Question 84: Thermodynamics & KTG

Question

If sink is at a temperature of $$-39\Upsilon$$C and source at 0$$^\circ$$C, then efficiency will be

Accepted Answer

Given, temperature of sink,
$$\begin{aligned}
T_2 & =-39^{\circ} \mathrm{C} \
& =(273-39) \mathrm{K} \
& =234 \mathrm{~K}
\end{aligned}$$
Temperature of source,
$$\begin{aligned}
T_1 & =0^{\circ} \mathrm{C} \
& =(273+0) \mathrm{K} \
& =273 \mathrm{~K}
\end{aligned}$$
$$	herefore$$  Efficiency,
$$\begin{aligned}
\eta & =1-\frac{T_2}{T_1} \
& =1-\frac{234}{273} \
& =\frac{39}{273} \
& =0.142 \
& =14.2 \%
\end{aligned}$$

Answer

39.4%

Answer

14.2%

Answer

35.2%

Answer

45.5%

Thermodynamics & KTG

If sink is at a temperature of $-39\UpsilonC and source at 0^\circ$C, then efficiency will be

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