Underground thermal energy storage
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United States of America Patent
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Sep 29, 2020
Grant Date -
Mar 29, 2018
app pub date -
Dec 1, 2017
filing date -
Jun 28, 2013
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Abstract
Underground thermal energy storage in a cylindrical or n-gonal prism shape with a vertical axis, comprising an inner volume for holding a liquid, an outer wall, an inner wall around the inner volume, and a filling layer between the inner wall and the outer wall. The inner wall comprises a series of modular wall parts provided with a heat exchanger for exchanging thermal energy with the liquid. The modular wall parts, arranged in rings, contact the inner volume and have an elastic sealing limiting liquid flow between the inner volume and the filling layer and taking up thermal expansion of the modular wall parts. The filling layer comprises an insulating layer designed to keep the outer wall below 30° C. when the inner volume is at least 90° C., and a structural layer for maintaining the insulating layer and the inner wall's modular wall parts in position.
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