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Études du refroidissement par free cooling indirect d’un bâtiment exothermique : application au centre de données

Abstract : A data center is a warehouse that contains telecommunication equipment, network infrastructure, servers, and computers. This equipment leads to a very high heat dissipation which must be compensated by the use of cooling systems. Telecommunication standards impose restricted climatic ranges (temperatures and humidity) leading to a very high energy consumption devote to air conditioning. The reduction of this energy consumption constitutes a real challenge which should be raised and solved. Many cooling solutions are proposed as the free cooling solution, which consists in cooling equipment by using external air in propitious climatic conditions. The work carried out during this thesis is based on experiments conducted within a building in real climatic conditions in order to study the cooling of telecom cabinets. During this study, the building configuration was modified, an indirect "free cooling" system was set up and a significant instrumentation was implemented. The objectives are to establish performance factors issued from measurements, to develop and to validate a numerical model in order to predict the thermoaeraulic behavior for this type of solution. Initially, experiments are carried out with a power dissipated inside the building and a cooling provided only by an outside air circulation. Then, significant modifications were made into the building to introduce an internal air circulation in a closed loop in order to evacuate the heat dissipated inside cabinets by a crossing airflow. In order to get a convincing database, measurements were conducted by using one and then several cabinets in different conditions. Modifications are made to operating parameters in order to better understand the installation operation and to define the energy optimization parameters. Numerical models are developed through TRNSYS / TRNFLOW. The confrontation of simulations with measurements shows the implemented approach relevance.
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Yazid Kaced. Études du refroidissement par free cooling indirect d’un bâtiment exothermique : application au centre de données. Thermique [physics.class-ph]. Université de Bretagne Sud, 2018. Français. ⟨NNT : 2018LORIS499⟩. ⟨tel-02344851⟩

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