Abstract
Shallow geothermal energy systems have the potential to contribute to the decarbonization of heating and cooling demands of buildings. These systems typically present drawbacks as high initial investments and occupancy of wide areas. In this study, a novel energy wall system is proposed to overcome the limitations of conventional geothermal applications in urban areas. The system is characterized by ease of installation, low initial costs and applicability to existing buildings undergoing energy retrofitting. The paper illustrates the implementation of the prototype of such a system to an existing structure in Torino (Italy). An overview of the components is given together with the interpretation of an illustrative test carried out in heating mode. The data from both heating and cooling experimental campaigns allow us to highlight the potential of the proposed technology. The results suggest that an average thermal power of about 17 W per unit area can be exchanged with the ground in heating mode, while an average of 68 W per unit area is exchanged in cooling operations. The negligible impact on the stress–strain state of the wall and the surrounding soil thermal and hygrometric regime is also testified by the results collected. These aspects are associated with a reduced probability of interferences with other installations in highly urbanized areas, easiness of installation and affordable cost.
Highlights
Decarbonization of heating and cooling systems for buildings plays a major role in the perspective of climate change mitigation
This paper presents a novel very shallow energy wall system developed at the Politecnico di Torino to overcome some of the limitations affecting traditional energy geostructures and horizontal collectors
Shallow geothermal energy has been proved to be an effective solution in decarbonization of the energy demand of buildings despite the high initial investment costs and the land scarcity issues in urban areas
Summary
Decarbonization of heating and cooling systems for buildings plays a major role in the perspective of climate change mitigation. Air conditioning represents about half of the primary energy consumption in Europe [1]. In this respect, heat pumps have gained much attention in the last decades because they induce the electrification of the heating/cooling demands and the electricity needed can be produced from renewable sources [2]. GSHP systems are usually classified as closed-loop or open-loop schemes. While the latter generally allows for higher efficiencies, the former class of systems is safer from the environmental point of view since it does not exchange mass with the environment.
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