give 2 examples of radiation heat transfer. explain briefly
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give 2 examples of radiation heat transfer. explain briefly
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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.1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.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.
- Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.Calculate the amount of radiation emitted for a unit surface (1 m2 ) forthe following situations: (a) a hot pavement in Arizona at 50° C and ε ≈ 0.8, (b) a hood of a car at 40° C and ε ≈ 0.9, and (c) a sunbather at 38° C and ε ≈ 0.9. Express your answers in both SI and U.S. Customary units.Explain the following terms related to the radiation mode of heat transfer: Black body, emissive power, monochromatic emissive power, gray body, white body and opaque body.
- Q#01:a) Define Radiation and give at least 3 examples.b) Define Stefan-Boltzmann Law and emissivity. Is there any surface whose emissivity valueis greater than 1? If no, explain the reason.a) Define Stefan-Boltzmann Law and emissivity. b) Is there any surface whose emissivity value is greater than 1? If no, explain the reason.give sample problem with solution regarding interchange of radiations between two parelle vertical planes (heat transfer)
- A small circular surface of area A1=2 cm2located at the center of a 2-m-diameter sphere emits radiation as a blackbody at T1= 1000 K. Determine the rate at which radiation energy is streaming through a D2=1-cm-diameter hole located (a) on top of the sphere directly aboveA1and (b) on the side of the sphere such that the line that connects the centres of A1 and A2 makes 45° with surface A1. (c) Repeat it for a 4-m diameter sphere.Calculate the ratio of the radiant energy emitted from a surface at 37ºC and an adjacent surface of equal area and emissivity at 35ºC.Two very large parallel plates are kept at uniform temperatures T1=800 K and T2=500 K, and have emissivities ε1=0.2 y ε2=0.7, respectively, as shown in the figure. Determine the net rate of radiation heat transfer between the two surfaces per unit surface area of the plates.