Seite - 104 - in Intelligent Environments 2019 - Workshop Proceedings of the 15th International Conference on Intelligent Environments

same category and facilities, depending on the installation design, technology, maintenance and control. This difference in terms of energy consumption between an environmentally friendly hotel that has implemented measures to preserve natural resources and a hotel built during the 1970s and 1980s and not yet refurbished can be from 30% to 60% with all other factors being equal (same climate, same needs). Future scenarios go from reduction of energy and increase the renewable energies. Mallorca have actually facilities of solar, wind and wastes, and a big potential in hydro, biomass and shallow geothermal. Smart Energy measures in hotels have to be carefully selected in order not to endanger the Electric system and increase the maximum Renewable energy in the system. The highest energy demand in hotels comes from HVAC devices, raising the demand of electricity which is the common source of energy in all hotels and the easiest to save and to store with buffer tanks. Accordingly, priority should be given to control energy used in the guests’ rooms, for example, by using simple controls to ensure that practically all electrical appliances are turned off when guest rooms and corridors are unoccupied. A better distribution of the building’s layout and an improved control of energy use result to a potential energy saving between 15 to 30%. The total energy consumption for hot water may represent between 12%-36% of the total energy consumption, which varies according to the hotel category and weather conditions. Average annual energy consumption may reach 1300- 5000 kWh per bed. Installing between 1-2 kWp per bed we could arrive to a sustainable scenario. Figure 4. Estimation of Electric consumption-production , August 2050 The potential average annual energy savings from solar collectors reach 1200 kWh/kWp [9]. Thus they can be used to cover a significant part of the energy demand (80%), and if combined with smart chillers, they can also be used for cooling. The use of heat recovery from the cooling system (i.e. the recovery of waste heat from cooling A.Moià-Pol etal. / IntelligentEnergyConsumption in theBalearic IslandsHotels104