our difference lies with the definition of "a minimum flow rate"
had you said 1.5gpm I'd not have even posted
but 0.3 to 0.4 is far below what can be useful
but looking at your system description it is very clear why you see no benefit from higher flow rates:
you cannot achieve them
your 'chiller' is killing your flow (potential), and also any cooling benefit as the chiller 'can't cope'
-> chillers ONLY 'work' (and I misuse the word here) at very low flow rates
because their capacity is so limited
just saw your note
NB wb in series or parallel ?
(I would suspect this as a contributing factor)
and either way confuses the issue: in parallel diverts some of the flow, in series severely limits it
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