Abstract: Adsorbent – heat exchanger (Ad-HEx) unit is a core of adsorptive heat transformation and storage (AHTS) systems as it largely determines their efficiency and power. Commercial gas-to-liquid HExs with finned flat-tube (FFT) geometry are often used in AHTS units, which are available on the market and tested in the labs. This communication addresses the problem of how to rationally select the optimal HEx among plenty of units offered on the market. The choice is often based on what is “at hand”, on intuition or common sense rather than on the rational achievements of the thermal science. This communication addresses the first experimental validation of the applicability of the fin efficiency concept, earlier developed for gas-to-liquid FFT HExs, for adsorbent-to-liquid Ad-HExs used for AHTS, when fins transfer heat to the fixed adsorbent bed instead of the moving gas. The procedure is based on measuring the overall thermal conductance for three commercial FFT HExs with quite different geometric parameters. The measurements are performed under typical AHTS conditions by a Large Temperature Jump method. Composite LiCl/(silica gel) promising for adsorptive heat storage and air conditioning is used as a solid sorbent. The measured thermal conductance appears to be close to the conductance calculated according to the idealized procedure earlier developed for gas-to-liquid FFT HExs. Then, the geometrical and thermal parameters are analyzed for sixteen commercial FFT HExs, both described in the AHTS literature and selected among common automobile radiators. A linear relation between the HEx thermal conductance and the ratio (S/mad) = (area of heat transfer surface)/(adsorbent mass) is found, which greatly simplifies the prediction of the HEx thermal behaviour. This approach can be recommended as an accurate and time-saving strategy for selecting commercial HExs and designing new HExs optimal for adsorption heat transformation and storage.

Cite: Grekova A.D. , Tokarev M.M. , Aristov Y.I.
On the Use of Finned Flat-Tube Heat Exchangers for Adsorptive Heat Storage and Transformation
Journal of Energy Storage. 2024. V.84. NPart B. 110973 :1-12. DOI: 10.1016/j.est.2024.110973 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Apr 6, 2023
Accepted:	Feb 13, 2024
Published online:	Feb 17, 2024
Published print:	Apr 20, 2024

Identifiers:

Web of science:	WOS:001199236200001
Scopus:	2-s2.0-85185326276
Elibrary:	66166808
OpenAlex:	W4391914469

Citing:

DB	Citing
OpenAlex	3
Scopus	3
Web of science	3
Elibrary	2

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