Abstract :
[en] In this study, three-dimensional numerical models of cylindrical adsorber were developed for vertical and horizontal fins. This adsorber contains fins filled with two traditional adsorbents (Zeolite and Silica gel) and a new adsorbent (NH2-MIL125). The height of the adsorber is adjusted to have the same amount of the adsorbent for the different number of fins and adsorber design. The discretization of the coupled equations in the system is done by the finite volume method (FVM). The effect of the number and geometry of fins on the desorption kinetic and the specific cooling capacity are investigated for each one. The results showed that NH2-MIL125 gives the best coefficient of performance (COP) and the highest Specific Cooling Power (SCP) comparing to the traditional adsorbents. For the vertical fins, results showed a low impact of the fins number and design of the different adsorbents (Zeolite, silica and NH2-MIL125). This low impact is due to the configuration of the adsorbent bed. The factor form F is found to be correlated to the time cycle and the heat transfer. F has an optimal value of 0.4 when the number of fins is 15. The coefficient of performance (COP) shown to be independent from the fins number. The Specific Cooling Power (SCP) is affected by the fins number of the three adsorbents. NH2-MIL125 is giving the best result of SCP reaching a value of 80 Wh/kg. Considering the obtained results, the NH2-MIL125 is a promising adsorbent for the adsorption cooling system.
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