4. Two coaxial cylinders, r. = 3.5 cm, r2 = 8 cm, of equal length (3.5 m) are placed inside a very large room maintained at 350 K. Suppose that the inside cylinder is maintained at 520 K, outside at...

Two coaxial cylinders, r₁
= 3.5 cm, r₂
= 8cm, of equal length (3.5 m) are placed inside a very large room maintined at 350 K. Suppose that the inside cylinder is maintained at 520 K, outside at 636K, determine the net heat transfer at surface 2 when the emissivities are ε₁=0.37 and ε₂=0.56.

Extracted text: 4. Two coaxial cylinders, r. = 3.5 cm, r2 = 8 cm, of equal length (3.5 m) are placed inside a very large room maintained at 350 K. Suppose that the inside cylinder is maintained at 520 K, outside at 636 K, determine the net heat transfer at surface 2 when the emissivities are ɛ, = 0.37 and ɛ2 = 0.56.