alculate the rate at which radiant energy is flowing in Watts (W) from the radiator's 1.5 m? surface if the surface is polished iron at 65\deg C.
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Calculate the rate at which radiant energy is flowing in Watts (W) from the
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- An infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.An astronaut performing an extra-vehicular activity (space walk) shaded from the Sun is wearing a spacesuit that can be approximated as perfectly white ( e=0 ) except for a 5 cm × 8 cm patch in the form of the astronaut's national flag. The patch has emissivity 0.300. The spacesuit under the patch is 0.500 cm thick, with a thermal conductivity k 0.0600 W/m , and its inner surface is at a temperature of 20.0 . What is the temperature of the patch, and what is the rate of heat loss through it? Assume the patch is so thin that its outer surface is at the same temperature as the outer surface of the spacesuit under it. Also assume the temperature of outer space is 0 K. You will get an equation that is very hand to solve in closed form, so can solve it numerically with a graphing calculator, with software, or even by trial and error with a calculator.(a) Cherry-red embers in a fireplace are at 850ºC and have an exposed area of 0.200m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0ºC. If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts? (b) Does your answer support the contention that most of the heat transfer into a room by a fireplace comes from infrared radiation?
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- (a) Cherry-red embers in a fireplace are at 850ºC and have an exposed area of 0.200 m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0ºC . If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts? (b) Does your answer support the contention that most of the heat transferinto a room by a fireplace comes from infrared radiation?The total rate at which power is used by humans worldwideis approximately 15 TW (terawatts). The solar flux averagedover the sunlit half of Earth is 680 W>m2 (assumingno clouds). The area of Earth’s disc as seen from the Sun is1.28 * 1014 m2. The surface area of Earth is approximately197,000,000 square miles. How much of Earth’s surfacewould we need to cover with solar energy collectors to powerthe planet for use by all humans? Assume that the solar energycollectors can convert only 10% of the available sunlightinto useful power.What is the average energy contained in a 1.00 m3volume near the Earth’s surface due to radiant energyfrom the Sun?
- The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2, calculate the temperature of the filament, if the power radiated by filament is 11.4 watt.A 50W incandescent ligh bulb (spherical in shape) has a surface temperature of 140deg C when the room air temperature is at 22 deg C. The light bulb has 65mm in diameter and the emissivity is 0.78. What is the radiant heat transfer?Determine the wavelength of the maximum amount of radiation emitted by surface at 49 °C. Express your answer with the appropriate units. Tempjetes Symbole undo redo Teset keyboard shortcuts help Xmax= Value Units