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myv65 · 08-01-2002, 11:21 AM

BigBen,

I don't want to put a damper on your quest, but when I see stuff like "200 gph+", I gotta comment. You've already been through the exercise of water's thermal properties. You know that flow rate * delta-T equals power. Taking the relevant units, watts = gph * °C / 0.227 or gph = watts * 0.227 / °C.

This means 100 watts causes a delta-T of 1°C at 22.7 gph. At your "200 gph+", say 227 gph, delta-T for 100 watts is only 0.1°C. This 0.9°C improvement for a 900% flow rate increase is pretty pathetic.

Granted, what matters isn't delta-T in the water but rather delta-T between the die and the water. This still isn't so much a function of volumetric flow rate, though, as it is velocity and surface area.

I realize I'm not telling you anything you don't already know, but it seems you may be straying a little. Just remember, it's all about balancing the entire system and the block is just one part. You could have "the world's best block" and still have a lousy system if the remaining components aren't right for that block.

08-01-2002, 11:21 AM	#58
myv65 Cooling Savant Join Date: May 2002 Location: home Posts: 365	BigBen, I don't want to put a damper on your quest, but when I see stuff like "200 gph+", I gotta comment. You've already been through the exercise of water's thermal properties. You know that flow rate * delta-T equals power. Taking the relevant units, watts = gph * °C / 0.227 or gph = watts * 0.227 / °C. This means 100 watts causes a delta-T of 1°C at 22.7 gph. At your "200 gph+", say 227 gph, delta-T for 100 watts is only 0.1°C. This 0.9°C improvement for a 900% flow rate increase is pretty pathetic. Granted, what matters isn't delta-T in the water but rather delta-T between the die and the water. This still isn't so much a function of volumetric flow rate, though, as it is velocity and surface area. I realize I'm not telling you anything you don't already know, but it seems you may be straying a little. Just remember, it's all about balancing the entire system and the block is just one part. You could have "the world's best block" and still have a lousy system if the remaining components aren't right for that block.