Szczegóły publikacji
Opis bibliograficzny
High-performance silica gel composites with metal salt impregnation for adsorption chillers: experimental findings and theoretical modelling / Agata MLONKA-MĘDRALA, Wojciech KALAWA, Tomasz BUJOK, Piotr BORUTA, Karol SZTEKLER, Łukasz MIKA, Wojciech NOWAK // Applied Thermal Engineering ; ISSN 1359-4311. — 2025 — vol. 276 art. no. 126939, s. 1–12. — Bibliogr. s. 11–12, Abstr. — Publikacja dostępna online od: 2025-05-24
Autorzy (7)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 160398 |
|---|---|
| Data dodania do BaDAP | 2025-06-30 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.applthermaleng.2025.126939 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Applied Thermal Engineering |
Abstract
This study explores the adsorption properties of silica gel and its composites wet-impregnated with inorganic salts (LiCl, CaCl2, and LiNO3) for use in adsorption chillers. Characterisation of the adsorption properties was performed using low-temperature gas adsorption, and dynamic vapour adsorption measurements with water vapour. Although a wide porous silica gel achieves a water vapour adsorption of about 40 %, salt-impregnated composites exhibit up to four times higher adsorption capacity, attributed to chemical adsorption by salts. However, this improvement is accompanied by reduced active surface area and pore volume due to salt deposition, but also development of microporous structure. The improvement in adsorption properties is due to chemical adsorption by the salts after impregnation, but the adsorption cycle is relatively long, with full water adsorption requiring more than 30 min. A laser flash method was used to determine the thermal conductivity coefficient, the silica gel + LiCl composite showed a thermal conductivity coefficient 66.2 % higher than the base material. A numerical model based on Dubinin–Astakhov and Linear Driving Force kinetics showed reliable predictions, with adsorption errors under 3 % for SG + LiCl. The desorption modelling was less accurate, reflecting the material inhomogeneity from salt impregnation. Theoretical analysis revealed potential increases in the coefficient of performance (COP) and specific cooling power (SCP) by 23 % and 950 %, respectively, supporting smaller chiller designs. These findings highlight the promise of salt-impregnated silica gels for advanced adsorption cooling systems.
