Two-stage power recovery expander

Figure 4-101. Elliott two-stage power recovery expander.

Figure 4-106. Net incremental cash flow for one- and two-stage power recovery expander schemes.

The electric power usage is the primary expense incurred when using a motor driver. Table 4-10 documents these findings and the net incremental cash flow using one- and two-stage power recovery expanders is shown in Figure 4-108. 

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