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V1.3 US Cells - Pre-calibration & Wires Installed

Scritto da Ryan Hunt on .

The US team has completed the Pre Calibration  (Step 0 in the V2.0 Protocol Table).  I know it is not very impressive sounding to say we got through step zero, but it is an important piece of validating how the cells perform and how reliably they measure before we put in the Celani wire to test it.  Getting a clean base line, or several in this experiment, is critically important.  

The main questions we asked were: 

  1. How stable and consistent are the temperatures we achieved at certain powers?  How stable is it over a long period at a constant power?
  2. How much difference was there between these identically manufactured cells?
  3. How much difference in temperature readings are there when heating with one wire versus the other?
  4. Do the temperatures achieved validate Celani's Stefan-Boltzman estimation of calorimetry?

 

Repeatability and stability

To answer this question we did several calibration cycles and calculated the confidence intervals based on the variability seen, just like previous experiments.  We last did these as a practice before adding the environment shell around the cells and measured confidence intervals after about 5 tests of roughly 1/2 a watt.  Steps 5.a and 5.b in the protocol will have us recreate these while the Celani Wires are in place.

 

The third part of Step 0 in the protocol is holding the power constant for 16+ hours and observing how much the key measurements changed over that time.  Below is a table summarizing the results.

Table of variation of temperature rise above ambient within the cell and on the glass over 20 hours at constant power (30 second averages of ~3 second data).

 

CELL A

CELL B

 

Ta_ext1_rise

Ta_mica_rise

Tb_ext1_rise

Tb_mica_rise

Max

80.24

152

82.89

154.43

Min

79.35

150.57

81.29

152.78

Max-Min

0.89

1.43

1.6

1.65

% Deviation

1.12%

0.95%

1.97%

1.08%

 

 

Difference between cells

After some early calibration tests showing large variation between the two cells, we engineered a better temperature controlled environment that would be less susceptible to air currents in the room changing.  The measured ambient in that environment is nice and stable, 

 

 

Difference between wires

 

 

 

Fit to Stefan-Boltzman

We found that, in our covered apparatus, at least, the Temperature vs Power In curve did not fit well to a constant factor.  I welcome anyone else to try to see how well they can make it fit.  

The latest calibration cycle: NiCr+Ox_130430_PreCal_CellA_CellB.xls

The Calibration cycle before that before we enclosed the cells:  NiCr+Ox_130408_Vac_Calib.xls

 

I, also, eagerly anticipate Mathieu's data because his dual cells are in open air in a large room, so the thermal radiation will be more applicable.

 

We have not really come to any conclusions about the meaning of all this.  Being that the cells are very close in design to Celani's original, I do think some comparisons can be made to the repeatability and stability his cell could have been expected to demonstrate.  Thoughts?

 

Pictures of 400 Layer Celani Wires being installed into the US Cells.

Yesterday, after completing the calibration cycles and analysis, Malachi installed one 400 layer wire into both test cells.  The images are added to this gallery.

After some much needed maintenance and cleaning, we finally had the time for Celani wire micrographs. Also note we figured out how to display a FIGURE KEY. This image is 434L (US cell B) treated wire with a small abnormality among the fuzzy topography typical of a Celani-treated surface. 

 

SEM images being taken

An important part of the plan is to take SEM images of the  wire before and after.  Here you can see Wes inspecting a crack in the outer layer of the wire.  We'll publish the images soon after we get a good set.  Today, we can't figure out how to get the scale bar onto the CRT that faces the camera (we don't have the direct digitizer box).

 

 

Some days it feels like you have to build the sidewalk before you can take a walk.  We have been troubleshooting and improving the power supply control and the data collection a fair amount this week as we struggle to get data out of the experiments and verify it.

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