Very very similar Les.
Which is excellent. I am very pleased to see that you have been taking similar approaches, it makes me think I might not just be making this up.
(it also confirms my chronic affinity for wheel re-invention)
Quote:
Originally posted by pHaestus
setup WILL be replumbed and lab chiller will be used to control wb inlet temperatures as soon as it gets here.
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Fantastic, that will be massively interesting data when looked at relative to what you have produced already. I am looking forward to it.
Quote:
Originally posted by unregistered
reasonable, but - as always - the question is "W"
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I've looked at some of the data I've been collecting, and produced this chart:
I am perplexed. Very noisy data, but the trend is clear and with over 500 data points the statistical probability that the trend line is correct is very high. This says that my diode error is 0.0336°C, which I can not believe, I was estimating about 5°C too low. I am a little confused, the only possible answers I can see are either that four separate thermometers (water, T1,T2,Ref) have a linearity/compression problem or the measurement noise is too excessive. probably the latter, standard deviation is 4.3°C. But there is some very interesting behaviour in the W normalised to water T. I need to look at this closely and have a bit of a think.
If this is correct, the chart also suggests a C/W of 0.509 for the water/WB/TIM/measuring block/TIM/silicon/diode heatpath. It might be possible, assuming the measurement noise is mostly secondary path losses, to put a figure on it (the loss) and hence get a fairly good figure for "W"
Great, if my diode reading is correct (which obviously it is) then my latest waterblock is blowing the Cascade out of the water performance-wise at 0.07C/W </OPTIMISM></IRONY>
Cheers
Incoherent