In orange-growing areas, the freezing of the oranges on the trees during cold nights is economically important. If the oranges are initially at a temperature of 21.1°C, calculate the center temperature of the orange if exposed to air at –3.9°C for 6 h. The oranges are 102 mm in diameter and the convective coefficient is estimated as 11.4 W/m2-K. The thermal conductivity k is 0.431 W/m-K and α is 4.65 × 10–4 m2/h. Neglect any latent heat effects

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