Digital twins applied in public buildings. The auditory of the provincial council of Alicante (ADDA) as a case-study

The recent energy cost crisis has increased the high energy and maintenance costs for public administrations of their public buildings. In addition, the gradual increase in temperatures over the last 25 years accentuates this problem. However, technological advances have enabled the creation of new tools such as digital twins that provide insight into the performance of buildings under different conditions and allow the creation of preventive maintenance plans to correct malfunctions and improve their performance in the future. The ADDA (Auditory of the Provincial Council of Alicante) with 28,000 m2 is one of the buildings with the highest energy consumption in the province of Alicante (Spain) and due to its design and the high temperatures registered during a large part of the year, it requires continuous use of its air conditioning systems to guarantee acceptable conditions. This research describes the process of creating and validating the digital twin of the ADDA's symphony hall with the aim of understanding its operation and the impact of people on indoor climatic conditions. Starting from BIM geometries and applying energy calculation engines, it has been possible to digitally replicate the functioning of the most emblematic hall of the building and identify possible strategies to improve its performance