Here is a paper I have been meaning to upload for a long time. I kept forgetting to do that. Anyway here it is now:
Pons, S. and M. Fleischmann, Calorimetric measurements of the palladium/deuterium system: fact and fiction. Fusion Technol., 1990. 17: p. 669.
https://lenr-canr.org/acrobat/PonsScalorimetra.pdf
There is a graph in this paper which is sort of famous. It shows a large heat burst. I believe I've seen it reproduced on a T-shirt. Here it is:
I do not understand what the y-axis of this graph shows. I would appreciate it if someone would explain it.
The y-axis is the log of 100 times "enthalpy generation / joule enthalpy input." That does not seem to correlate with anything in Table 1. And why is it "Joule" enthalpy input and not "Watt"? At peak, it is 100 * 3 = 300 times . . . what?And what does "enthalpy generation" mean, anyway? Is that excess heat? (~10 W just after 1.6 million seconds.) Or is it input power plus excess heat? (~17 W just after 1.6 million seconds, I think.) Why is it multiplied by 100?? I am confused!
Let me go back to the beginning.
The paper says: "The cumulative excess enthalpy for the bursts shown in Figs. 5a, 5b, and 5c = ~16 MJ/cm^3 far exceeds the heat that could be generated by any conceivable chemical process (factor of 10^2 to 10^3)."
Here is the previous graph, 5a, which I do understand:
The top graph shows the temperature. This corresponds to output power, but not in a linear fashion because the temperature goes up to 47°C which means power goes up significantly more because of the Stefan-Boltzmann law. The caption says the cathode is a rod, 0.4 x 1.25 cm. That is 0.63 cm^3. The text says total enthalpy from this graph is 16 MJ per cubic centimeter, so that comes to 10 MJ absolute value.
The experiment lasts ~7 million seconds, so that is ~1.4 W average. But, as you see, most of the time it is quiescent. Most of the enthalpy is generated in the first burst, which lasts from 1.6 to 3.2 seconds, a duration of 1.6 million seconds, or 18.5 days. 10 MJ/1.6 million seconds = 6 W. Most of the enthalpy is generated between 1.6 and 2.4 million seconds = 0.8 million seconds, so I guess that is ~10 W.
The graph below this, Fig. 5c, shows total specific excess energy. Which is 16 MJ as noted. "Specific" means per cubic centimeter. And, as I just said, most of the energy is generated soon after the 1.6 million second mark.
Getting back to figure 5b, the one I do not understand, the curve from 1.6 to 3.2 million seconds is level compared to the temperature (Fig. 5a) or specific excess energy (Fig. 5c) curves, because this is a log scale graph.
But what exactly does the y-axis show?