Consider radiation from a small surface at 100 oC which is enclosed by a much larger surface at24 o C. Determine the percent increase in the radiation heat transfer if the temperature of the smallsurface is doubled.
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Consider radiation from a small surface at 100 o
C which is enclosed by a much larger surface at
24 o C. Determine the percent increase in the radiation heat transfer if the temperature of the small
surface is doubled.
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Solved in 2 steps
- Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.8.15 A mercury bath at is to be heated by immersing cylindrical electric heating rods, each 20 cm tall and 2 cm in diameter. Calculate the maximum electric power rating of a typical rod if its maximum surface temperature is .
- A 1.2 m wide and 5.1 m long solar collector is mounted to a roof. Now the average surface temperature of the solar collector is measured to be 50 oC. The effective surrounding sky temperature is 8 oC. If the emissivity of the collector is 0.88, determine the rate of heat transfer from the collector to the surroundings due to radiation.Two plates are separated by two radiation shields with emissivities of 0.10 and 0.15for both sides. The two plates are said to have maintained uniform temperatures600 K (emissivity = 0.6) and 300 K (emissivity = 0.7). Calculate the net rate of heattransfer (W/m2) between the two plates with and without the shields per unitsurface area. Determine the rate of heat transfer (W/m2) between the two plateswhen one plate (emissivity = 0.10) is removed. Assume that the temperatures ofradiations shield are in steady operation.A certain body at 20C is displayed on a top of a building during the night. The body sees nothing but the sky which has an effective temperature of 110K. Determine the heat transfer rate from the body to the sky if the body temperature is maintained at 23C, the surface emissivity of the body is equal to 0.92, and none of the radiation going out of the comes back
- Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.7, and surface temperature is 32°C. Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of (a) 300 K and (b) 280 K.Two identical bodies radiate heat to each other. One body is at 30°C and the other at 250°C. The emissivity of both is 0.7. Calculate the net heat transfer per square meter. ANSWER: 2635 WA man is working in a chamber enclosed with black walls. If the air around the worker is at 20oC, the walls are at 100oC, and the heat transfer coefficient between the worker and the air is 15 W/m2-oC, what temperature will the worker feel? Assume the radiation emissivity of the worker’s cloth is about 0.8.
- Consider a surface at a uniform temperature of 800 K. Determine the maximum ratioof thermal radiation that can be emitted by this surface, in W / m2A flat-plate collector with one glass cover is placed in horizontal. The absorber plate temperature is 95 oC and its emittance is 0,12. The glass cover temperature is 45 oC, and the (glass) cover has an emittance of 0.85. The plate-cover spacing is 15 mm. The ambient and surrounding temperature are equal at 25 oC. The wind velocity is 20 km/hour. If solar radiation is 850 W/m2 , and the plate absorptivity is 95%, calculate over all heat transfer coefficient losses and the useful energy (W/m2 ). ----- sA radiator in a domestic heating system operates at a surface temperature of 55°C. Assuming the radiator behaves as a black body, the rate at which it emits the radiant heat per unit area is (assume o = 5.67 x 10-8 W/m²K4)