20 July 2013: It is some months since I produced an Energy Levels diagram, and since the tee-piece leak and the repair to the leak, it is time to do another. Just before the leak occurred, there was good sunshine and the levels were on the way up nicely. There was a period of time when I was waiting for the replacement tee, the scaffolding was up for a whole month. (The more recent leak of July was fixed so quickly, it doesn't cause a blip on the curve, because it was just equivalent to a couple of cloudy days.
I'm not sure why the curve should drop so steeply at that point in May. Although May was cold, it wasn't cold enough to have the heating on, although hot water was still needed. It could suggest that the borehole had warmed up, but without the additional heat being added, the energy level was dispersing outwards because the temperature had risen to higher than would be normal for May without charging.
|Diagram: Produced by ArchiCAD, using author's data and algorithm July 2013|