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Originally Posted by bigben2k
That makes the heat source repeatable; it does not measure the actual wattage.
Do you know the temp difference that you're proposing to measure? (i.e. radiator output)? You also need to have a precise measurement of the airflow, if you're going to measure a dT air-in to air-out. Both measurements at 1% accuracy or better.
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Ok, then better than radiator, use a TEC chiller, and calculate power output based on the variables you have:
Internal loop temp
External loop temp
TEC current
TECs have a firm relationship between applied current and moved heat. I don't have equations, but they are available.