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Figure 31. Horsepower versus AT for centrifugal compressors.

examined. This analysis involves Table 6 as well as the steam and MVR evaporator schematics shown in Figures 28a and 29b.

The first two columns of Table 6 give the properties of saturated water vapor 14.7 psia, 212°F and at 17.2 psia,

220°F. These values can be used to estimate the energy requirements for an evaporator operating at these conditions.

Looking first at the steam evaporator shown in Figure 29a, water at 17.2 psia, 220°F has an enthalpy (heat con-

1 23456789 10 11 Horsepower per 1000 Ib/h flow

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1 23456789 10 11 Horsepower per 1000 Ib/h flow

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