Abstract
This article presents a study of the effect of metal particle and carbon nanotube additives on the thermal diffusivity of a silica-gel-based adsorption bed of an adsorption chiller. The structural properties of silica gel and carbon nanotubes were investigated using the volumetric method of low-pressure nitrogen adsorption. Thermal characteristic tests of the prepared mixtures based on a silica gel with 5 wt% and 15 wt% of aluminum, copper, or carbon nanotubes were carried out. The obtained results show that all the materials used as additives in blends in this study achieved higher thermal diffusivities in comparison with the thermal diffusivity of the parent silica gel. However, the best effect was observed for the mixture with 15 wt% aluminum.
Highlights
The planet’s ecological situation has long been forcing humanity to seek new, greener energy sources and industrial solutions
low-pressure nitrogen adsorption (LPNA) measurements consisted of filling the pore volume of the tested materials with adsorbate particles (N2 ) due to the interactions occurring at the solid–gas interface under vacuum
According to the manufacturer's data, the metals used in the study were of Materials were delivered by the manufacturers and mixed as powders after weighing
Summary
The planet’s ecological situation has long been forcing humanity to seek new, greener energy sources and industrial solutions. Numerous branches of industry generate vast amounts of waste heat, which is not being used efficiently. One of the prospective solutions to this issue is adsorption cooling technology that can be powered using industrial waste heat [1,2,3,4,5,6] or renewable sources of energy. The cooling capacity of the adsorption aggregate is obtained using thermal processes that take place during adsorption and desorption on porous media; the improvement of these phenomena is currently one of the most critical research challenges as adsorption chillers achieve lower coefficients of performance (COPs) in comparison to conventional compressor refrigerators. Since the main reason for the low COPs is the low thermal diffusivities of Energies 2020, 13, 1391; doi:10.3390/en13061391 www.mdpi.com/journal/energies
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