Développement d'un nouveau thermo-transformateur à absorption-démixtion : optimisation conjointe du cycle et du mélange de travail

Abstract : This work is a study of a new type of Absorption-Demixing Heat Transformer (ADHT), using a mixture exhibiting a miscibility gap at low temperature. In this cycle, the separation step is performed by settling obtained after cooling the mixture. The separation is then energetically free and enables to reach thermal yields higher than those obtained for classical absorption heat transformers where separation is done by distillation.In order to find suitable working mixtures to reach temperature lift of 50°C, a numerical simulation tool was developed to calculate ADHT performances. This tool enabled to calculate thermal yield and thermal lift for different values of operating parameters (molar feed ratio, number of stages of rectification column) and different properties of working mixtures (Cp, Lv, parameters characterizing liquid-liquid and liquid-vapour equilibria). The best operating conditions allowed reaching a 12,4°C thermal lift for the n-heptane / DMF mixture takes as a reference mixture. By varying the mixture properties around the values of the reference mixture properties, a maximal thermal lift of 32°C was reached for an imaginary mixture. 17 real mixtures were also studied and enabled to reach a 21°C temperature lift. A list of other working mixtures that should be suitable was established. A 4 kW ADHT pilot unit was designed and built. The technical feasibility of this cycle was then experimentally demonstrated with this unit. A maximum temperature lift of 11°C was measured with the n-heptane / DMF mixture that is lower than the values calculated by simulation
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Halima Noubli. Développement d'un nouveau thermo-transformateur à absorption-démixtion : optimisation conjointe du cycle et du mélange de travail. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL089N⟩. ⟨tel-01748808⟩

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