Innovative employing of salt hydration with adsorption to enhance performance of desalination and heat transformation systems

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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“…Equilibrium water uptake The D-A model for water adsorption onto silica gel, adsorption isotherms [15].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The highest SDWP achieved employing silica gel was 6.76 m 3 /ton per day. Ali et al [15] presented an innovative merge between ADS and salt hydrate water desalination system. The system achieved an SDWP of 40 m 3 /ton of silica gel per day at 95 • C driving temperature.…”

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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“…Day as stated in Reference 17. Ali et al 18 presented the combination of adsorption and salt hydrate desalination systems in a three‐bed configuration. Recent papers illustrate adsorption materials and adsorption cooling system configurations and their combination with other cooling and desalination systems 19‐21 .…”

Section: Introductionmentioning

confidence: 99%

“…Day as stated in Reference 17. Ali et al 18 presented the combination of adsorption and salt hydrate desalination systems in a three-bed configuration. Recent papers illustrate adsorption materials F I G U R E 1 Adsorption systems: (A) adsorption desalinationcooling, (B) adsorption desalination with heat recovery (condenser/ evaporator), (C) adsorption cooling system and adsorption cooling system configurations and their combination with other cooling and desalination systems.…”

Section: Introductionmentioning

confidence: 99%

Composite adsorbent materials for desalination and cooling applications: A state of the art

Alsaman

Ibrahim

Ahmed

et al. 2022

Intl J of Energy Research

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Summary Adsorption technology is very attractive for producing desalinated water and cooling with no harmful impact on the environment. The performance of adsorption water applications (desalination and cooling) depends on the adsorption characteristics. Many adsorption systems designs were investigated worldwide, employing different adsorbent materials to develop a cost‐effective and high‐performance system. This review presents and summarizes the studies in adsorption and the corresponding applications in desalination and cooling and compares the adsorption properties of composite adsorbents. The review focuses on the composite materials and how they were synthesized while comparing them in terms of the amount of adsorption. The reviewed materials have been classified according to the basic host, such as silica gel, zeolite, carbon, metal‐organic frameworks (MOF), and vermiculite. The review contains more than 70 composites. The maximum reached water vapor uptake is 1.92 kg/kg of PHTS/CaCl2‐20 wt% composite at 0.9 P/Ps. The highest available desorption amount is 1.48 kg/kg of MOF composite for desalination applications and 0.87 kg/kg of vermiculite composite for cooling applications.

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“…Many adsorption isotherm models have been implemented to describe the adsorption characteristics of adsorbents. Among them, conventional models of adsorption isotherms, such as Langmuir, Sips, Toth, and Dubinin–Astakhov, have been widely used owing to their simplicity. − However, these isotherms can only be applied over a limited pressure range because of the potential for significant discrepancies in the predictions of abnormal adsorption isotherms under certain operating conditions (e.g., in the presence of polar or nonpolar adsorbates) …”

Section: Introductionmentioning

confidence: 99%

Adsorption Isotherm Model for Analyzing the Adsorption Characteristics of Water Vapor to Commercially Available Silica Gel Adsorbents for Adsorption Desalination Applications

Woo

Lee²,

Ji³

et al. 2021

J. Chem. Eng. Data

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In adsorption desalination applications, adsorption isotherms are considered to be a crucial factor, significantly impacting performance. From this perspective, a number of isotherm models have been implemented to describe the adsorption characteristics of an adsorbent. However, conventional isotherm models can produce significant discrepancies in predictions of anomalous adsorption isotherms under specific operating conditions (e.g., in the presence of polar or nonpolar adsorbates). In this study, a hybrid isotherm model consisting of Langmuir and Sips isotherms was proposed. With this model, optimal compatibility is demonstrated with the adsorption isotherms of four different commercial silica gels. First, the thermophysical properties of silica gel were analyzed using nitrogen adsorption and desorption isotherms at 77 K; then, adsorption isotherms of water vapor were evaluated. The results of the hybrid isotherm model were compared with those of the conventional isotherm models (i.e., Toth and Dubinin−Astakhov) at relative pressures ranging from 0 to 0.9 at temperatures ranging from 30 to 70 °C. The hybrid isotherm model demonstrated good agreement with the adsorption data measured for all silica gels. The coefficient of determination for the hybrid isotherm model was found to be higher than 0.99 for all silica gels, unlike the coefficients for the conventional isotherm models. The hybrid isotherm model also exhibited the lowest average relative error and maximum relative error.

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Innovative employing of salt hydration with adsorption to enhance performance of desalination and heat transformation systems

Cited by 25 publications

References 28 publications

Duplicating Freshwater Productivity of Adsorption Desalination System Using Aluminum Metal Filings

Duplicating Freshwater Productivity of Adsorption Desalination System Using Aluminum Metal Filings

Composite adsorbent materials for desalination and cooling applications: A state of the art

Adsorption Isotherm Model for Analyzing the Adsorption Characteristics of Water Vapor to Commercially Available Silica Gel Adsorbents for Adsorption Desalination Applications

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