thermosyphon
Link: http://w3id.org/permafrost/v/ipaglossary/t0372
Within: IPA Permafrost Glossary
Definition: A passive heat transfer device installed to remove heat from the ground (see Figure 24).
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thermosyphon
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thermosiphon fr |
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A thermosyphon, also called thermotube, or heat pipe, usually consists of a sealed tube, with a small radiator above the ground surface, containing a liquid and/or gas. These devices have no moving parts, require no external power for operation, and function only when air temperatures are lower than the ground temperature. They may be either single- or two-phase systems. A single-phase thermosyphon is usually liquid- or air-filled. 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. A two-phase thermosyphon contains a working fluid that can be in either 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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| dcterms:source |
https://doi.org/10.4224/20386561
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