2.3.3. Water

Water use is one of the more significant aspects of sustainability management considered by the health sector, so it is important that water use issues are not exacerbated when designing a sustainable energy ecosystem [51]. To close the hydrogen water cycle loop, it is necessary to consider the water supply for electrolysis. This is commonly expected to be obtained through the desalination of seawater, which will thus be an important component of renewable energy networks [47]. Alternatively, water can be drawn from the air using an atmospheric water generator (AWG). These adsorption-based devices can utilize thermal energy from solar or waste heat even in arid climates [52]. The other advantage is that the water they produce is of high purity, reducing the need for purification for electrolysis [53].
