An enhanced adsorption cycle operated by periodic reversal forced convection

Abstract A different cycle configuration is suggested in this work. Interesting improvement in performances is envisaged by applying the fixed bed adsorbers with the forced unsteady-state operation of periodic flow reversal to convective thermal wave cycle, which results in the so-called Periodic Reversal Forced Convective cycle. To describe process behavior for this kind of cycle with seven possible operating modes of flow reversal, a two-phase, one-dimensional model for the zeolite 13X-water pair is developed. Some important phenomena, such as the heat pipe effect, internal and external thermal regeneration etc., are discussed. The results of numerical simulations show that among all possible operating modes of flow reversal, only the mode of CCAA (switching the flow directions each phase duration) could improve the global performances of non-reversed flow operation, but others could not. Under the current conditions of cycle, the proposed CCAA cycle with heat exchanger regenerator could offer significant improvements in coefficient of performance (COP) over both the conventional cycle without flow reversal operation and existing convective thermal wave cycle with inert packed bed regenerator. The results of calculation also show that more than 1.7 of COPh, 0.9 of COPc and 125 W/kg adsorbent of specific cooling power (SCP) within this system could be possible. Analysis gives satisfactory explanation of these results.

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