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Originally posted by deeppow
Actually I don't think I misunderstood.
The water can't be cooler than the air unless we're using phase change or refrigeration of some type, e.g. evaporative cooling of the air going into the rad.
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True.
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Thus the temp of the water at the entrance of the water block will be at room temp at best unless other mechanisms are used.
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Yes, and will probably be somewhere around 25-35 C.
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This does raise an interesting thought. This line of thought says one of the problems in testing required of BillA, or whomever, is the accuracy for temperature measurements in this situation.
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Yes. Temperature measurements on the range of 0.1 C are going to be pressing the limit for accuracy for the fairly inexpensive type of temperature probe (thermocouple) It is quite likely a better thermal sensor like an RTD will only serve to pick up more noise and random fluxuations in temperature.
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Measurement of the energy transferred from, and to, the fluid is really not possible via the fluid temp, or extremely difficult at best. What about a simulant fluid with less heat capacity so temperature can be better used? This is done all the time in many experimental applications and must have been thought of here.
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Unless you know of a fluid with the exact same density, heat capacity, viscosity, thermal condution coefficient, etc., we'd need to make a host of correlations to compare the data between the two and introduce a lot of unnecessary inaccuracy and work.
Alchemy