Method: Vary vaporizing area (coolant side).
Process: Net vapor rate zero. Heat recovery into vaporizing utility stream.
Advantages: Less equipment required than Method 19.
Disadvantages: Difficult to add blow-down on vaporizing coolant.
Application: Used with heat recovery by having condenser reboil another tower or vaporize a utility stream (water to steam).
Variants: The pressure controller may directly control the utility flow without a reset to the utility level.
Configuration notes: Most common in cryogenic plants.
Operation: Control valve varies level of vaporizing stream on utility side of condenser.
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