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Etude d'un système innovant de rafraîchissement basse consommation pour le bâtiment

Abstract : To face the dramatic increase of energy consumption due to air conditioning use in buildings, new low energy consumption systems need to be developed. This work proposes a new cooling system which aims to be energy efficient, cheap and easy to install. This system takes advantage of evaporation cooling, ground earth cooling and sky radiative cooling techniques. The two main components of this new system are a porous tank set outside and a storage tank set in the basement of the building. When the inside house temperature exceeds the comfort temperature, cool water passes from the storage tank through the cooling floor, removes heat from the building and is then send to the porous tank. The water contained in the porous tank is cooled down due to evaporation and radiative effects and then flows back to the storage. The storage tank installed in the basement enables further cooling of the water thanks to direct contact with the ground. Porous properties and geometry of the tank have a great influence on the cooling performances of the tank. A heat and mass transfer model has been developed to simulate the thermal and hydric behavior of the tank. This model has been used to choose an appropriate tank. A tank giving good performances (70 W/m2 of evaporative power) is identified. The complete cooling system has been installed on a house in Bordeaux and tested at real scale during an experimental campaign. The system worked for 44 days during summer 2015 and allowed to maintain a very good thermal comfort level in the experimental building (insulated, with solar load and without ventilation). Its very low electricity needs brings the average coefficient of performance of the system to 20.8. A numerical model of the system has been developed, calibrated with experimental data and coupled with a building model. Simulation results show that for all tested configurations (climate, shading…), the system clearly improves the thermal comfort in the building. Optimized sizing, keepinp reasonnable tank sizes (storage and evaporator volumes of 2.2 m3 and 0.215 m3 respectively), shows that this system works with an average COP of 24 and maintains a good comfort level in an individual house of 100 m2 located in Bordeaux.
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https://tel.archives-ouvertes.fr/tel-01705310
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Submitted on : Friday, February 9, 2018 - 12:12:07 PM
Last modification on : Tuesday, July 27, 2021 - 10:18:01 AM
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  • HAL Id : tel-01705310, version 1

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Guilian Leroux. Etude d'un système innovant de rafraîchissement basse consommation pour le bâtiment. Construction durable. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAA015⟩. ⟨tel-01705310⟩

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