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Originally Posted by bigben2k
Temp measurements of air may be tricker, because the difference (air in vs air out) may be very, very difficult to measure, especially under high airflow rates.
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Not so sure about that one - you need roughly 3,500 times the volume of air as of water to get the same temperature change @ 300K. I would personally suspect (not having tried it with water) that it would be easier to duct fairly cold air over the rad to control the outlet water temperatures at lowish velocities. This would give you a reasonably large delta T to measure as well as making the flow rate easier to measure (there are plenty of air flow measurers out there for sailing and the like, but even if you use a simple pitot-static arrangement it's pretty easy to do).
Remember if you're testing water blocks then getting the peak performance from the radiator isn't all that important - you really only have to be able to attain a consistent block inlet temperature/pressure drop across block. Aside from that the block doesn't know or care about airflow over the rad.