Dear Feflow-community,
I'm quite new to working with feflow and hence, am struggling with some issues.
I've built a quite simple structured 3D-model with several layers including an
aquifer that is confined by low-permeable layers.
This aquifer should serve as an ATES-aquifer with several injection and
production wells. All wells are already implemented with the ideal cell size,
according flow rates as well as a temperature bc at the bottom node of each
well.
First simulations are working quite well, however, I'm observing a weird effect,
as after the first year (1 injection and 1 production cycle), I can extract more
energy/heat than I injected, although I injected 90°C into a reservoir with 13°C
ambient temperature.
Has anyone observed a similar effect and explain the reason? I am seeing another
effect I cannot explain, as after each switching point (from injection to quiet
phase and from quiet phase to production), the temperature shortly drops by
~20°C...why? What's the problem here?
And one last question: If I group the wells and want to assign a temperature
difference in the "Open Loop" property of this well group, how do I need to
prepare the t-difference time series/how do I use this option? What t-difference
is meant here (I don't really understand the feflow documentation explanation)?
Can anyone maybe help me with these three issues?
Many thanks,
Simon
