Pore structure control of anodized alumina film and sorption properties of water vapor on CaCl2-aluminum composites

Suppanat Chumnanwat, Yuto Watanabe, Naoko Taniguchi, Hidenori Higashi, Akio Kodama, Takafumi Seto, Yoshio Otani and Mikio Kumita

Energy, 2020, vol. 208, issue C

Abstract: Recently, increasing research attention has been given to the development of an absorber to enhance the coefficient of performance (COP) and the capacity of an adsorption heat pump by improving the sorbent in the sorption chamber or reactor. This study introduces the preparation method for an efficient adsorbent with a high thermal conductivity. Three types of host matrix aluminum composite sorbents were prepared through anodizing and pore widening treatment (PWT). This created an aluminum oxide film that was 92 μm thick with a mean pore diameter of 76 nm on an aluminum plate. To improve the sorption ability, the anodized aluminum was impregnated with calcium chloride. The sorption isotherm of the aluminum composite demonstrated its ability to uptake 7.5 mol-H2O/mol-CaCl2 water at a relative pressure of 0.33 at 30 °C. A numerical method was used to predict water sorption and temperature distribution in the aluminum composite layer via a heat and mass transfer model. The specific cooling power (SCP) was used to indicate the cooling performance of a sorption heat pump that employed the aluminum composite as laminate sorbent fins by varying the spacing between each fin.

Keywords: Sorption cooling; Anodized alumina film; Calcium chloride; Composite sorbent; Mathematical modeling (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:208:y:2020:i:c:s0360544220314778

DOI: 10.1016/j.energy.2020.118370

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