If, for the conditions of Problem 15.29, ho in Btu/h ft F varies according to ho 0:575/D1/4 o, where Do is the outside diameter of the insulation in feet, determine the thickness of insulation that...

If, for the conditions of Problem 15.29, ho in Btu/h ft
F varies according to h_o

0:575/D^1/4
_o, where D_o
is the outside diameter of the insulation in feet, determine the thickness of insulation that will reduce the heat flux to one half that of the value for the bare pipe.