The solar radiation incident on the outside surface of an aluminum shading device is 1300 W/m2...
The solar radiation incident on the outside surface of an aluminum shading device is 1300 W/m2 . Aluminum absorbs 10% of the incident solar energy, and dissipates it by convection from the back surface and by combined convection and radiation from the outside surface. The convection heat transfer coefficient is 10 W/m2 ·K for both surfaces, and the ambient/surrounding temperature can be taken 20 °C for both convection and radiation. Assuming that the aluminum shade has a uniform temperature, determine the temperature of the aluminum shading device if it is 1. Polished, and 2. Oxidized.
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The solar radiation incident on the outside surface of an
aluminum shading device is 1300 W/m2...
A solar roof is absorbing the radiation from the sun at the rate of 1300 W/m2....
A solar roof is absorbing the radiation from the sun at the rate of 1300 W/m2. A solar cell on that roof has a size of 12 m2 and produces 1.6 kW of electrical power. What is the conversion efficiency of the solar cell?
A wall panel is insulated on the back and exposed to solar radiation on the front...
A wall panel is insulated on the back and exposed to solar radiation on the front surface. The exposed surface of the plate has an absorptivity α = 0.8 for radiation (i.e. 80% of radiant energy is absorbed). Solar radiation arrives to the panel at a rate of 1 kW⁄m2. The panel emissivity ϵ = 1 and the surrounding air temperature is 25°C. a. If we assume radiation is the only mechanism of heat transfer, in this scenario determine the...
5 The roof of a car in a parking lot absorbs a solar radiant flux of...
5 The roof of a car in a parking lot absorbs a solar radiant flux of 800 W/m2 and the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 12 W/m2.K. (a) Neglecting radiation exchange with the surroundings, calculate the temperature of the roof under steady state conditions if the ambient air temperature is 20°C. (b) For the same ambient air temperature, calculate the temperature of the roof if its surface emissivity is 0.8.
The lower surface of a horizontal aluminum plate 5 in. by 7 in. is heated by...
The lower surface of a horizontal aluminum plate 5 in. by 7 in. is heated by an electric resistance heater that supplies 10 W. The upper surface is cooled by free convection and radiation. The convective transfer coefficient is 1.2 Btu/hr ft2 °F and the air temperature is 70 °F. Surrounding room surfaces are also at 70 °F. Find the surface temperature of the aluminum if it is a) clean and shiny with ε=0.05 b) painted with ε=0.9
Question 3 Answer saved Solar radiation with intensity of 959 W/m2 is incident on a solar...
Question 3 Answer saved Solar radiation with intensity of 959 W/m2 is incident on a solar thermal collector. The collector cover has transmission coefficient of 0.95 and the collector absorber has an absorption coefficient of 0.90. How much solar radiation per unit area is absorbed by the absorber? Give your answer in W/m2 rounded to 2 decimal places. Marked out of 1.5 P Flag question Answer:
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
An aluminum plate with a thickness of L=5 mm is mounted in a horizontal position, and...
An aluminum plate with a thickness of L=5 mm is mounted in a horizontal position, and its bottom surface is well insulated. A special, thin coating (with emissivity and solar absorptivity of 0.25) is applied to the top surface. The density ρ and specific heat c of aluminum are known to be 2700 kg/m3 and 900 J/kg · K, respectively. Consider conditions for which the plate is initially at a temperature of ??????=25 °C and its top surface is suddenly...
On a clear day, the total intensity of solar radiation incident at the Earth's surface is...
On a clear day, the total intensity of solar radiation incident at the Earth's surface is approximately 1000W/m2 Part a Assume our atmosphere absorbs 23% of the incoming solar radiation, and that the distance from the Earth to the Sun is 1.5 x 1011m. From this information, what do you expect is the total power output of the sun? [IMPORTANT: to express a number like 2 x 1021, type 2e21] Enter answer here O of 4 attempts used CHECK ANSWER...
At our distance from the Sun, the intensity of solar radiation is 1370 W/m2. The temperature...
At our distance from the Sun, the intensity of solar radiation is 1370 W/m2. The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the ef- fect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the...
An electronic device operates in air at an ambient temperature of 22°C with a convection heat...
An electronic device operates in air at an ambient temperature of 22°C with a convection heat transfer coefficient of 85 W m K- To enhance cooling, aluminium 2024-T6 fins of length 40 mm and cross-section 2 mm x 2 mm will be mounted on one surface of the device. The finned surface measures 45 mm x 64 mm and the other surfaces are insulated. The device dissipates 95 W of heat. (i) Calculate the rate of heat transfer through one...
5 The roof of a car in a parking lot absorbs a solar radiant flux of 800 W/m2 and the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 12 W/m2.K. (a) Neglecting radiation exchange with the surroundings, calculate the temperature of the roof under steady state conditions if the ambient air temperature is 20°C. (b) For the same ambient air temperature, calculate the temperature of the roof if its surface emissivity is 0.8.
Question 3 Answer saved Solar radiation with intensity of 959 W/m2 is incident on a solar thermal collector. The collector cover has transmission coefficient of 0.95 and the collector absorber has an absorption coefficient of 0.90. How much solar radiation per unit area is absorbed by the absorber? Give your answer in W/m2 rounded to 2 decimal places. Marked out of 1.5 P Flag question Answer:
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
On a clear day, the total intensity of solar radiation incident at the Earth's surface is approximately 1000W/m2 Part a Assume our atmosphere absorbs 23% of the incoming solar radiation, and that the distance from the Earth to the Sun is 1.5 x 1011m. From this information, what do you expect is the total power output of the sun? [IMPORTANT: to express a number like 2 x 1021, type 2e21] Enter answer here O of 4 attempts used CHECK ANSWER...
At our distance from the Sun, the intensity of solar radiation is 1370 W/m2. The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the ef- fect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the...
An electronic device operates in air at an ambient temperature of 22°C with a convection heat transfer coefficient of 85 W m K- To enhance cooling, aluminium 2024-T6 fins of length 40 mm and cross-section 2 mm x 2 mm will be mounted on one surface of the device. The finned surface measures 45 mm x 64 mm and the other surfaces are insulated. The device dissipates 95 W of heat. (i) Calculate the rate of heat transfer through one...
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