Steady Under Pressure: Distillation Pressure Control - Method 20

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Method 20: 3E :  Control condenser inlet coolant temperature. 'Tempered water.'

Method: Vary heat flux. Vary utility supply temperature.
Process: Net vapor rate zero.
Advantages: Cooling stream leaves unit at maximum temperature. Condenser film temperatures at maximum.
Disadvantages: Local pump required. Response may be slow due to system liquid inventory.
Application: Used for heat recovery to liquid streams from condenser. Condenser coolant always runs at maximum temperature consistent with duty removal. This can be useful to prevent localized solidification in some processes.
Variants: Pump may be installed at exchanger outlet.
Configuration notes: When used with cooling water often referred to as a 'tempered water' system.
Operation: Variable recycle changes temperature of cooling stream. This, in turn, changes the exchanger LMTD.

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This page updated 03 April 2000.
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