NDLI: Evaluation of the Effect of Anti-Corrosion Coatings on the Thermal Resistance of Ground Heat Exchangers for Shallow Geothermal Applications

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Evaluation of the Effect of Anti-Corrosion Coatings on the Thermal Resistance of Ground Heat Exchangers for Shallow Geothermal Applications

Content Provider	MDPI
Author	Cadelano, Gianluca Bortolin, Alessandro Ferrarini, Giovanni Bison, Paolo Santa, Giorgia Dalla Sipio, Eloisa Di Bernardi, Adriana Galgaro, Antonio
Copyright Year	2021
Description	The materials and the technology used to build the ground heat exchangers significantly affect the heat transfer performance of a geothermal system, in addition to the local geological and hydrogeological context. Among expense items such as the coupled heat pumps and the applied drilling technology, the heat exchangers play a key role in the shallow geothermal market. For this reason, they are usually made with plastic. Metal tubes are not widely used because of corrosion issues, which can compromise the reliability of the system over time. According to best practices, metal is an unfavorable choice if the pipes are not made of corrosion resistant alloys, such as stainless steel, but the overall performance is strongly related to the heat transfer efficiency. In this study, laser-flash technique is applied on carbon steel samples with anti-corrosion coatings and on corrosion resistant materials (stainless steel grades used for pipes), thus, allowing the comparison of their thermophysical properties. These properties are used to evaluate each solution in terms of thermal resistance. This study demonstrates that there are no particular corrosion resistant steel pipe configurations that are thermally favorable over others in a critical way.
Starting Page	2586
e-ISSN	19961073
DOI	10.3390/en14092586
Journal	Energies
Issue Number	9
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-04-30
Access Restriction	Open
Subject Keyword	Energies Characterization and Testing of Materials Shallow Geothermal Energy Coaxial Heat Exchangers Pipe Corrosion Renewable Energy Pipe Materials Thermal Properties Coatings
Content Type	Text
Resource Type	Article

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