Re: Iam looking for an argument
The trouble with parallel circuits is that the water will always pass through the closest to the exit circuit or the easiest circuit to traverse. This can lead to blockages in some areas as small particles can start large blockages which only get bigger. That would only be a problem with coolant with particles suspended in it.
The speed at which the water travels will be on average 1/3 of the velocity of this series circuit when ignoring frictional and pressure drops. Hence the volume will need to be increased,but not by a factor of three maybe two would be sufficient. The speed has to be kept up to reduce or eliminate lamina flow, that is awkward in this case as there seems to be rectangular passages and the corners are a problem.
Turbulent flow is a must or the sluggish lamina flow layer will act as an insulator.