T1 is in an air gap apparently. Possibly that could make more sense. On Mon, Feb 29, 2016 at 4:49 PM Jack Cole <[email protected]> wrote:
> Jed, I thought the same when looking at the graphs. It doesn't make much > sense. He needs to get some better control over the input power to keep > from burning up his TCs. > > On Mon, Feb 29, 2016 at 4:13 PM Jed Rothwell <[email protected]> > wrote: > >> H LV <[email protected]> wrote: >> >> Notice the delayed rise in T4 at the beginning of the experiment. The >> >> rise in T4 after power is turned off might just be the delayed >>> dissipation of heat from inside to the outside. >>> >> >> I do not think so. Look closely as the power is being reduced, at around >> time 14:00, shortly before "Power off." (About 7 minutes before.) T4 >> suddenly pops up, from 110°C up to around 120°C. >> >> Maybe that is just noise, but if it is real, it does not look like >> delayed dissipation to me. >> >> Unless the configuration of the cell is changed, I do not see how the >> dissipation could increase suddenly like that. By "changed" I mean for >> example, suppose the MgO insulation is wrapped around and attached with >> adhesive tape. Suppose you loosen the tape. The outside temperature might >> change suddenly. I doubt anyone would make such changes to the cell during >> a test. >> >> If there were heat left in the cell that had to be dissipated after the >> power is turned off, I suppose the T4 curve would continue rising at a >> steady pace for a while, then it would drop off. It would not have leveled >> off after 13:20. It seems the temperature inside the cell continued in a >> stable condition if we can believe that either T1 or T2 was working >> correctly. So there was no large increase in the internal temperature. >> >> Granted there was a sudden increase in temperature in T1 and T2. It >> happens at time 14:20. I just drew some lines on the graph, and I think >> that T1 and T2 go up and reach a peak about 6 minutes before T4 suddenly >> increased. T1 continues for 26 minutes at the higher temperature. >> >> I would not expect T4 to pop up like that in response to the increase >> shown by T1 and T2. I would expect T4 to gradually rise in response to that >> increase. Perhaps it might continue after T1 peaks, but it would be a >> continual, gradual rise. That kind of slow rise is what T4 does after the >> initial jump, followed by a gradual decay. >> >> - Jed >> >>
