passive two-phase thermal pile
Link: http://w3id.org/permafrost/v/ipaglossary/t0233
Within: IPA Permafrost Glossary
Definition: A foundation pile provided with a two-phase natural convection cooling system to remove heat from the ground.
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passive two-phase thermal pile
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Natural convection cooling systems consist of self-powered devices, commonly referred to as thermosyphons, or heat pipes, which operate only when air temperatures are lower than the ground temperature. Passive two-phase thermal piles usually contain a sealed tube with a small radiator above the ground surface, and are filled with a substance which can be in the liquid or vapour phase, depending on its temperature. When the air temperature falls below the ground temperature, the vapour condenses in the radiator section of the tube, the pressure in the tube is reduced and the liquid in the lower section starts to boil. The resulting cycle of boiling, vapour movement up the tube, condensation, and return of the condensate by gravity flow is an effective way of transferring heat up the tube, thus cooling the ground.
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https://doi.org/10.4224/20386561
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