The study, design, and testing of a system to retrofit and thermally activate an existing tunnel (in operation or abandoned) for an energy purpose not envisaged originally. The system includes a network of pipes capable of transporting a heat transfer fluid. A prototype of such a system is being investigated by means of preliminary numerical analyses with the final aim to install it in the Piedicastello tunnels within the Trento demo. The tunnels, today abandoned and devoted to an exhibition hall, will be turned into a heat exchanger with the ground and with the internal environment for road de-icing and/or heating and cooling purposes of an adjacent building to test the potential of the identified solution in a realistic operating environment.

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Post-Occupancy Evaluations (POEs) offer valuable insight into occupant satisfaction by combining real-time indoor environmental monitoring with user feedback. Over 15 days in both summer and winter, sensors track temperature, humidity, and CO₂ levels in homes, while nearby weather stations provide external data. Occupants complete surveys assessing their perception of air quality, thermal, visual, and acoustic comfort. The results are then analysed to compare measured data with occupant experience, providing a clear picture of indoor environmental quality (IEQ). This approach not only validates the comfort performance of buildings—showing mostly high to medium comfort levels per European standards—but also empowers residents with personalised feedback and supports future improvements in sustainable, user-centered building design.

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The Citizen Energy Community (CEC) model developed in Palma de Mallorca supports the implementation of shared energy consumption schemes with active citizen participation. It combines publicly owned photovoltaic (PV) installations, collective self-consumption models, and citizen engagement activities to support the local energy transition. 

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A smart way to understand how much solar energy can be generated across an entire neighbourhood. Using digital 3D models and energy simulations, it identifies the rooftops and façades best suited for solar panels and helps communities plan renewable energy investments more effectively. Beyond the technical potential, the approach also considers costs, opportunities for local energy sharing and the benefits of involving residents in energy communities. Designed to be adaptable to different cities and contexts, it supports the development of cleaner, more resilient and locally produced energy systems.

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