First, sorry about a n00b question.
Here's the graph:
The x=30, y=0.5 is an approximation. The other two dots are measured. My goal is to mathematically describe/calculate
y based on arbitrary
I'm regulating heating with Raspberry Pi and I have noticed that, to get increase of 1 deg C, the heating needs to work for 1/2 hours when the outside-inside temperature difference is ~10 deg. C. The measured time needed to increase room temp for 1 deg C rises to 1 hour when the in-out diff is 20 deg C. (And, as I said, 30 deg delta is approximated, for now).
heating_speed (y axis, measured in
C/h) as function of
temp_delta (x axis, measured in
C) just "feels" that it can not be linear. But, I could be mistaken.
Additionally, I'm not interrested in the freaky border cases when the in-out temp delta is > 40 C. In those cases, I believe, the current heating power will not be sufficient to keep the temperature stabile and it will probably have negative
Possibly, the function is linear, like this (blue):