Telecommunication sector is nowadays among the largest electricity consumers. This is fast growing thanks to the increase in the power density of the installed devices: traditional power densities were below 1 kW/m2, while in the case of latest data centers there are power densities of about 11 kW/m2 [1]. Air conditioning represents a significant contribution in the energy balance, as the devices must operate in appropriate ambient conditions. In this paper the potential reduction of primary energy consumption that can be achieved through with free cooling and adiabatic free cooling is examined. Due to the specific requests for the operation (standard ETSI) the analysis must be conducted considering realistic annual temperature and humidity profiles, not only average profiles. For this reason, a probabilistic climate model is developed and tested. Moreover, the effects due to the configuration of the various devices and the characteristics of fresh air supply and extraction systems are evaluated and accounted. This is obtained using both computational and experimental analysis. Several areas in Mediterranean countries are considered.

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