[greenman100]

cross flow=singlepass rad, ok 90 degree angles, then?
parallel flow= what do you mean here, flow of liquid and gas in same direction?
Counter flow='Making sure this occurs in a rad requires that the liquid in the tubes moves through the coil in the opposite direction (counter flow) to how the gas, on the fin side, moves through the rad. This even applies to chambered cores but to a much smaller extent as cores are a much smaller system and the difference is very small ."so opposite direction is key here, got it, if I understand you correctly


going to google now

pieces are coming together


Well, it seems to me counter flow is best because it maintains the greatest deltaT

crossflow is second best because some of the rad has a high delta T, some has low

parallel means there is no deltaT by the end of the rad


dunno if I explained that very well, but crossflow does seem mose efficent, if I am understanding correctly