The depth of the borehole for the heat pump and its efficiency

Question

Hello
I have the opportunity to get the WAMET drilling rig (the guest will not use the equipment). Officially, this is what I know the guys were drilling to a depth of 250 meters, and they did not try any more because there was no such need. Is such equipment suitable for drilling to greater depths, e.g. up to 1 km? Will a 500m, 1km borehole be more effective for a heat pump than a 200m deep borehole?

berthold61 · Answer

It makes no sense to drill so deep there, because the temperature is rising there, I will skip such dyrdimały as permits, it is enough for the pump to be up to 30 meters and sometimes 70 meters,

strucel · Answer

Since the temperature rises, it is ok, worse where to get a circulation pump that will provide a kilometer of circulation 500m deep and how much energy will be consumed by such a pump.

woytas73 · Answer

The temperature is less important, it counts as an annual average, which is reachable already at a depth of 2 m, we drill deeper to obtain a sufficient amount of the factor for the lower spring, sometimes 30 m and sometimes 80 m is enough. So much for the topic.

also · Answer

I think I will write a request to the pump manufacturer if there would be no problems at such a depth. Now they recommend a direct evaporation collector. The medium (R 290 propane) circulates in such an extended cycle, which evaporates in the collector, taking heat from the ground. For every 100 meters drilled, the temperature rises by 3 degrees C. At a depth of 500 meters it would be 30 degrees C so there is something to fight for. He does not care about the permits because if I want the clerk to check if the pipe is allowed 50 meters or 500 meters.

Lisciasty · Answer

No point in digging with the horse. The ready probes are at 100m, make 2-3 boreholes per 100m, connect in parallel in the well and you're done.
Drilling at 500m is a gross exaggeration and something may go wrong along the way. Or during operation.

berthold61 · Answer

Just be careful that some miner's helmet does not drill through, since you have both ends of the pipe with you, each pump will pump without any problem because it does not have to lift anything but set the water in motion.

Lisciasty · Answer

I understand that the pressure drop and the friction against the pipe walls magically disappear and you can pump a 50W pump for a kilometer? :]

berthold61 · Answer

Simple, no, but up and down, have you ever done with the pumps? I saw it and it works, but these were rather big matters, but after the engine power loads it can be concluded that you do not need too much energy vertically and with the ends at the same height.

Lisciasty · Answer

Yes, if you have a thick pipe. I saw a flat collector from one section of PE32, 500m. The circulation pump was probably 500W,
the fact that it was assembled from 15 years ago, so the prehistory of Polish pumping, but the fact is a fact. This is why a parallel system is made
so as not to install a monstrous pump and not waste energy for nothing.

strucel · Answer

Well, the flow resistance will be massive, besides, with water, the static pressure of a 500-meter pole is 50 bar, I do not know if the PE pipe will withstand this.

The depth of the borehole for the heat pump and its efficiency

Can I drill a 500 m or 1 km borehole for a heat pump, and would it be more efficient than a 200 m borehole?

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