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Originally Posted by unregistered
...in any case an environmental chamber will be found essential, as will the ACCURATE characterization of the fan inlet air temp (not the same as ambient by any stretch of one's imagination)
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Indeed a well controlled air temperature is essential.
However I believe this method does not need air inlet temperature or ambient - except to check the method result and it is essential that they are constant.
I have made some measurements and calculations:
The lack of air temperature control is visible here as a deviation from the ideal curve. This will be throwing the reading but I am now pretty certain this is a valid method.
Important to note that this is the System heat dissipation C/W, not just the Radiator.