The thermal problem in a condenser is broadly the same everywhere: remove latent heat, get the condensate out, and deal with whatever noncondensable gas arrives with the vapor. What changes from one industry to the next is the constraint wrapped around that problem — a hygiene standard, a documentation package, a vacuum that must be held, or a reflux ratio that sets product purity. These four sections group the duties by that constraint rather than by exchanger type.
Choosing a condenser is mostly a sequence of trade-offs, and the order you make them in matters. Which side the vapor condenses on decides how much pressure drop you can afford and how easily the fouling surface can be cleaned. Whether the bundle has to come out decides the TEMA configuration. How much noncondensable gas arrives decides how much surface you actually need, which is often considerably more than a clean-vapor calculation suggests.
The condensate chemistry — not the bulk vapor chemistry — should drive material selection, because the first liquid to condense concentrates whatever acid or chloride is present into a very small volume. That film is what attacks the tube wall, and it is why a stream that looks benign on a bulk analysis can still need duplex, titanium or a nickel alloy.
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