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
