$10m10m$

flat plate

$(1)30C,{}_1=0\mathrm{.}6,300K$

$(2)20C,{}_2=0\mathrm{.}7,293K$

$A_1=A_2$

Twall $=?$

$F_{1}2=0\mathrm{.}42($fram book$)$

$F_{\frac{1}{11}}+F_{1-2}+F_{13}=1$

$F_{13}=0\mathrm{.}58$

$Q_{12}=A_1(F_{12})Gdarr(T_1^4-T_2^4)=3482kW$

$1010$