0.05:= r 2

0.025=:=A 4 pi r2 7.854 10 3=:=

h 15:= 0.8:= Tp 70 273.15+ 343.15=:=

Tinf 20 273.15+ 293.15=:= 5.67 10 8:=

Qh h A Tp Tinf( ) 5.89=:= W

Q A Tp4 Tinf 4( ) 2.309=:= WQt Qh Q+ 8.199=:= W