The temperatures and power out had a nice run up today for almost the last 24 hours.
And the temps all rose, albeit, slightly. About 12:20, after struggling to determine a valid comparison, we upped the power to 48.8 watts. Then we dropped it back to 48.2 a little later to be closer to our target and other calibration points.
Our first suspect was that the Ambient might be changing. It was nice and steady as long as the rise was. When it rose at the end, it made the P_xs get all choppy and appear to drop. We're only talking about 0.4C range, though. And notice that little 0.25 C spike at the beginning? I have absolutely no idea what might have caused that. It happens suspiciously close to the beginning of this whole rise, though.
This long rise started after we dropped the power by switching from heating with both wires to heating with only the Celani wire. After the temperatures fell, they jumped back up and started rising. Just before that is the mysterious T_Ambient spike. The impedance of the Celani wire also started rising.
And the impedance has continued to rise smoothly ever since except for when we changed the power level.
The next suspect is the pressure dropping, which it did all day. As the pressure drops, the gas effectively insulates better.
So we dug into this to find out how the current conditions compared to other runs. Since we are using the first Helium run with the Celani wire as our current baseline for measurements, we new that the cell was at a lower temperature than those runs. The graph below contains reference points from ALL the calibration runs. The little black triangle is the high point from today. We are above any of the calibrations done before the Celani wire was installed, but still below either of the runs done in Helium with the same wire presumably before it was loaded with Hydrogen and active.
By the way, if there is a software guy, or Excel wizard out there that wants to help, I would be thrilled to get a script that gets the latest data from data.hugnetlab.com and plots that point on a graph with those reference lines behind it. That would be so much faster and easier to tell how the cell is performing
But back to the pressure. To figure out how the cell is performing as the pressure is dropping, Malachi the wonder-engineer graphed the rise of the cell temperatures above ambient versus pressure for the calibration runs with this same gas mix. He extracted points at 48 watt power levels from each calibration run. The circles are from the first run attempt on Nov 12th. The squares are from this morning. And the triangles are from this afternoon after it had adjusted to a new 48W power level. The general trend is that as the glass temperatures vary little with pressure while the T_mica and T_well rise as the temperatures fall. We are computing our excess heat based on the T_GlassOut for that reason.
So, pressure drop may account for the rise in T_mica, but may not account well for the rise in the glass temperatures.
None the less, if we are getting excess energy we are clearly not getting enough to be indisputable. In Celani's presentation, he claims it took him over 4 days to reach 10 watts. Since we have a questionable wire that we have attempted to "repair", who knows what to expect.
I think I will let it simmer over the holiday weekend and see if it continues to rise.
There have been some questions about the gamma detector. It is set up and running. The NaI detector is outside the shield, or about 15+cm from the cell. Every day or two I save the spectrum and start a new one. I have not taken time to dig into them. Anybody want to check them out and see if anything stands out?