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Incoherent · 12-14-2003, 02:44 AM

I am very close to gaining a stupid point.
The chart above showing secondary losses is reliant on the measured W tracking water temperature. I established the 100% level by plotting all W measurements vs water temp and finding the linear which fit. This curve I used to recalculate W adjusted for water temperature.
The problem is that I do not have enough data. I need many more measurements at fairly constant power levels but varying water temperatures. Essentially I think it is mostly luck that the trend I used agrees fairly well with what I believe will happen. Which is bloody dangerous. It is too easy to make the experiment results match expectations.
Consider the above chart a picture of the tendency, but be suspicious of the absolute Efficiency number. That said, I am in the process of looking at this from the bottom up by isolating temperatures, it is in reasonable agreement, losses are possibly a bit less. (the mental contortions this approach requires are painful). Ballpark.
Another chart of the same data, this time relative to absolute CPU temp.

Oh, Les. Yes, I'm trying to extract the MB losses. I don't think the flux block loses too much. Other issues instead as touched on earlier (heat flux uniformity etc)

Cheers

Incoherent

12-14-2003, 02:44 AM	#92
Incoherent Cooling Savant Join Date: Sep 2003 Location: Vallentuna, Sweden Posts: 410	I am very close to gaining a stupid point. The chart above showing secondary losses is reliant on the measured W tracking water temperature. I established the 100% level by plotting all W measurements vs water temp and finding the linear which fit. This curve I used to recalculate W adjusted for water temperature. The problem is that I do not have enough data. I need many more measurements at fairly constant power levels but varying water temperatures. Essentially I think it is mostly luck that the trend I used agrees fairly well with what I believe will happen. Which is bloody dangerous. It is too easy to make the experiment results match expectations. Consider the above chart a picture of the tendency, but be suspicious of the absolute Efficiency number. That said, I am in the process of looking at this from the bottom up by isolating temperatures, it is in reasonable agreement, losses are possibly a bit less. (the mental contortions this approach requires are painful). Ballpark. Another chart of the same data, this time relative to absolute CPU temp. Oh, Les. Yes, I'm trying to extract the MB losses. I don't think the flux block loses too much. Other issues instead as touched on earlier (heat flux uniformity etc) Cheers Incoherent Last edited by Incoherent; 12-14-2003 at 02:51 AM.