Okay, Lewan told me that after the run there was at least 20 L of hot water left in the vessel. He did not measure it the way he did after the September test, but the vessel was pretty full.
If there was any water let in the vessel that proves there must have been some cooling water flowing into it during the test. If the water was going out at the rate of 0.9 g/s (3.2 L/h), and there was no input, the vessel would have been nearly empty after nine hours. There would have been less than 1 L left. I think it is much more likely the average flow rate out was close to the incoming rate, and both were ~4 g/s. Lewan mentioned there was also a leak, which has been discussed here. Some amount of water left the cell via the leak. The important thing is, the replacement water coming in was at tap water temperature. It was coming in from the large plastic trashcan. The flow rate also had to be high enough so that people could see water moving to the pipe. I expect it was closer to 4 g/s than 0.9 g/s, most of the time. This proves the water was cooled down with incoming tap water. Obviously it also radiated a lot of heat. These two facts together prove that it could not have remained at the same temperature for four hours without a source of power inside the cell. It would be much better if we had a detailed record of the amount of water that was pumped into the cell, with a precision flowmeter between the pump and the cell. It would be difficult to determine how much of the water left via the of the leak and how much was vaporized or overflowed and ended up going through the heat exchanger. I suppose you could put another precision flowmeter below the heat exchanger, but even a high precision meter would have difficulty measuring this. To determine how much cooling water displaced the original water in the cell, you do not need to know whether the outflow left via the leak or via the heat exchanger. By the way, if there was no water flowing into the cell, that would mean there must have been intense anomalous heat. Otherwise, the cell would have radiated enough to cool down, and it would soon stop boiling. After that, the water would not have gone from the cell into the heat exchanger. Without a flow of incoming water to displace the existing water, boiling is the only thing that can force it into the heat exchanger. If there had been no flow, and no boiling to push the water into the exchanger, the exchanger would have dropped to room temperature very quickly. It would have done this in the time it takes that much metal to cool down, maybe 10 minutes, It would have registered no Delta T. Even if the reactor vessel had remained hot, cooling only by radiation and not by displaced hot water, none of that heat would have reached the exchanger. - Jed
