In many cases, e.g. the thermal hydraulics of thermal waters, or the HDR or the one tube heat extraction, the estimation of the rock/water heat exchange is of central importance. It now turns out, that not infrequently the thermal properties of water and rock are so different that the the properties of the water can be neglected. This leads to a drastic simplification of the rock/water heat exchange. This is shown by an example, the heat loss of the thermal water in the discharge section.
It is strange that apparently no one has seen this so far.
not sure if i entirely understand the argument here. The thermal conductivity of water is relatively low compared to rocks, so that would make thermal resistance of water relatively high, instead of low. And therefore neglecting pore water in the thermal resistance of porous or fractured rock would not seem justified. Unless the argument is that the porosity of fractured rock is so low that therefore heat conduction by water in fractures can be neglected
The resistance is not a property of a substance, but primarily a property of the geometric configuration of this substance. And often the water layer is thin and therefore resistance is small. And Your discussion about the porosity tells me that I do not have to go into details about this in my text. Best thanks C.
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