Inner room temperature is $20$C and outer room temperature is $-6$ C heat convection coefficient between Inner side and inner surface is $8$ w$/$mK and outer side and outer surface is $23$ w$/$mK

A$)$ Find heat transfer for surface area of $25$ m$^2$ and find total heat transfer coefficient.

B$)$ find the thickness of the insulation with heat conduction coefficient of $0\mathrm{.}04$ to decrease heat transfer of $60$ percentage

C$)$ Calculate Inner and outer surface temperature of he will with insulation

D$)$ Calculate the Highest temperature through the Wall.

K$1=0\mathrm{.}87$ w$/$mK

K$2=0\mathrm{.}52$ w$/$mK

K$3=0\mathrm{.}87$ w$/$mK

kms$=0\mathrm{.}04$ w$/$mK

L$1=0\mathrm{.}03$m

L$2=0\mathrm{.}19$m

L$3=0\mathrm{.}04$m