Good Report on Differential Test in the US - Update 3
This is the most promising result I have yet written about. I put it together into a google doc that is embedded here. As usual, please let us know if I missed anything.
Many thanks to Celani, the rest of the MFMP facilitators as well as the frequent followers, commentators, and ad-hoc contributors.
Video explanation of results:
We put together a real quick video explaining the results in the report. Enjoy.
Next steps:
- in the EU, Mathieu is super close to starting up a very similar test with his cells in differential mode.
- In the US, we will to heat up CuNi2 to get it to load, then watch for additional excess energy
- Perhaps try to drive flux by operating in a partial vacuum and allowing the hydrogen to flow out of the wire.
- Add some Hemholtz coils to put the whole thing in a magnetic field, per a suggestion from Dennis Letts based on his work in electrolytic systems. Below is a rendering of a coil holder intended to hold 100 wraps of 26 gauge copper wire.
Update 9/5/2013
After looking at the data from Ecco's test, it appeared to Malachi that most of the leak was in cell A, so he tightened the threaded rods a little bit in case the leak was in the silicone o-rings. It seems to have worked. The graph below shows the Mica temperature in cell B, the pressure, and the resistance of the fully loaded CuNi_1 wire. It's pretty cool how they all tracked so nicely. The pressure does not have a general downward slope!
Meanwhile, the CuNi_2 wire is starting to load a little more as we start to raise the current in it. It is nowhere near as rapid as previous loading where we went straight to full power, though. We're OK taking our time because Celani suggested loading them in 25 degree steps and waiting till the resistance settles. Our steps are a bit smaller because I am not sure what to expect while the other wire is still on.
Our Helmholtz coils are taking shape. We will test them in open air before we try to put them around the cells. We'll post a picture after get them wound up and powered up.
Second Update on 9/5: The value of motion detectors
Just after we upped power into the cell in our attempt to get the second wire to load cell B started going up to 7 degrees warmer than cell A. This coincided with a good rate of resistance drop, too. We got a little bit excited.
Then we realized that Wes had been in there working on the powder cells around that time. We started to winder if he was causing an airflow disturbance. When he came out, the temperature dropped. We sent him back in and the temperature rose. This is clear on the graph below including the motion sensor data.
This is good to be aware of. We have asked ourselves if this could possibly account for the good results. While we can't rule it out totally, we also can't imagine a way the airflow could have been that far out of balance for that long.
Update 9/6/2013 - Magnetic effects on Cell A?
We set a magnet on the side of the cells several days ago on Sept 3.
Cell A
Cell B
Today, I took it of of cell A to take a magnetic field reading with an app on my phone. I didn't want to disturb cell B. Then I put it back on in nearly the same location with the same magnetic pole up. The magnetic had probably cooled down during that time.
Shortly after that, the power to both cells was raised by 2 watts. Cell A rose very little from the previous temperature.
A bit later Malachi adjusted the location of the magnet very slightly (a few millimeters) to what he remembered was the location it had been in originally.
The resistances of the NiCr wires behaved very strangely. The temperature of the cell behaved very strangely. The graphs below show this.
So the magnet would have been cooler and cooled off the sensor and taken quite a while to come back to equilibrium. But why do the resistance act funny? Especially on the NiChrome wires?? What will this mean when we put the Helmholtz coils in place?
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I suggested in April that selective finishing of the copper bands could give a useful approximation of a metal cell, and could be retrofitted without disassembling the current experiment. Simply apply a black finish to the inside of the bands and polish the outside, with a clear-coat to prevent tarnishing. This would more accurately include the radiated heat in the measurement of the cell. The suspected emissivity differences as the wires age, and the visibly changed reflectivity of the copper due to tarnishing over time would both be reduced or eliminated as unknown errors in the thermal data.
The unstable convection around the cells is harder to deal with. Something like a version of the CTC system large enough to hold the glass cells would be nice. Maybe the fan, diffuser and heater stack from the original air flow calorimeter could be adapted to a big tube enclosure.
I can't tell who is the leader and who is the follower.
This differential method is not working. The reference side is not stable.
i.imgur.com/3aG4N4L.png
It is to do with magnetic alignment in the body of the wire and how that relates to the Hydrogen. It is not about inducing electric current in the wire.
However instead of painting (did you actually mean that?) the wires dark, MFMP could more simply paint the glass tubes opaque, or using (metal) tubes instead of glass ones, which would be a better solution but would also leave potential room for contamination. Foil wrapped on the glass tubes could also be used but might bring a different set of problems.
From the latest MFMP video it's very apparent that the NiCr wires in Cell A are shiny metal gray colored, while the active ones in Cell B are dark brown:
www.youtube.com/.../
The wire is cooled by convection and radiation. Some of that radiation escapes through the tube glass wall without impacting its external temperature. A metal shiny wire radiates less than a dark wire. As a result the control cell must dissipate more heat form its external surface and thus be warmer.
This could explain the differences for low input powers in the curves shown in the video. So it might be that the actual difference in heat dissipation is larger than the difference of the temperature curves. A remedy could be to colour the passive wire dark.
@MFMP: What about putting both cells in two separate open tubes (made of plastic? That would have some advantages. Or of metal with an external insulating jacket) with a temperature controlled constant input air flow, and then comparing the output air flow temperature of both cells? You could set up the cells in a vertical orientation which would help not only keeping the flow controlled and uniform along the cell length, but also saving space.
This would an improvement over the current setup, I think. It will ensure that both cells are receiving about the same air flow. and therefore that they're heating up in the same way, in addition of protecting them a bit from random air currents from lab activity.
EDIT: I'm aware (actually, I just remembered) that you already had something similar in place when you were running this experiment with the v2.0 protocol, but it wasn't quite the same thing as what I am suggesting here.
EDIT2: I couldn't resist making a diagram of what I have in mind. However I can see there might be problems in setting up a good, undisturbed air flow and choosing carefully a good place for measuring output air temperature.
i.imgur.com/y5VBFYS.png
Maintenance (ie disassembling/r eassembling the thing) might also get tricky.
Please do not change applied power. Let's see how far this will go.
[add] not much flux but rising delta T.
[add] plot update 8:40pm east, 5 degrees with little flux? 34 continuous hour of excess heat Letts' Magnets rule!
[add] >0.2MJ
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