13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for À < 1 µm and a = 0.3 for à > 1 µm. The bottom ofthe surface is well insulated, while the top may be exposed to one of two different conditions.Eps Tph, Th, TTTCase (a)Case (b)(a) In case ( a) the surface is exposed to the sun, which provides an irradiation of G s = 1200 W/m2, and to an airflow forwhich T, = 30o K. If the surface temperature is T = 320 K, what is the convection coefficient associated with the airflow?

GivenGs=1200W/m2T∞=300KTs=320k

Answered: 13.79 The spectral absorptivity of a…

Elements Of Electromagnetics

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A drying oven consists of a long semicircular duct of diameter D=1 m. Materials to be dried cover the base of the oven while the wall is maintained at 1200 K. Length of the oven (into paper direction) is 1 m. Water coated material is maintained at 325 K. Assume both the wall and the material to be blackbodies. (1) What is heat transfer rate? (2) Given at temperature 325 K, water needs heat 2.378 × 106 J/kg in order to be dried (from liquid water to steam). How much water can be dried per second based on the heat transfer rate from (1)? T₁ = 1200 K T₂ = 325 K — D = 1 m D= m→
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1. A glass window allows 95% of radiant energy between 0.32 < 1 < 2.6 microns to pass. Any wavelength outside of this range will not pass through the glass. Compute the energy rate passed through the glass window if the incident energy rate on the glass is 1200 W/m^2. 0.9 0.4 E0-a ot 0.4 0.2 0.1 15,000 AT(Micron-Rankine) S000 10,000 20.000 25,000 30,000 33,000 00 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Amax Ans. 1026 W/m^2
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1) The spectral, hemispherical absorptivity of an opaque surface and the spectral irradiation at the surface are as shown. d' 1.0 G₂ (W/m².um) 500 0.2 0 0 0 2 4 6 8 10 12 14 16 0 2 4 6 8 10 12 14 16 λ(μm) λ(μm) a) How does the spectral, hemispherical reflectivity vary with wavelength? b) What is the total, hemispherical absorptivity of the surface? c) If the surface is initially at 500 K and has a total, hemispherical emissivity of 0.8, how will its temperature change upon exposure to the irradiation?
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3. A star has a surface temperature of 5,500K. Determine the radiative heat transfer received by planet Z in Petawatts with diameter of 2100 km, temperature of surface of 300K and mean absorptivity of 0.8. Radiative energy loss due to radiation dispersion on outer space is 99%.
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2. An UV stepper (Exposure Machine) has a NA numerical aperture of 0.3 and uses a light source with a wavelength of 436nm. What is the minimum feature size you would expect the stepper to be able to produce? What would be the maximum thickness of resist that the stepper could successfully expose?
6.4 Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K. The plates are made from the same metal, and their spectral emissivities as a function of wavelength, &, are approximated as shown by two constant values joined by a linear decrease with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2. What is the energy flux if both plates are assumed gray with an approximate average emissiv- ity of 0.5 applied over the entire spectral range? 91 T₁ = 1400 K, Ex T₂ = 700 K, EX 92-91 0.85 Ex 0.15 0 Answer: q₁106,850 W/m²; 91.gray = 68,070 W/m². 2 λ (μm) 7

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13.79 The spectral absorptivity of a large diffuse surface is a = 0.9 for à < 1 µm and az = 0.3 for à > 1 µm. TI he surface is well insulated, while the top may be exposed to one of two different conditions. Ep Tp h, T h, T T- T תיצפלועיייו Case (a) Case (b) TATI