Introductory Fluid Mechanics L11 p2 - Example - Bernoulli Equation

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Hello!

If I have, for example, a heat source generating 80W into a diaphragm wall, the diaphragm walls is into the ground, the heat exchanged at the interface ground/concrete could give me the actually energy efficiency of the system? For example, if I need to extract 80W from the ground through this concrete diaphragm wall, can I find out how much of the energy I can actually obtain to say "My needs are 80W, but I can get only 60W from the ground"?

I am studying geothermal energy (energy foundations as diaphragm walls) and I don't know exactly what's happening in the ground because the method I am using consist in treating the pipes within the diaphragm walls (which are in the ground) as heat sources, followed by measuring the exchange heat at the interface of concrete/ground. But I don't understand exactly what this means.

I would really appreciate your answer!!
Thank you!

danieliosif