marks) A wall ofa room is made of lightweight concrete material (ρ= 1600 kg/m.に0.79 W/m K and cp 0.84 kJ/kg K) with a thickness of 150 mm. Initially the wall is...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature of the wire is T.-11.0°C during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 40 km/h, which is the heat loses in one kilometer of transmission line. Air properties: p= 1.246 kg/m”, k = 0.02439 W/m. C, u=1.426x10* mºis, Pr = 0.7336 Wind, 40 km/h 100/14 Transmission lines
b. A very thin wing section is being tested in a low speed wind-tunnel. Assuming that...
b. A very thin wing section is being tested in a low speed wind-tunnel. Assuming that the flow on the surface of the wing produce a laminar boundary layer and the velocity profile is given as follows; Determine the theoretical value of; 8" where Rex is the Reynold number at a distance x from the leading edge of the wing, Rei is the Reynolds number at the trailing edge of the wing and Cr (or Cp) is the average skin...
1 = Consider a part with volume V = 5 x 10-6 m’, surface area A...
1 = Consider a part with volume V = 5 x 10-6 m’, surface area A = 1x10-3 m², mass density P 5000 kg m-3, heat capacity Cp 500 J kg-1 K-1. The part initially has a uniform temperature of Tp : 500 °C. It is suddenly immersed in a fluid at To 25 °C with a heat transfer coefficient of h 20 W m = = -2 K-1 = Based on a control volume that encompasses the part and...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a manometer (manometer fluid is water with...
5. (4x5pts = 20pts) An anemometer mounted 10 m above a surface with crops, hedges, and...
5. (4x5pts = 20pts) An anemometer mounted 10 m above a surface with crops, hedges, and shrubs, shows a wind speed of 5 m/s. Assuming 15°C and 1 atm pressure, determine the following for a wind turbine with hub height 80 m and rotor diameter of 80 m: V top - - 80 m 120 m V bottom - 80 m 5 m/s 40 m 10 m Crops, shrubs, hedges FIGURE P7.2 a. Estimate the wind speed and the specific...
Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section Inlet 9) For the air wind...
Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section Inlet 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7| Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in...
40. The atmospheric pressure (force per unit area) on a surface at an altitude z is due to the we...
problem 40 with parts
40. The atmospheric pressure (force per unit area) on a surface at an altitude z is due to the weight of the column of air situated above the surface. Therefore, the difference in air pressure p between the top and bottom of a cylindrical volume element of height Az and cross-section area A equals the weight of the air enclosed (density ρ times volume V-: ΑΔε times gravity g), per unit area: Let Δ、→0 to derive...
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C and wall 1) surface is at 10°C. 1) Calculate the avg. heat transfer coefficient along the 10 m width of the wall. 2) Calculate the local heat transfer coefficient at a location 10 cm from the leading edge of the wall. (25pts)
Wind is blowing at 5 km/h over a building wall of size 5 mx10 m. Air temperature is 0°C...
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transferred to the body. What does this amount of heat represent? Q2. (a) (5 marks) A wall ofa room is made of lightweight concrete material (ρ= 1600 kg/m.に0.79 W/m K and cp 0.84 kJ/kg K) with a thickness of 150 mm. Initially the wall is...
A 6-mm-diameter electrical transmission line carries an electric current of 50 A. If the surface temperature of the wire is T.-11.0°C during a windy day when the air temperature is 10°C and the wind is blowing across the transmission line at 40 km/h, which is the heat loses in one kilometer of transmission line. Air properties: p= 1.246 kg/m”, k = 0.02439 W/m. C, u=1.426x10* mºis, Pr = 0.7336 Wind, 40 km/h 100/14 Transmission lines
b. A very thin wing section is being tested in a low speed wind-tunnel. Assuming that the flow on the surface of the wing produce a laminar boundary layer and the velocity profile is given as follows; Determine the theoretical value of; 8" where Rex is the Reynold number at a distance x from the leading edge of the wing, Rei is the Reynolds number at the trailing edge of the wing and Cr (or Cp) is the average skin...
1 = Consider a part with volume V = 5 x 10-6 m’, surface area A = 1x10-3 m², mass density P 5000 kg m-3, heat capacity Cp 500 J kg-1 K-1. The part initially has a uniform temperature of Tp : 500 °C. It is suddenly immersed in a fluid at To 25 °C with a heat transfer coefficient of h 20 W m = = -2 K-1 = Based on a control volume that encompasses the part and...
9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7 Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in the test section with a manometer (manometer fluid is water with...
5. (4x5pts = 20pts) An anemometer mounted 10 m above a surface with crops, hedges, and shrubs, shows a wind speed of 5 m/s. Assuming 15°C and 1 atm pressure, determine the following for a wind turbine with hub height 80 m and rotor diameter of 80 m: V top - - 80 m 120 m V bottom - 80 m 5 m/s 40 m 10 m Crops, shrubs, hedges FIGURE P7.2 a. Estimate the wind speed and the specific...
Honeycomb Flow Straightener Anti-Turbulence Screens Silencer Fan Diffuser Test Section Inlet 9) For the air wind tunnel shown above in Q8: (6 points) Assuming a circular cross section, the atmospheric pressure is 101.325 kPa, density of air is 1.2 kg/m², and absolute viscosity of air is 1.825*10-Ns/m² (assume there are no losses in the wind tunnel) Contraction ratio: 7| Diffuser length: 3 m Test section diameter = test section length = 70 cm a) When a static-pitot tube placed in...
problem 40 with parts
40. The atmospheric pressure (force per unit area) on a surface at an altitude z is due to the weight of the column of air situated above the surface. Therefore, the difference in air pressure p between the top and bottom of a cylindrical volume element of height Az and cross-section area A equals the weight of the air enclosed (density ρ times volume V-: ΑΔε times gravity g), per unit area: Let Δ、→0 to derive...
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