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[DaS Energy]

Except that this concept runs headlong into the 2nd Law of thermodynamics whether you like to admit it or not.   If you had a 'ground heat' reservoir at -40 then you better hope you have a sink at a lower temperature than this for the concept to work at all. It does not

I'd suggest your -40 heat reservoir is far more likely to be the low temperature sink rather than the source, and then yes it would work in the opposite direction in most temperate climates. Good luck on finding that - 40 C heat sink.

Hello LibreEnergia,
Late reply. Your good luck on finding temperatures below -40*C while gratefully received is not needed given the many and varied locations of people habitat where temperatures are -50*C and below.

[pix]

@Das Energy
Any ORC setup will do better.
With any refrigerant, different temperature means pressure difference- this is understood.
The key is a proper expander.
Any positive displacement machine will be good- scroll, screw and even vane.


Regards,
Pix

[DaS Energy]

ORC ?

[pix]

ORC ?

Hi Ds Energy,
Organic Rankine Cycle.


Cheers,
Pix

[DaS Energy]

Hello Pix,
Thank you. Organic Rankin Cycle.
"Geothermic heat sources vary in temperature from 50 to 350°C. The ORC is therefore perfectly adapted for this kind of application. However, it is important to keep in mind that for low-temperature geothermal sources (typically less than 100°C), the efficiency is very low and depends strongly on heat sink temperature (defined by the ambient temperature)."
DaS Energy employs an 82% hydro efficient turbine. Other energy loss be the friction of the water against the casings. It highly efficient at temperatures below +100*C. In fact its highest heat is +100*C.
Do you know of which if any ORC that employ a hydro turbine?
Regards DaS Energy