13.49 A long, thin-walled horizontal tube 100 mm in diame-ter is maintained at 120°C by the passage of steamthrough its interior. A radiation shield is installedaround the tube, providing an air gap of 10 mmbetween the tube and the shield, and reaches a surfacetemperature of 35°C. The tube and shield are diffuse,gray surfaces with emissivities of 0.80 and 0.10,respectively. What is the radiant heat transfer fromthe tube per unit length?

Answered: Image /qna-images/answer/6420c0cf-f1f4-42fb-87f6-c360f0f60b64.jpg

Answered: ugh its interior. A radiation shieldi…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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12-37 Two concentric spheres of diameters D₁ = 0.3 m and D₂ = 0.8 m are maintained at uniform temperatures T₁ = 700 K and T₂ = 400 K and have emissivities &₁ = 0.5 and 82 = 0.7, respectively. Determine the net rate of radiation heat transfer between the two spheres. Also, determine the convec- tion heat transfer coefficient at the outer surface if both the sur- rounding medium and the surrounding surfaces are at 30°C. Assume the emissivity of the outer surface is 0.35.
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> 15 of 15 13.33 13-33 Consider a person whose exposed surface area is 1.9 m², emissivity is 0.85, and surface temperature is 30°C. Determine the rate of heat loss from that person by radiation in a large room whose walls are at a temperature of (a) 295 K and (b) 260 K.
Question 1 Heat is transferred from hot, freshly cooked pasta to cold water it is rinsed in through: Conduction Convection Radiation
13.60 A furnace is located next to a dense array of cryogenic fluid piping. The ice-covered piping approximates a plane surface with an average temperature of T, = 0°C and an emissivity of ɛ, = 0.6. The furnace wall has a temperature of T,= 200°C and an emissiv- ity of ɛ, = 0.9. To protect the refrigeration equipment and piping from excessive heat loading, reflective aluminum radiation shielding with an emissivity of E, = 0.1 is placed between the piping and the furnace wall, as shown in the schematic. Assume all surfaces are diffuse-gray. Dense piping Furnace wall Tf = 200°C, e = 0.9 array, T, = 0°C, = 0.6 Installation criterion TNS 30°C -Radiation shields, N €, = 0.1 If the temperature of the shield closest to the piping T,N must be less than 30°C, how many radiation shields, N, must be installed between the piping and the furnace wall?
Using a polynomial equation solver, determine the steady-state surface temperature (Ts) of the passive radiative cooler below that is exposed to a windy convective enviroment h=40 W/m2*K and T∞= 25°C. The surrounding atmosphere is fixed at Tsur= 10°C. Set up the energy balance/conservation equation.
MATLAB PROBLEM
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Ammonia is to be removed from a 10 per cent ammonia-air mixture by countercurrent scrubbing with water in a packed tower at 293 K so that 99 per cent of the ammonia is removed when working at a total pressure of 101.3 kN/m². If the gas rate is 0.95 kg/m?s 155 of tower cross-section and the liquid rate is 0.65 kg/m²s, what is the necessary height of the tower if the absorption coefficient Kga = 0.001 kmol/m³s (kN/m²) partial pressure difference. The equilibrium data are: Concentration (kmol NH3/kmol water) Partial pressure NH3 (kN/m²) 0.021 0.031 0.042 0.053 0.079 0.106 0.150 1.6 2.4 3.3 4.2 6.7 9.3 15.2
A solar dish with a concentration ratio of 80 means O a. solar irradiance is multipled 80 times O b. solar power is multiplied 80 times O C. temperature is multiplied 80 times O d. reflector diameter is multiplied 80 times
If the surface temperature of the inside wall of space is higher than the dew- point temperature of the air; evaporation will take place O condensation will take place O evaporation will not take place O condensation will not take place

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ugh its interior. A radiation shieldi nd the tube, providing an air gap reen the tube and the shield, and reac