VI$\mathrm{.}2$ A coolant is transported in a pipe with external wall temperature of $-30\backslash$deg C and with outer diameter of $10$ cm$.$ The tube is thermally isolated by two layers: $1)$ an internal layer of foamed polypropylene with thermal conductivity of $0\mathrm{.}08$ W$.$m$-1.$K$-1$ and thickness of $10$ cm$,$ and $2)$ an external felt layer with thermal conductivity of $0\mathrm{.}05$ W$.$m$-1.$K$-1$ and thickness of $5$ cm$.$ Temperature of the outer surface is $25\backslash$deg C$.$ Calculate the heat flow from the surroundings to the tube with length of $100$ m$.$ What is the temperature on the boundary between polypropylene and felt layers?

Result: The heat flow from the surroundings is approx. $1\mathrm{.}77$ kW$.$ Temperature between layers of isolation is $8\mathrm{.}8\backslash$deg C$.$Kiindly show me clear staffs on how to solve this as I dont understand heat transfer. Also draw some rough sketches represnting the questionsVI. $2$ A coolant is transported in a pipe with external wall temperature of $-30C$ and with outer

diameter of $10cm.$ The tube is thermally isolated by two layers: $1)$ an internal layer of

foamed polypropylene with thermal conductivity of $0\mathrm{.}08W*m^{-1}*K^{-1}$ and thickness of $10cm,$

and $2)$ an external felt layer with thermal conductivity of $0\mathrm{.}05W*m^{-1}*K^{-1}$ and thickness of $5$

$cm.$ Temperature of the outer surface is $25C.$ Calculate the heat flow from the

surroundings to the tube with length of $100m.$ What is the temperature on the boundary

between polypropylene and felt layers?

Result: The heat flow from the surroundings is approx. $1\mathrm{.}77kW.$ Temperature between

layers of isolation is $8\mathrm{.}8C.$