Oops. I should have said: Evidence for excess heat is found because T2 is much hotter than T1. *T1 is touching the resistance heater*, which should be the hottest place in the system.
Heat escapes by various paths, but no matter how complicated those paths are, I am pretty sure that with no reaction in the cell, a thermocouple touching the electric heater should be the hottest in the system. All the heat originates there. Every other spot in the cell has to be cooler than that. Just because the cell core is hotter, that does not prove it is producing cold fusion heat. It might be a chemical reaction. But Jiang says the reaction continues for such a long time that is ruled out: "The calculated energy density is 4 orders of magnitude greater than the value of gasoline. Therefore, the origin of excess heat cannot be explained by any chemical energy." - Jed
