Seite - 101 - in Intelligent Environments 2019 - Workshop Proceedings of the 15th International Conference on Intelligent Environments

3.1. Hotels The Balearic Government, over the years has performed more than 200 energy audits for hotels within the archipelago. These audits represent 10% of all hotel buildings, and their usage sums up to more than 12 million of nights spend. The objective of these energy audits is to examine the energy management by the hotel owner and to find out occasional tactics that can improve the energy efficiency by the installation of renewable energy sources (RES). From these audits we discern that electric energy most used in the Islands’ hotels, and it is present in all of the hotels. The unitary energy consumption per night spend changes a lot depending on various factors; facilities provided, category of hotel, occupancy, geographical situation, weather conditions, nationality of clients (habits), architecture of the building, design and control of the installations, among others. With the increase in standard of living, services that were considered as luxurious now are included in the basic services, as the hotels have improved the buildings and they have increase the facilities, like SPA and acclimatized pools. It is hard to convince hotel owners that even if solar energy or heat recovery systems were used only for heating water that this amount to a saving of more than the 18% of the total energy consumption, as well as a saving in this energy cost, amounts, and a reduction in CO2 of about one kilogram per night spent. From these audits, we discern that the energy more used in the Islands´ hotels is the electric, owing to 54% of the total energy consumption, while gas and diesel are not used in all the hotels. The factors for predict the energy consumption are de Cooling Degree Days, Heating Degree Days and number of Night Spend. The most important factors that until now with the most influence on the unitary consumption are: the HVAC service and the occupancy. Table 2 . Resume of some Balearic Islands Hotels Energy Audits. Correlation Index per night spend or HDD/CDD. Index. Source[2]. Years 2010-2018 Hotel R2 Methodolgy BB 0.91 NS CB 0.89 NS BE 0.80 HDD PB1 0.86 NS SBH 0.85 NS FA 0.93 NS ME 0.92 NS A.Moià-Pol etal. / IntelligentEnergyConsumption in theBalearic IslandsHotels 101