A solar collector arrays has been installed on a roof of a residential home. Each panel can be assumed to flat and has a surface area of approximately 2.5 m2 . The panel is relatively thin (0.7 cm) and has a reported thermal conductivity of 0.65 W/m C. The vendor documentation claims that both convection and radiation modes of heat transfer will contribute to rejected heat from the surface of the panel. Convection heat loss can be assumed to occur under natural conditions. If temperature of the inner and outer surfaces of the panel has been estimated to be 27 C and 24 C, set up the energy bal calculated the heat lost from the panel attributed to radiation heat transfer on an average spring day.