passive single-phase thermal pile
Link: http://w3id.org/permafrost/v/ipaglossary/t0232
Within: IPA Permafrost Glossary
Definition: A foundation pile provided with a single-phase natural convection cooling system to remove heat from the ground.
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passive single-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 single-phase thermal piles usually contain a sealed tube with a small radiator above the ground surface, and are filled with a liquid or gas which does not change phase. During the winter, heat from the soil surrounding the embedded portion of the pipe is absorbed by and thus warms the working fluid, which rises to the above-ground radiator section of the pipe exposed to the cooler air and loses its heat by conduction and natural convection.
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https://doi.org/10.4224/20386561
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