I often add the Combined Outside T mean field column when comparing my systems, all of which use the Metoffice data feed, which is not perfect but gives a reasonably accurate trend and seems what most other systems use on HPM. However, I noticed that recently these mean temperatures have dropped quite a bit across the board and now don’t appear to correspond with the value shown for a similar period in the dashboard window - my own system for example, over the last 267 days was around 6.7C, but is now showing 4.2C on the main listing page, but still around 6.7C for the same period in the dashboard window. So quite a change and/or something doesn’t seem to tally. This also appears to have happened to a similar degree to other systems too, ie from around 12.6C to 8.5C etc, which I assume also use the Metoffice data.
Has something changed to the way things are displayed, or am I reading things incorrectly? I think this is a potentially useful metric when evaluating systems, but the data needs to be reasonably reliable across the board. Be interested to know what’s caused the sudden change and also how others find the metoffice data compares to their actual local tempertures.
Indeed, but the two figures use to be the same (or very close), my longterm figures appeared to change overnight a while ago and thought it was a glitch in my feed or a refresh issue etc, but noticed the same with other systems. Maybe they are now being calculated/displayed differently on HPM for some reason, but that’s all a bit beyond me, I just noticed the sudden change
Apologies. While working on some data analysis last week it suddenly occurred to me that mean temperature vs e.g SCOP is going to be less representative than a mean temperature weighted by the amount of heat delivered. What you are seeing is the result of this weighting by heat delivered, hence the lower temperatures.
Should I keep it this way or somehow provide an option to see both?
