Barometric Legs and Hotwells

MINIMUM HEIGHT EQUAL T0N.7 PSI AT IOTTOM of LIQUID COLUMN IMUST TAKE INTO ACCOUNT THE FOiSIIILITT OF A LIQHT LIQUID FLOATING IN STAND LEG) 

I) WILL NEED TO BE ABLE TO INITIALLY PROVIDE LIQUID UVEL M VESSEL 1) I LEG PER JET STAGE REQUIRED. 

Usually an ejector is designed for maximum efficiency at one operating condition. The quantitative performance characteristics of an ejector at conditions other than design cannot be accurately predicted. They must be determined by testing. 

Ejector design may be either critical or noncritical. Critical design means that the vapor velocity in the diffuser is sonic and occurs at compression ratios above 1.8. In noncritical designs the vapor velocity in the diffuser is subsonic. 

Effect of Operational Changes on Critical Flow Ejector Performance 

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Handbook of Evaporation Technology Barometric Legs and Hotwells... 

If sufficient height is not available for a barometric leg, condensate may be collected in a small accumulator tank, the liquid level controlled, and condensate removed from the tank with a centrifugal pump. Such systems are called "low-level" hotwells and are illustrated in Figure 23-6. Each intercondenser must have its own accumulator, pump, and level control. Because this is costly, most jet systems are located high in the structure and use the barometric leg and hotwell system. 

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