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• W2051235648 abstract "This paper presents a mathematical model of coupled heat and mass transfer in multi-layers of loose adsorbent grains under realistic conditions of adsorption heat transformation (AHT) cycle. The model allows a simulation of the adsorption dynamics in the adsorbent layer which consists of a low number of loose adsorbent grains (1 ≤ n ≤ 4). Firstly, the model was validated by comparison with the kinetics of isothermal water adsorption on a single spherical grain, initiated by a small pressure drop, for which an analytical solution is well-known. Afterwards, the model was applied to simulate non-isothermal water dynamics for adsorbent-heat exchanger configurations of one, two and four layers of loose grains of Fuji silica type RD. The grains are located on a metal support subjected to a fast variation of temperature as it takes place during isobaric phases of AHT cycle. The system of partial differential equations was solved by using the COMSOL Multiphysics ® simulation environment. The calculated sorption dynamics is in a good accordance with the experimental data obtained for n = 1, 2 and 4 under the same boundary conditions. Moreover, the model was used to simulate the ad/desorption process for different grain sizes (0.45, 0.85 and 1.7 mm). The input parameters which ensure the best data fitting were compared with those experimentally determined for Fuji silica type RD as well as with the input data of other heat and mass transfer models presented in the literature. The developed model gives a powerful tool for accurate simulation of dynamic features for the AHT units with practically interesting configuration of the adsorber/heat exchanger which utilizes a low number of loose adsorbent grains. Moreover, useful information about radial and axial distributions of the temperature and vapour concentration can be obtained for both gas and solid phases. Finally, the specific cooling power of AHT cycle was estimated and recommendations on the cycle dynamic optimization were made. ► We model non-isothermal water sorption for 1, 2 and 4 layers of silica gel grains. ► Calculated sorption dynamics is in accordance with the experimental data. ► We simulated the ad/desorption process for different grain size. ► A grain size 0.5 mm allows a power density higher than that obtained with 1.5–2 mm." @default.
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• W2051235648 date "2012-11-01" @default.
• W2051235648 modified "2023-09-25" @default.
• W2051235648 title "Simulation of water sorption dynamics in adsorption chillers: One, two and four layers of loose silica grains" @default.
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• W2051235648 doi "https://doi.org/10.1016/j.applthermaleng.2012.03.038" @default.
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