Heat & Mass Transfer Incropera 6th ed prob. 5.68: Asphalt pavement may achieve temperatures as high as 50 degree celcius on a hot summer day. Assume that such a temperature exists throughout the pavement, when suddenly a rainstorm reduces the surface temperature to 20 degree celcius. Calculate the total amount of energy(J/m^2) that will be transferred from an asphalt over a 30-min period in which the surface is maintained at 20 degree celcius.