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Two parallel rectangles having emissivities of 0.6 and 0.9 are each 1.2 meters wide and 2.4 meters...

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Mechanical Engineering

Two parallel rectangles having emissivities of 0.6 and 0.9 areeach 1.2 meters wide and 2.4
meters high. They are positioned 0.6 meters apart. The plate with ?= 0.6 is at 1000 K while the other is
420 K. The surroundings are at 290 K and may be assumed to absorball energy that escapes the two plates.
(a) What is the total energy lost (Watts) from the hotter plate(radiosity)?
(b) What is the radiant energy exchange (Watts) between the twoplates?

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