A small body with surface area 0.1 m^2 and emissivity 0.8 is placed inside a large cavity. What is the radiation resistance between the small body and the large cavity?
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- Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.A thin-walled cubical container that is 0.5 m by 0.5 m by 0.5 m is filled with ice water. The container is inside another .cubical container and the 3 cm gap between the containers is a vacuum. The outer surface of the inner container has an emissivity of 0.1 and a temperature of 1 C. The inner surface of the outer container has an emissivity of 0.3 and a temperature of 19 C. (a) What is the rate of heat transfer to the ice water? (b) If the container initially contains 1/2 ice and 1/2 water by volume, how long will it take for all the ice to be melted?Heat radiates from a small sphere suspended in a large room. The surfaceof the sphere of 1.5 sq. Ft. is at a temperature of 580 °F, and the insidesurfaces of the room are at a temperature of 80 °F. Assuming the emissivity ofthe sphere surface to be 0.30, calculate the radian-heat transfer in BTU/hr.
- 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 particular furnace is shaped like a section of a cone. The top surface of the furnace is uniformly heated by a resistance heater. During operation, the top surface is measured to be 800 K and the power supplied to the resistance heater is 1750 W/m². The sidewall of the furnace is perfectly insulated with & = 0.2. If the emissivity of the top and bottom surfaces are ε = 0.5 and ε = 0.7, respectively, determine the temperatures of the sidewall and the bottom surface of the furnace. A₁ A2 A3 →→D₂ = 20 mm D₁ = 40 mm L = 50 mmTwo parallel plates 0.5 m by 1.0 m are spaced 150 mm apart. One plate is maintained at 1,000 C and the other at 500 C. The emissivities of the plates are 0.20 and 0.50, respectively. The plates exchange heat with each other and only the plate surfaces facing each other are to be considered in the analysis. Find the net heat transfer rate to each other. Neglect other modes of heat transfer (conduction and convection). View Factor is based on the case shown below:
- A thin square steel plate, 10 cm on the side, is heated in a blacksmiths forge to a temperature of 800°C. if the emissivity is 0.60, what is the total rate of radiation of energy in Watts?Two surfaces make up an enclosure where surface 1 is flat and has area A₁, temperature T₁ and emissivity. Surface 2 is black and has temperature T₂. Show that the net power transfer rate (net heat flux) in W/m² at surface 1 is given by ε₂0 (T₁-T₂).According to an Atomic Energy Commissionreport, a hydrogen bomb can be approximated as a large fireball at a temperature of 7200 K. You are to assess theimpact if such a bomb exploded 5 km above a city. Assumethe diameter of the fireball to be 1 km, and the blast to last15 s. Investigate the level of radiation energy people, plants,and houses will be exposed to and how adversely they will beaffected by the blast.
- 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.A spherical radiator has a radius of 3ft and emissivity of 0.5. If radiates 6000 Btu/hr of heat at 3000R, what is the temperature of a surface affected by its 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.