Implementing Black Hole as Efficient Power Plant *

Shao-Wen Wei,Yu-Xiao Liu

Fig. 4 (Color online) Rankine cycle with $\tilde{T}_{2}=0.1$. The reduced work and heat for the engine are plotted in thin solid blue line and thin dashed blue line (left $y$-axis), respectively. The engine efficiency is plotted in thick solid red lines (right $y$-axis) for $\tilde{T}_{E}=1.1$, 1.2, and 1.5 from bottom to top.