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qrad = hr (Ts - Tsur) hr: Radiation heat transfer coefficient (W/m K) hr = (Ts + Tsur) (T + Tsur) For combined convection

qrad = hr (Ts - Tsur) hr: Radiation heat transfer coefficient (W/m K) hr = (Ts + Tsur) (T + Tsur) For combined convection and radiation, - q" = conv+qrad = h(Ts T) + hr (Ts - Tsur)

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