Novel ammonia sorbents ‘‘porous matrix modified by active salt” for adsorptive heat transformation: 6. The ways of adsorption dynamics enhancement

The dynamics of ammonia sorption was investigated by means of a Large Temperature Jump (LTJ) method for loose grains of “BaCl2/vermiculite” and “BaCl2/BaBr2/vermiculite” composites which are promising materials for adsorption air-conditioning. The influence of the grain size, the adsorbent composition and the adsorbent load was studied. The heat transfer coefficients were calculated for adsorbents with different grain sizes. The results of LTJ experiments were used for modeling the adsorption air-conditioning cycle operating in the cyclic steady state mode. The potential of using a proper ratio of durations for the adsorption and desorption stages of the cycle along with a harmonization of the driving forces for the enhancement the dynamic performance of the adsorption chiller was discussed. Appropriate recommendations on optimization of the adsorbent composition and load were made.

► Dynamics of NH3 sorption on BaCl2 and BaCl2/BaBr2 in vermiculite matrix was studied.
► Influence of grain size, adsorbent composition and adsorbent load was investigated.
► Heat transfer coefficients were calculated for adsorbents with different grain sizes.
► Harmonization of ad-/desorption times and driving forces enhances AC performance.
► Recommendations on optimization of the adsorbent composition and load were made.