3 ms·

+100°C (relative to some other temperature not clearly explained, probably the rock) vs 90°C absolute temperature.

• andrelaszlo 3y ago
  That would mean that the rock baseline would be 10 degrees below freezing, which seems improbable. I think it would be close to the yearly average temperature for Helsinki (6.5°C) that close to the surface. Maybe I'm missing your point?
  • notforviewingit 3y ago
    The heat store is used in the winter when it is cold.
  • euroderf 3y ago
    6.5 sounds right. Average ground temperatures down where they are stable are under ten degrees C. So this project will definitely warm up the surrounding rock, which (I guess) will increase its effective heat capacity.