If a third rectangular plate, with both surfaces having an emissivity of 0.8 is placed between the..

If a third rectangular plate, with both
surfaces having an emissivity of 0.8 is placed between the two plates described
in Problem 23.31, how will the answer to part (a) of Problem 23.31 be affected?
Draw the thermal circuit for this case.

Problem 23.31

Two parallel rectangles have emissivities
of 0.6 and 0.9, respectively. These rectangles are 1.2 m wide and 2.4 m high
and are 0.6 m apart. The plate having  is maintained at
1000 K and the other is at 420 K. The surroundings may be considered to absorb
all energy that escapes the two-plate system. Determine

a. the total energy
»

If a third rectangular plate, with both
surfaces having an emissivity of 0.8 is placed between the two plates described
in Problem 23.31, how will the answer to part (a) of Problem 23.31 be affected?
Draw the thermal circuit for this case.

Problem 23.31

Two parallel rectangles have emissivities
of 0.6 and 0.9, respectively. These rectangles are 1.2 m wide and 2.4 m high
and are 0.6 m apart. The plate having  is maintained at
1000 K and the other is at 420 K. The surroundings may be considered to absorb
all energy that escapes the two-plate system. Determine

a. the total energy lost from the hot
plate;

b. the radiant energy interchange between
the two plates.

»

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