Solution: (2)
$
\begin{array}{l}
\operatorname{cop}=\frac{\mathrm{q}_{1}}{w}=\frac{\mathrm{q}_{2}}{\mathrm{q}_{1}-\mathrm{q}_{2}}=\frac{\mathrm{T}_{\mathrm{c}}}{\mathrm{T}_{\mathrm{H}}-\mathrm{T}_{\mathrm{C}}}=5 \\
\mathrm{~T}_{\mathrm{C}}=5 \mathrm{~T}_{\mathrm{H}}-5 \mathrm{~T}_{\mathrm{c}} \\
6 \mathrm{~T}_{\mathrm{c}}=5 \mathrm{~T}_{\mathrm{H}} \\
\mathrm{T}_{\mathrm{H}}=\frac{6}{5} \times 253 \mathrm{k}=303.6 \mathrm{k}=30.6^{\circ} \mathrm{C}=31^{\circ} \mathrm{C}
\end{array}
$