The heat pipe contains a small amount of water at a pressure of 200 kPa that experiences nucleate boiling as solar radiation is incident on the outside surface of the copper tube at a rate of 745 W/m2. You may assume that the glass is transparent to solar radiation and that the absorptivity of the copper tube with respect to solar radiation is 1.0. The surface of the copper tube has an emissivity of 0.13 with respect to its radiative interaction with the inner surface of the glass tube. The glass may be assumed to be opaque to thermal radiation from the copper tube with an emissivity of 1.0 on both its inner and outer surfaces.
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