"lack of smoothness has to result in increased friction leading to a substantial increase in resistance to fluid flow. hence less flow per unit time, hence less heat exchange per unit time, hence less cooling per unit time."
I have to say I see your point but when I go to the calculation table supplied by the manufacturer and the table for std tubing .... they are using the same GPM, BTU per hour and Velocity for the end result of delivering a product ... so maybe there is no resistance or slow down of the fluid at the end ?? it was only a thought ... as per what was originally spec steel pipe ... it was probably the best choice...because with the correct anitfreeze with the correct anit corrosion properties ..those tubes would last in excess on 30 years ...hey they did already. LOL
Ron
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