Analisi energetica e studio di fattibilità di un impianto di solar cooling a servizio di un hotel

Il calore del sole diventa energia frigorifera sostenibile economicamente ed energticamente. Gli sviluppi tecnologici degli ultimi anni nel campo dell’energia solare consentono consentono di realizzare quanto apparentemente in contraddizione con i fondamentali teoremi della fisica classica ed in particolare della termodinamica. Questo elaborato vuole analizzare come, se e in quali casi sia conveniente l'installazione di un impianto di solar cooling per la climatizzazione estiva di un edificio. Partendo dal problema, sempre più attuale, dei crescenti consumi di energia elettrica per il condizionamento estivo degli edifici, dalla ricerca bibliografica è emerso come inizi a farsi strada, come soluzione percorribile e logicamente interessante, l’utilizzo dell’energia solare, fruttata in impianti che prendono il nome di impianti di solar cooling.

Touristic water demand: analysis and validation of drinking water consumption data and hotel characterization in Benidorm (Spain)

The work analyses the tourist water demand in Benidorm, a sun-and-sand destination ranked fourth in Spain by number of visitors, where tourism competes with local residents, nature, agriculture and industrial sectors for scarce water resources. In particular, we have studied the correlation between the water consumption of 83 hotels in Benidorm and their characteristics and services which can impact water use. For this purpose, we have examined the water consumption billed, by the water utility company HIDRAQUA in the period January 2010 - October 2022, to the tourist structures in the municipality of Benidorm, and we have explored the hotels’ features, thanks to the collaboration of the tourism and hotels association HOSBEC. To give a better understanding and contextualization of our analysis we first described explained the of the complex water supply system and the efforts that have been made to reduce the threat posed by the peculiar climate conditions of the region. We saw that the water consumption per guest has slightly decreased in the recent years and that the tourist flux has increased: the global pandemic posed a stop to travels for more than one year, but now both the tourist flux and the tourist water consumption are reaching pre-pandemic level. We found that larger hotels, and in particular the ones opened all the year, that probably tend to offer more water-demanding service with respect to the seasonal ones, have higher water consumption per bed. From the analysis of the role of the different hotel characteristics over the water demand patterns, we found that water use increases with the increase in the hotel category and in the ratio between the surface area of the swimming pool and hotel size (number of beds). Other factors impacting the consumption are the presence of an on-site laundry for washing the hotel linen, the garden, and the implementation of environmental policies for water-saving.