Scientific articles

WP9 – Papers published in the timeframe May-October 2017

Paper: Zarrella, Angelo, Giuseppe Emmi, Samantha Graci, Michele De Carli, Matteo Cultrera, Giorgia Santa, Antonio Galgaro, et al. “Thermal Response Testing Results of Different Types of Borehole Heat Exchangers: An Analysis and Comparison of Interpretation Methods.Energies 10, no. 6 (June 13, 2017): 801.

URL: http://www.mdpi.com/1996-1073/10/6/801

Abstract: The current study examined the interpretation of thermal response testing measurements used to evaluate the equivalent ground thermal conductivity and thus to design the system.

Paper: Galgaro, Antonio, Giorgia Dalla Santa, Matteo Cultrera, David Bertermann, Johannes Müller, Michele De Carli, Giuseppe Emmi, et al. “EU Project ‘Cheap-GSHPs’: The Geoexchange Field Laboratory.Energy Procedia, European Geosciences Union General Assembly 2017, EGU Division Energy, Resources & Environment (ERE), 125 (2017): 511–19.

URL: http://www.sciencedirect.com/science/article/pii/S1876610217336755

Abstract: The Molinella test site (Italy) is the open-air laboratory of the UE project “Cheap-GSHPs.

Paper: Dalla Santa, Giorgia, Fabio Peron, Antonio Galgaro, Matteo Cultrera, David Bertermann, Johannes Müller, and Adriana Bernardi. “Laboratory Measurements of Gravel Thermal Conductivity: A New Methodological Approach.” In Energy Procedia, 125:671–77. Vienna, Austria, 2017.

URL: http://www.sciencedirect.com/science/article/pii/S1876610217337931

Abstract: Direct measurements of gravel thermal properties are usually quite challenging to be performed in laboratory, due to the very coarse sediments size. As a consequence, the reference thermal values provided by literature for gravels are quite limited and dispersed.

Paper: “The EU Project Cheap-GSHPs.” Italian Journal of Groundwater 6, no. 3 (2017).

URL: http://www.acquesotterranee.online/index.php/acque/article/view/296

Abstract: The Cheap-GSHPs EU project is shortly presented in the Italian Journal of Groundwater.

Paper: Emmi, Giuseppe, Angelo Zarrella, Michele De Carli, Stefano Moretto, Antonio Galgaro, Matteo Cultrera, Maria Di Tuccio, and Adriana Bernardi. “Ground Source Heat Pump Systems in Historical Buildings: Two Italian Case Studies.” In Climamed 2017, 133:183–94. Matera, Italy: Energy Procedia, 2017.

URL: http://www.sciencedirect.com/science/article/pii/S1876610217344740

Abstract: The aim of this work is to analyze the thermal behavior of two historical buildings located in Italy, in Venice and Florence respectively. Detailed computer simulations of the buildings have been carried out by means of a transient calculation tool TRNSYS. Energy simulations of GSHP systems have been performed and a comparison with a common plant system using a gas boiler for heating and air-to-water chiller for cooling has been carried out.

Paper: Johannes Müller, Antonio Galgaro, Giorgia Dalla Santa, Matteo Cultrera, Constantine Karytsas, Dimitrios Mendrinos, Sebastian Pera, Rodolfo Perego, Nick O’Neill, Riccardo Pasquali, Jacques Vercruysse, Leonardo Rossi, Adriana Bernardi and David Bertermann. “Generalized Pan-European Geological Database for Shallow Geothermal Installations

URLhttps://orcid.org/0000-0002-6739-2235

Abstract: The relatively high installation costs for different types of shallow geothermal energy systems are obstacles that have lowered the impact of geothermal solutions in the renewable energy market. In order to reduce planning costs and obtain a lithological overview of geothermal potentials and drilling conditions, a pan-European geological overview map was created using freely accessible JRC (Joint Research Centre) data and ArcGIS software. JRC data were interpreted and merged together in order to collect information about the expenditure of installing geothermal systems in specific geological set-ups, and thereby select the most economic drilling technique. Within the four-year project of the European Union’s Horizon 2020 Research and Innovation Program, which is known as “Cheap-GSHPs” (the Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps), the most diffused lithologies and corresponding drilling costs were analyzed to provide a 1 km  1 km raster with the required underground information. The final outline map should be valid throughout Europe

Paper: Dimitrios Mendrinos, Spyridon Katsantonis and Constantine Karytsas. “Review of Alternative Pipe Materials for Exploiting Shallow Geothermal Energy” Centre for Renewable Energy Sources and Saving, 19th km Marathonos Ave., 19009 Pikermi Attikis, Greece.

