Abstract: It is well known that non-adsorbable gas, e.g. residual air, can dramatically slow down the adsorption stage of adsorption heat transformation cycles. So far, this effect has been studied for the cycles initiated by temperature change (temperature-initiated cycles). This work addresses the dynamic effect of residual air for another way of adsorption initiation, namely, by changing vapour pressure over adsorbent (pressure-initiated cycle). Comparison of the pressure- and temperature-initiated cycles is also made. The effects are studied for the working pairs “AQSOA FAM-Z02 – water” and “LiCl/(silica gel) – methanol” promising for adsorption heat transformation. The residual partial air pressure ΔPair was varied from 0 to 5 mbar. The main finding of this study is that the pressure-initiated adsorption is less sensitive to the presence of residual air than the temperature-initiated adsorption. This is especially true at a low partial air pressure ΔPair. For instance, at ΔPair ≤ 0.5 mbar, residual air has little or no effect on the pressure-initiated adsorption dynamics compared to the temperature-initiated one. A qualitative explanation of this finding is proposed. Thereby, closed adsorption heat transformation cycles based on the pressure-initiated process are more robust and resistant against the presence of residual air that could be a significant practical advantage.

Cite: Girnik I.S. , Aristov Y.I.
Effect of Residual Air on Dynamics of Temperature- and Pressure-Initiated Adsorption Cycles for Heat Transformation
Applied Thermal Engineering. 2022. V.200. 117629 :1-6. DOI: 10.1016/j.applthermaleng.2021.117629 WOS Scopus РИНЦ AN OpenAlex

Dates:

Submitted:	Jun 15, 2021
Accepted:	Sep 28, 2021
Published online:	Oct 5, 2021
Published print:	Jan 5, 2022

Identifiers:

Web of science:	WOS:000712099900001
Scopus:	2-s2.0-85117274519
Elibrary:	47514603
Chemical Abstracts:	2021:2339845
OpenAlex:	W3203530300

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