Revisiting the adsorption equilibrium equations of silica-gel/water for adsorption cooling applications

Mohammed, Ramy H.; Mesalhy, Osama; Elsayed, Mohamed L.; Su, Ming; Chow, L. C.

doi:10.1016/j.ijrefrig.2017.10.038

Cited by 64 publications

(21 citation statements)

References 41 publications

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“…The isotherm curves obtained at four different temperatures (293 K, 303 K, 313 K, and 323 K) are nearly linear at moderate pressures from 0.15 to 0.7 and can therefore be described by the Freundlich model and S-B-K model (Supplementary Fig. 26, Supplementary Tables 2 and 3) 30,31 .…”

Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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Aerogel fibers have been recognized as the rising star in the fields of thermal insulation and wearable textiles. Yet, the lack of functionalization in aerogel fibers limits their applications. Herein, we report hygroscopic holey graphene aerogel fibers (LiCl@HGAFs) with integrated functionalities of highly efficient moisture capture, heat allocation, and microwave absorption. LiCl@HGAFs realize the water sorption capacity over 4.15 g g−1, due to the high surface area and high water uptake kinetics. Moreover, the sorbent can be regenerated through both photo-thermal and electro-thermal approaches. Along with the water sorption and desorption, LiCl@HGAFs experience an efficient heat transfer process, with a heat storage capacity of 6.93 kJ g−1. The coefficient of performance in the heating and cooling mode can reach 1.72 and 0.70, respectively. Notably, with the entrapped water, LiCl@HGAFs exhibit broad microwave absorption with a bandwidth of 9.69 GHz, good impedance matching, and a high attenuation constant of 585. In light of these findings, the multifunctional LiCl@HGAFs open an avenue for applications in water harvest, heat allocation, and microwave absorption. This strategy also suggests the possibility to functionalize aerogel fibers towards even broader applications.

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Section: Resultsmentioning

confidence: 99%

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

et al. 2022

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“…The efficiency of the proposed system is highly dependent on the operating parameters to enable the determination of the measuring cycle repeatability and degradation [18,19]. Specific air flow rates are selected to allow effective heat adsorption and delivery from the selected storage material.…”

Section: Specification Of Operating Conditionsmentioning

confidence: 99%

“…The mathematical relations are introduced in order to calculate relevant parameters used for experiments. Two isothermal model concepts, from Dubinin [24] and Freundlich [18,24], were adopted and used to fit the experimental data in order to determine the maximum adsorption of water at high pressures. The Freundlich isotherm is more suited for multilayer adsorption and it also defines the surface heterogeneity and the exponential distribution of the surface-active sites and their energies [24,25].…”

Section: Mathematical Modelsmentioning

confidence: 99%

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The Design and Test for Degradation of Energy Density of a Silica Gel-Based Energy Storage System Using Low Grade Heat for Desorption Phase

Ayisi

Fraňa

2020

Energies

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This paper presents the design and a short cycle repeatability test of a silica gel-based thermal energy storage system using low grade heat for the desorption phase. The system was designed to test the degradation in the energy storage density of the adsorbent material for a 2 h working period in a short number of cycles (5 cycles). Low grade heat of 70 °C is used for regeneration during the desorption phase in each cycle. It was found that a reduction of 1.6 W/kg per each cycle of energy storage was observed, up to 5 cycles. The maximal heat storage density was 292 kJ/kg at the first cycle and reduced to 225 kJ/kg at the fifth cycle. Furthermore, the total amount of water vapor adsorbed in the silica gel was observed as well. The test of energy storage was performed under a short time period (maximal approx. 165 min).

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“…The ADS works mainly on two processes: (i) adsorption-evaporation and (ii) desorptioncondensation. In the first process, the adsorbent adsorbs vapors from the evaporator that is filled by seawater, producing a cooling effect at the evaporator along with desalination at condenser [1][2][3][4][5]. A growing number of studies have been devoted to the field of adsorption desalination systems.…”

Section: Introductionmentioning

confidence: 99%

Duplicating Freshwater Productivity of Adsorption Desalination System Using Aluminum Metal Filings

Alhumade

Askalany

Rezk

et al. 2021

Water

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In this paper, improving the overall heat transfer coefficient by adding aluminum species to silica gel has been studied theoretically. An adsorption desalination system is proposed, and a lumped theoretical model conducted to investigate employing the metal additives within the adsorbent bed with and without a heat recovery between condenser and evaporator. A 30% of the total mass of the adsorbent bed contents was considered to be replaced by aluminum species. According to this, the overall heat transfer coefficient has been increased by 260%, which shows a good impact on the performance of the adsorption system. Daily water productivity was increased by 70% at the worst-case, reaching up to 17 m3/day/ton of silica gel without heat recovery. By employing heat recovery with the metal filing, the daily water productivity reached 42 m3/day/ton of silica gel which is four times the productivity of the classic silica gel-based adsorption desalination system.

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Revisiting the adsorption equilibrium equations of silica-gel/water for adsorption cooling applications

Cited by 64 publications

References 41 publications

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

Hygroscopic holey graphene aerogel fibers enable highly efficient moisture capture, heat allocation and microwave absorption

The Design and Test for Degradation of Energy Density of a Silica Gel-Based Energy Storage System Using Low Grade Heat for Desorption Phase

Duplicating Freshwater Productivity of Adsorption Desalination System Using Aluminum Metal Filings

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