A compact heat exchanger has been defined as anything over a few hundred square meters of surface area per cubic meter of volume.
Since other factors such a turbulence, conductivity, etc. are also important in heat transfer wouldn't a more direct measure, something like watts per cubic meter per degree C, be more useful?
Bret Cahill
Dear BretCahill:
I'd think "compact" simply means physically small. Selection of the heat exchanger doesn't rely on the wording, but on the necessary performance
*and* the space available.David A. Smith
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