One of the main innovations of the H2020 "Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps" (acronym Cheap-GSHPs) research project, was the development of a coaxial ground source heat exchanger and drilling machine components to reduce the total installation cost using the piling method. These developments include the geometry of the heat exchanger, primarily a larger diameter and a co-extruded internal plastic pipe, to improve thermal extraction as well as the development of a drilling head combined with high pressure water injection to reduce the installation time. All these innovations, reduce significantly the installation costs in unconsolidated soil, especially when borehole stabilization measures are needed. The drilling machine remains small and compact since the installation method used requires much less power. A patent request has been filed in Italy (patent request n.102018000011157 of 17/12/2018). The enlarged coaxial heat exchanger was installed at five demonstration sites using the new drilling machine components and installation methodology. Historical buildings are part of these demonstration cases supporting the applicability of this technology in this type of buildings. All sites are monitored and demonstrated important gains of thermal energy extraction rate under transitory operating conditions when compared to the state of art. The developments are being improved further as part of the on-going "Most Easy, Efficient and Low Cost Geothermal Systems for Retrofitting Civil and Historical Buildings" (acronym GEO4CIVHIC) H2020 research project. One of the objectives of this latter project is to improve the power of the drilling head and making the machine more compact to enable the cost-effective application of this installation method and the coaxial heat exchanger in retrofitted buildings in built environments and historical districts. This paper evaluates the yield obtained and the potential cost reduction of this novel heat exchanger combined with this innovative drilling technique.
Innovative coaxial heat exchangers for shallow geothermal
Francesco CICOLIN;Gianluca CADELANO;Adriana BERNARDI
2020
Abstract
One of the main innovations of the H2020 "Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps" (acronym Cheap-GSHPs) research project, was the development of a coaxial ground source heat exchanger and drilling machine components to reduce the total installation cost using the piling method. These developments include the geometry of the heat exchanger, primarily a larger diameter and a co-extruded internal plastic pipe, to improve thermal extraction as well as the development of a drilling head combined with high pressure water injection to reduce the installation time. All these innovations, reduce significantly the installation costs in unconsolidated soil, especially when borehole stabilization measures are needed. The drilling machine remains small and compact since the installation method used requires much less power. A patent request has been filed in Italy (patent request n.102018000011157 of 17/12/2018). The enlarged coaxial heat exchanger was installed at five demonstration sites using the new drilling machine components and installation methodology. Historical buildings are part of these demonstration cases supporting the applicability of this technology in this type of buildings. All sites are monitored and demonstrated important gains of thermal energy extraction rate under transitory operating conditions when compared to the state of art. The developments are being improved further as part of the on-going "Most Easy, Efficient and Low Cost Geothermal Systems for Retrofitting Civil and Historical Buildings" (acronym GEO4CIVHIC) H2020 research project. One of the objectives of this latter project is to improve the power of the drilling head and making the machine more compact to enable the cost-effective application of this installation method and the coaxial heat exchanger in retrofitted buildings in built environments and historical districts. This paper evaluates the yield obtained and the potential cost reduction of this novel heat exchanger combined with this innovative drilling technique.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
