You need to start by making the following statement be set in stone:
"All temperature readings reported are under steady-state conditions"
This is a requirement!
Now, how can one arrive at steady-state? Over the length of the data collection then water, air, and die temperatures cannot change appreciably. Not so hard for one point on a C/W vs GPM curve; can get to be a big pita for 5-6 over several hours.
You have the cart before the horse though. The first step is to set a water temperature. Everyone will need to use the same one, you realize (right?). Assuming your die simuator is perfectly insulated (heh) then I don't think room temperature directly affects the results. The difference between room and water temperature though could have an effect on the observed delta T. Can the equipment being used pick this up? Not sure.
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