These core volume relationships are very empirical. The numbers refer to just the core of the heat exchanger (fins and all) but exclude the inlet and outlet tanks. As I noted in the relationship ratio, there is an allowance made for the different efficiency of horizontal crossflow designs as opposed to the vertical type. These are first order fits to the properties of hundreds of different systems and are used for the initial setup. If inadequate (because of available surface area or volume) then experiments follow. Frank Grunthaner |
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