# T, = 700K E 0.8 RI T, =900K 2 R2 E20.5 3. Two gray-diffuse spheres have...

###### Question:

T, = 700K E 0.8 RI T, =900K 2 R2 E20.5
3. Two gray-diffuse spheres have properties and temperatures shown below. R and R2 are 0.1 m and 0.3 m respectively. (i) Compute heat transfer rate of sphere 1, q W]. Also, to minimize the heat loss, you decide to put a radiation shield in between the two spheres. (ii) Where do you prefer to place the radiation shield, i.e., close to sphere 1 or sphere 2 or right in the middle? (ii) Somehow you place the radiation shield with R3 = 0.2, E3 = 0.1. What is the temperature of the shield? (iv) compare the heat transfer rate with and without the radiation shield. The Stefan-Boltzmann constant is 5.67 x 10-8 W/m2-K4 (40 pt)

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