Determine the net rate of radiation heat transfer between the surfaces, and between surface (2) and the surrounding. For surface (1): Width= 0.8 m Emissivity=0.75 T=400 K Surface (1) and surface (2) are perpendicular to each other, and the common edge between them is 1.6 m long. For surface (2): Height= 1.2 m It is a black body T2= 550 K For the surrounding: T= 290 K Emissivity= 0.85 A (2) A (1)