David Roberson <[email protected]> wrote:
> Do you have information about where the ambient temperature was during > this long time period? For the entire 28 hours it is: Average 16.67°C, min 15.93°C, max 17.30°C The difference between the ambient and water settles to a much larger value than it did in the past. It is 1.39°C in this case. I think this changed after he put the tent over the experiment. It must have been in a pocket of warm air or something like that. He installed fans to make the air temperature more homogeneous. The temperature swings are much smaller than before, because of the tent. > I have an extremely accurate measurement of the thermal resistance from > the data you supplied which is .67 degrees C per Watt. That is what I got previously but I think it is changed. Or I guess I should say, I do not think the ambient temperature measurement is trustworthy to within a half-degree. After a lot of frustration, I decided to stop trying to derive the pump heat from on the basis of the difference between the water and air temperatures. I'm going to wait for additional calibration data and try and get it from that. - Jed
