Implementing Black Hole as Efficient Power Plant *

Shao-Wen Wei,Yu-Xiao Liu

Fig. 1 (Color online) Phase diagram in the reduced $\tilde{T}$-$\tilde{S}$ chart. The red thick line denotes the coexistence curve. Below the curve is the region of coexistence phase of small and large black holes. Left and right regions above the curve are the small and large black hole phases, respectively. Here we call the left part and right part of the coexistence curve as the saturated small and large black hole curves, respectively.