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Abstract Abstract： This paper investigated the adsorption/desorption nonequilibrium characteristics of composite MnCl2NH3 working pair by comparing with the Clapeyron reaction equilibrium curve. The experimental results showed that under the same condensation/evaporation conditions, for the sorption/desorption process of MnCl2NH3 the Clapeyron curves for different sorption molar quantities were different, i.e., the process of nonequilibrium sorption/desorption was controlled by dual variables, rather than a single variable. The results were much different from theoretical Clapeyron curves. To verify the results, the isobaric sorption process of sorbent was tested. The results showed that the adsorption process was in accord with the experimental Clapeyron curves, whereas the serious desorption hysteresis existed especially for the sorption quantity of 4 mol mol-1. By considering the results of desorption hysteresis, the coefficient of performance (COP) and specific cooling power (SCP) of the working pair were analyzed. A comparison of the equilibrium theoretical and the experimental nonequilibrium analysis results showed that the error of conventional theoretical results of COP and SCP reached 25% and 40%, respectively, indicating that the performance analysis of chemical sorption refrigeration processes should be based on the nonequilibrium sorption performance test.
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Received: 28 March 2015
Published: 28 April 2016
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