Abstract: Shallow geothermal energy can be exploited in any location by ground heat exchangers (GHE), which consist of pipes placed either horizontally in trenches or vertically in boreholes in the ground. The cost of the GHE is primarily determined by the pipe cost per unit length and the total required length. For a given type of ground and completion conditions, the main parameter that affects the required length of a GHE is the thermal conductivity of the pipe material. The preferred pipe construction materials are usually high density polyethylene (HDPE) as the plastic with the highest thermal
conductivity, in a much lesser extent cross-linked polyethylene (PEX) for relatively higher temperature applications, and even stainless or galvanized steel in some other installations. In this paper, alternative metallic materials with higher thermal conductivity as well as thermoplastics available in market were evaluated for shallow geothermal use. The evaluation was made in terms of expected GHE service life based on literature review of buried piping systems, estimation of the required GHE length per unit energy output by computer simulations and cost estimation using current market prices.

Paper: David Bertermann, Adriana Bernardi, Luc Pockelé, Antonio Galgaro, Matteo Cultrera, Michele de Carli, Johannes Müller1. “European project “Cheap‑GSHPs”: installation and monitoring of newly designed helicoidal ground source heat exchanger on the German test site

URL: https://doi.org/10.1007/s12665-018-7343-4

Abstract: Nowadays, the energy price fluctuations and the economic crisis are jeopardizing the development and diffusion of renewable technologies and sources. With the aim of both reducing the overall costs of shallow geothermal systems and improving their installation safety, an European project has took place recently, under the Horizon 2020 EU Framework Programme for Research and Innovation. The acronym of the mentioned project is Cheap-GSHPs, meaning “cheap and efficient application of reliable ground source heat exchangers and pumps”;

Paper: Johannes Müller, Antonio Galgaro, Giorgia Dalla Santa, Matteo Cultrera, Constantine Karytsas, Dimitrios Mendrinos, Sebastian Pera, Rodolfo Perego, Nick O’Neill, Riccardo Pasquali, Jacques Vercruysse, Leonardo Rossi, Adriana Bernardi and David Bertermann. “Generalized Pan-European Geological Database for Shallow Geothermal Installations

URLhttps://orcid.org/0000-0002-6739-2235

Abstract: The relatively high installation costs for different types of shallow geothermal energy systems are obstacles that have lowered the impact of geothermal solutions in the renewable energy market. In order to reduce planning costs and obtain a lithological overview of geothermal potentials and drilling conditions, a pan-European geological overview map was created using freely accessible JRC (Joint Research Centre) data and ArcGIS software. JRC data were interpreted and merged together in order to collect information about the expenditure of installing geothermal systems in specific geological set-ups, and thereby select the most economic drilling technique. Within the four-year project of the European Union’s Horizon 2020 Research and Innovation Program, which is known as “Cheap-GSHPs” (the Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps), the most diffused lithologies and corresponding drilling costs were analyzed to provide a 1 km  1 km raster with the required underground information. The final outline map should be valid throughout Europe

Paper: Dimitrios Mendrinos, Spyridon Katsantonis and Constantine Karytsas. “Review of Alternative Pipe Materials for Exploiting Shallow Geothermal Energy” Centre for Renewable Energy Sources and Saving, 19th km Marathonos Ave., 19009 Pikermi Attikis, Greece.

Abstract: Shallow geothermal energy can be exploited in any location by ground heat exchangers (GHE), which consist of pipes placed either horizontally in trenches or vertically in boreholes in the ground. The cost of the GHE is primarily determined by the pipe cost per unit length and the total required length. For a given type of ground and completion conditions, the main parameter that affects the required length of a GHE is the thermal conductivity of the pipe material. The preferred pipe construction materials are usually high density polyethylene (HDPE) as the plastic with the highest thermal
conductivity, in a much lesser extent cross-linked polyethylene (PEX) for relatively higher temperature applications, and even stainless or galvanized steel in some other installations. In this paper, alternative metallic materials with higher thermal conductivity as well as thermoplastics available in market were evaluated for shallow geothermal use. The evaluation was made in terms of expected GHE service life based on literature review of buried piping systems, estimation of the required GHE length per unit energy output by computer simulations and cost estimation using current market prices.