Following our discovery of the vacuum drift and temperature rise (Mini Update US) we decided to replicate these findings. Before we swept the vacuum range we would be operating in (1 to 14 mbar) there were a few things we wanted to take care of.
First, we noticed a pressure leak in the pressure tee of Cell B. Second, we wanted to test out the addition of thermal grease between the glass and copper bands of the exterior thermocouples on Cell B (also applied to Cell A if positive results on Cell B). Third, we wanted to employ Robert Ellefson's suggestion of using weather stripping to seal the bottom edges of the temperature control box.
Once these were taken care of, we turned on the cells and waited for an equilibrium. We then stepped down in pressure from 14 mbar to 0.38 mbar. Here are our results:
| Cell A | Cell B | ||
| Vac (mbar) | T_Ext1 Rise | Vac (mbar) | T_Ext1 Rise |
| 14.1409 | 53.53 | 14.1416 | 55.25 |
| 12.3715 | 53.38 | 12.3713 | 55.12 |
| 8.2167 | 53.80 | 8.2170 | 55.51 |
| 3.0103 | 53.61 | 3.0103 | 55.27 |
| 1.4507 | 53.19 | 1.4506 | 55.09 |
| 0.3815 | 52.47 | 0.3815 | 52.51 |
We can see that our temperature rise over ambient varied little within our range from 1 to 14 mbar. Also, there is no clear relationship between the temperature and a decreasing pressure in our range. However, if we go much below 1 mbar, we could have a problem.
For our operating range the standard deviation for Cell A is 0.23 C and for Cell B it is 0.17 C. The tightness of B compared to A is most likely the thermal grease present under Cell B's copper bands. So, we will apply thermal grease to Cell A as well.
Within our range of operating pressure(1 to 10 mbar), we can safely say that we won't see a pressure dependent temperature reading from our exterior thermocouples.
Our next steps in preparing the V 1.3 Cells for the V 2.0 protocols are to:
- Add thermal grease to Cell A underneath copper bands
- Continue to step 1. of the protocol designed for this experiment. Also shown in this table.
Comments
Quick update. We have found a few bugs relating to the power controller. Our problem was that the power wasn't controlling as tightly as we have seen before. This will be worked on over the weekend and hopefully fixed.
In them mean time, we have the controllers working well enough to re-run the tail end of our pre-calibration on the oxide wires. This will be done over the weekend to complete our data set and then next week we will be at the point of loading celani wires inside our cells.
In regards to the LENR stick. We are going to pressurize it to 10 bar and let it run over the weekend. Hopefully there will be some more loading and some interesting activity.
We have to do another pre-calibration because our temperature control box had a little problem. A flap cam off and changed our airflow inside the box. In our protocol for the V 1.3 experiment, this is step 0 :) So, no excess, yet.
It should hold, 15 watts is right in the middle of our range. We don't know this for sure. Our preliminary calibration could tell us this once it is completed.
@ Edwin
I think you are right, especially for Cell A. Though, now we have thermal grease under Cell A's TCs. It should be tighter now like Cell B.
How, is the question. We will try to turn off the effect, assuming there is an effect to turn off :) Suggestions will be welcome before that moment arrives.
How about making the range 3 mBar to 10 mBar? It does not seem so constant between 1 mBar and 3 mBar.
Step 9 burn time is of interest to me. I hope you have a chance to do this.
What do you mean by disable active cell in step 11? How will you disable it?
Ed
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