A surface is exposed to solar radiation. The direct and diffuse components of solar radiation are 480 and 250 W/m2, and the direct radiation makes a 35º angle with the normal of the surface. The solar absorptivity and the emissivity of the surface are 0.24 and 0.41, respectively. If the surface is observed to be at 315 K and the effective sky temperature is 256 K, the net rate of radiation heat transfer to the surface is
(a) -79 W/m2
(b) -22 W/m2
(c) 25 W/m2
(d) 154 W/m2
(e) 643 W/m2
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