Rectangular tubes vs circular tubes for condenser

[Boogerlad]

Hi, I'm wondering if circular tubes are used for condensers only because of how common it is. It would be very expensive to manufacture a condenser with rectangular tubes because they simply do not exist according to my googling. Theoretically though, would rectangular tubes be more optimal? It is for water cooling, according to a sticky: http://www.xtremesystems.org/forums/...read.php?54331

[[XC] Lead Head]

You often see flattened tubes in automotive applications, but not very often in traditional HVAC applications. Not sure why. Must not be worth the added cost.