A horizontal pipe having a surface temperature of 67C and diameter of 25 cm is buried at

Question:

A horizontal pipe having a surface temperature of 67ºC and diameter of 25 cm is buried at a depth of 1.2 m in the earth at a location where k = 1.8W/m ∙ ºC. The earth surface temperature is 15ºC. Calculate the heat lost by the pipe per unit length.