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Message: [QUOTE="old#48, post: 371380, member: 32272"] I have now been reminded that convection (not just conduction) plays a huge part in cooling system heat transfer. It all gets very, very complicated - beyond me - I mean this stuff gets way out there in "la la" land. As added support for the ethylene glycol having better overall (conduction AND convection wise) heat transfer characteristics than propylene glycol, I quote the following from a Dow Chemical Engineering and Operating Guide for [U]propylene[/U] glycol: [I]For applications where there is no chance of accidental contact with food or beverage products, and where there is no possibility of incidental contact with drinkiing water, DOWTHERM [B]ethylene[/B] glycol based fluids are generally used because of their greater heat transfer efficiency and superior low temperature performance. Ethylene glycol based fluids are less viscous than propylene glycol based fluids. Therefore, they generally provide superior heat transfer efficiency and better low temperature performance and are preferred for most heat transfer applications. However, in applications where toxicity is a concern, propylene glycol fluids are used because of their low acute oral toxicity vs. the moderate? toxicity of ethylene glycol.[/I] I'd say it's probably getting close to time to quit on this thing - I think we (especially me) have pretty much beat this subject to death. I think I'll get some post-tramatic-stress-syndrome counseling and just stay away from these technical debates. :whiner: [/QUOTE]

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