Question

Asphalt pavement may achieve temperatures as high as 50^oC on a hot summer day. Assume that such a temperature exists throughout the pavement, when suddenly a rainstorm reduces the surface temperature to 20^oC. Calculate the magnitude of total amount of energy (kJ/m²) that will be transferred from the asphalt over a 30-min period in which the surface is maintained at 20^oC. Consider density of asphalt as 2135 kg/m³ and thermal conductivity as 0.054000000000000006 W/mK. The specific heat capacity of asphalt is 920 J/kgK.

Energy = 467 kJ/m²

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