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A radiator in space is designed to dissipate 1000 W/m2. If the coating on the radiator...
Problem 2: A radiator on a solar-powered satellite must dissipate the heat being generated in the satellite by radiating the heat into space. The radiator surface has a solar absorptivity of 0.37 and...
Problem 2: A radiator on a solar-powered satellite must dissipate the heat being generated in the satellite by radiating the heat into space. The radiator surface has a solar absorptivity of 0.37 and an emissivity of 0.83. What is the surface temperature when the required dissipation is 2500 W/m2 for each of the following conditions a) When the radiator is facing the sun, and the solar irradiation is 1353 W/m2. b) When the radiator is shielded from the sun, and...
A python can detect thermal radiation with intensity greater than 0.60 W/m2. A typical human body...
A python can detect thermal radiation with intensity greater than 0.60 W/m2. A typical human body has a surface area of 1.8 m2, a surface temperature of 30∘C, and an emissivity e = 0.97 at infrared wavelengths. What is the maximum distance from which a python can detect your presence? You can model the human body as a point source of radiation.
A horizontal plate made of an opaque material is subjected to an irradiation of 5200 W...
A horizontal plate made of an opaque material is subjected to an irradiation of 5200 W m2 on its upper surface. The edges and lower surface are well insulated. The upper surface of the plate is maintained at a steady temperature of 480 K. The plate has a total hemispherical absorptivity of 0.45. The spectral emissivity function of the plate material is given as f ι-05, 0 λ 3μm; ε,-07, 3μm1S 15 00, Find (a) the total ollowS: hemispherical emissivity...
4. A space boat is to be designed such that the solar radiation power on its sail counters the sun's gravitational...
4. A space boat is to be designed such that the solar radiation power on its sail counters the sun's gravitational force. Assume that total weight of the boat is 1000 kg Calculate the surface area of the sail Note: The mean distance between earth and sun is 1.5x1011m, the mass of the sun is 1.99x1030kg, the gravitational constant is 6.67x10-11m/s2, the total solar radiation power density on earth is 1.4 kW/m2
4. A space boat is to be designed...
Warm Up The surface of the Earth receives approximately 1000 W/m2 (Watts per square meter) of energy from the Sun....
Warm Up The surface of the Earth receives approximately 1000 W/m2 (Watts per square meter) of energy from the Sun. This number rises to about 1386 W/m2 in the upper atmosphere (r 6.4 x 106 m) The sun is 1 AU (1.496 x 1011 m) away Over what area is the Sun's energy spread at the Earth's distance? How much power is the Sun releasing?
Warm Up The surface of the Earth receives approximately 1000 W/m2 (Watts per square meter)...
An unglazed flat plate solar water heater is orientated perpendicular to the sun such that the in...
An unglazed flat plate solar water heater is orientated perpendicular to the sun such that the incident radiation reaching the plate is 1100 W/m2. The plate has a semi selective coating such that the plate absorptivity and emissivity is equal to unity for all wavelengths up to 2µm, and 0.13 for all λ > 2µm. Coolant flowing in the collector tubes removes heat at such a rate as to maintain the plate temperature at 80°C. Considering the sun to be...
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...
If you were to walk briefly in space without a spacesuit while far from the Sun...
If you were to walk briefly in space without a spacesuit while far from the Sun (as an astronaut does in the movie 2001, A Space Odyssey), you would feel the cold of space-while you radiated energy, you would absorb almost none from your environment. (a) At what rate would you lose energy? (b) How much energy would you lose in 49.8 s? Assume that your emissivity is 0.919, the Stefan-Boltzmann constant is 5.6704 x 10-8 W/m2-64 and your's surface...
The average temperature of the surface of the Earth is approximately 14◦C. What would the steady-state...
The average temperature of the surface of the Earth is approximately 14◦C. What would the steady-state temperature of the Earth be if there were no greenhouse effect — i.e. if the emissivity of the earth was independent of wavelength? Give your answer in ◦C. Note that the radius of the Earth is 6.38 106 m, and the intensity of sunlight at the Earth’s location is 1366 W/m2. Hint, how much power from the sun would strike a plate with the...
The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths...
The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of the cosmos at the rate of 11.7 W. HooRU's surface area is 1.55 m2 and the emissivity of its surface is 0.297 Ignore the radiation HooRU absorbs from the cold universe. What is HooRU's temperature? Number
Problem 2: A radiator on a solar-powered satellite must dissipate the heat being generated in the satellite by radiating the heat into space. The radiator surface has a solar absorptivity of 0.37 and an emissivity of 0.83. What is the surface temperature when the required dissipation is 2500 W/m2 for each of the following conditions a) When the radiator is facing the sun, and the solar irradiation is 1353 W/m2. b) When the radiator is shielded from the sun, and...
A horizontal plate made of an opaque material is subjected to an irradiation of 5200 W m2 on its upper surface. The edges and lower surface are well insulated. The upper surface of the plate is maintained at a steady temperature of 480 K. The plate has a total hemispherical absorptivity of 0.45. The spectral emissivity function of the plate material is given as f ι-05, 0 λ 3μm; ε,-07, 3μm1S 15 00, Find (a) the total ollowS: hemispherical emissivity...
4. A space boat is to be designed such that the solar radiation power on its sail counters the sun's gravitational force. Assume that total weight of the boat is 1000 kg Calculate the surface area of the sail Note: The mean distance between earth and sun is 1.5x1011m, the mass of the sun is 1.99x1030kg, the gravitational constant is 6.67x10-11m/s2, the total solar radiation power density on earth is 1.4 kW/m2
4. A space boat is to be designed...
Warm Up The surface of the Earth receives approximately 1000 W/m2 (Watts per square meter) of energy from the Sun. This number rises to about 1386 W/m2 in the upper atmosphere (r 6.4 x 106 m) The sun is 1 AU (1.496 x 1011 m) away Over what area is the Sun's energy spread at the Earth's distance? How much power is the Sun releasing?
Warm Up The surface of the Earth receives approximately 1000 W/m2 (Watts per square meter)...
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...
If you were to walk briefly in space without a spacesuit while far from the Sun (as an astronaut does in the movie 2001, A Space Odyssey), you would feel the cold of space-while you radiated energy, you would absorb almost none from your environment. (a) At what rate would you lose energy? (b) How much energy would you lose in 49.8 s? Assume that your emissivity is 0.919, the Stefan-Boltzmann constant is 5.6704 x 10-8 W/m2-64 and your's surface...
The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of the cosmos at the rate of 11.7 W. HooRU's surface area is 1.55 m2 and the emissivity of its surface is 0.297 Ignore the radiation HooRU absorbs from the cold universe. What is HooRU's temperature? Number
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