Geothermal energy, aquifer

1. The problem statement, all variables and given/known data

See attachment

2. Relevant equations

I guess I need to do something with this equation:
P= cmρJΔT

ρ is then the density of water 1000m3/kg
J is given
Cm is given
But what to do with the temperatures… ΔT= Th-Ta? But then you get a negative number and the ask for the power delivered…

Attached Images
File Type: jpg image.jpg (124.1 KB)

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