Abstract
Adsorption processes are widely used to convert heat with low- or even ultralow-temperature (ULT) potential. For instance, the adsorptive VentireG process was proposed to regenerate ULT heat and moisture in ventilation systems in cold countries. In this paper, a new approach for a deeper analysis of this process is proposed. It is implemented by plotting water adsorption isosters for a specific adsorbent directly on the common psychrometric chart of humid air. Such a combined diagram would allow the states of air and the given adsorbent to be tracked simultaneously.The merged “psychrometric – isosteric” diagram is plotted for five adsorbents potentially promising for the VentireG process. Their possible application in typical climatic zones of cold countries is analyzed, and the conscious choice of proper adsorbents is made. Composites “salt (CaCl2, LiCl, LiBr) in silica pores” can exchange up to 0.4–0.5 g_H2O/g and ensure low dew point of the outlet air.In a broader sense, this new combined diagram can be used for analyzing any open adsorption cycles, e.g., for air conditioning, desiccation, water harvesting from the atmosphere, etc.
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