Abstract
Standing column wells, used to provide heating and cooling to buildings, allow significant energy savings. Nonetheless, variations of groundwater geochemistry, caused by temperature changes and CO2 degassing, may favor minerals scaling in the well, associated equipment and the aquifer, which may lead to operational problems. This paper presents a coupled thermo-hydro-geochemical model that allows for predicting reaction rate of calcite. Once applied to a case study representative of a typical configuration, simulations indicate that precipitation, strongly dependent on temperature, mainly occurs at the inlet of the well in summer. Moreover, when the well is not perfectly sealed, degassing may enhance precipitation rate up to 33%. Finally, fracture clogging is avoided when a constant bleed of 10% is applied. This study evidences that the greatest risk of precipitation occurs when the standing column well is subject to degassing, operated with a bleed and installed in a fractured aquifer.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
