The digital revolution, accelerated by the growth of the Internet, the constant increase in computer and network capacity, and the storage of data in the dematerialised Cloud, has led to the construction of more and more industrial buildings to house ever-greater numbers of computer servers. These servers need a lot of energy to operate, but also to cool down and avoid overheating. Finally, they also need to be in continuous service, 24 hours a day, 7 days a week, and cannot depend on a breakdown in the network.