By Victoria M. Petrova
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Rezk, A. Mahmoud et al. Alternatively, it is possible to coat the first layer of adsorbent granules to the bed and pack the remaining. Rezk et al. 2012 predicted the effect of such technique on the performance of silica gel packed in a rectangular finned adsorber bed. It is observed that a significant average enhancement of the adsorbent bed heat transfer performance of 28%, as shown in Figure 18. 4. Consolidated Adsorbent Bed Consolidated adsorbent bed reactors using (compressed granules and clay, using expandable graphite, moulding granules and binder addition and metal foam impregnated with adsorbent granules) have the advantage of high heat transfer performance.
Adsorbent material classification. 1. Physical Adsorbents Physical adsorbents are usually porous materials with different pore size; Figure 11 shows the classification of such adsorbents based on the pore size. Such adsorbents adsorb the refrigerant by intermolecular force ―Van der Waals force‖ and retain their original properties during the adsorption and desorption processes. This advantage makes the physical adsorbent the most commonly used in practical application. However, most of the physical adsorbents suffer from low adsorption kinetics and hence low cyclic refrigerant flow rate.
Figure 16 shows the effect of adding various metal particles on the heat transfer performance of rectangular finned tube silica gel adsorber bed. It is clear from this figure that the addition of metal particles improves the heat transfer performance (NTU Cooling and NTU Heating). 3. Coating the Heat Exchanger by the Adsorbent Material Generally, thermal contact resistance between adsorbent granules and heat exchanger metal surface contributes an average of 25% to the overall heat transfer resistance.