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## Error

Hello Everybody,
I want to modell a fully discreted bore hole heat exchanger, and callculate the extracted energy.
So I inject water at a well(s) with a constant temperatur (BC1 (heat) and BC4 (flow)). At another well I withdraw water again (BC1(flow) or BC4(flow)).  On the way between the wells the water gets heated.
How can I callculate the energy the borehole heat exchanger is extracting? So i want feflow to do something like this:

E= Q*T[sub]in[/sub]*C -  Q*T[sub]out[/sub]*C = delta(T)*Q*C

E= Heat (J/d)
Q=discharge (m³/d)
T[sub](in)[/sub]=Temperatur(°K)
T[sub]out[/sub]=Temperature(°K)
C=Heat capacity (J/°K/m³)

This should be possibe with the budget analyzer but how?

special thanks to Mr.Rühaak, your are really helping me with my thesis

regards
Nils

Dear Nils,

yes, you can calculate this energy amount by using the Budget Analyzer, but not directly.
You have to calculate separately the budget for both nodes (use the "Save results in protocol file" option).
Afterwards you can calculate the energy transfer by using the differences between both results (e.g. using a table calculation program like Excel).

Even simpler it is to assign observation points to the in/out nodes and work directly with the temperature result.

Kind regards
Wolfram

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