# 1. A flat metal plate (e = 0.66, and a = 0.35) is exposed to solar radiation, at an irradiation rate

1. A flat metal plate (_ = 0.66, and _ = 0.35) is

exposed to solar radiation, at an irradiation rate of 1000 W/m2.

Find the plate temperature after a long time exposure (i.e., steady state

condition). The convection heat transfer coefficient is estimated at about 20

W/m2 ·K.

2. A disk, having a diameter of 1 m, is parallel to and on

the centerline of another disk, having a diameter of 1.2 m. The two disks are 1

m apart. Find F12 and F21.