Performance improvement of adsorption desalination system by applying mass and heat recovery processes

Amirfakhraei, Amirhossein; Zarei, Taleb; Khorshidi, Jamshid

doi:10.1016/j.tsep.2020.100516

Cited by 24 publications

(12 citation statements)

References 45 publications

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“…The water demand is increasing in both industrial and domestic sections and at some point, it will be higher than the agriculture demand as reported in [1], [2], [3] and [4]. Desalination is one of the most important solutions for water supply as it is a reliable technology that was improved over decades to overcome fresh-water shortage by processing seawater in different ways and convert it into freshwater.…”

Section: Introductionmentioning

confidence: 99%

Exergy and parametric analysis of freeze desalination with reversed vapor compression cycle

Elrahman

Abdo

Hussein

et al. 2020

Thermal Science and Engineering Progress

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Freezing desalination is one of the recent technologies that tries to contribute in water shortage problems. The idea of desalination by freezing is quite new and still needs more deep investigation for better understanding and proposing new enhancements in the system's technology. This paper aims to present exergy and parametric analysis for different operational parameters of a small-scale desalination by freezing unit working on a reversed vapor compression cycle. Operating parameters including freezing ratio, temperature and salt concentration are investigated. These parameters variations are critical to determine the working design parameters effects on the overall cycle performance. Salinity range from 5000 to 45000 ppm was tested using a heat pump of a C.O.P range from 3.8 to 8.2. Results showed that the energy consumption for this system range was 14.5 and 68.7, kWh per meter cube water production at 5000 and 45000 ppm, respectively. Exergy analysis showed that recovering larger quantities of the expelled brine is more efficient and useful due to more contributions in increasing the energy efficiency of the operating cycle. The proposed system proved to give higher thermal efficiency compared to alternative desalination systems such as reverse osmosis with membranes or flash systems. The system recorded a high thermal efficiency of 44% at 25 ̊ C and 50% icing ratio. The output results from the system analysis given in this paper could significantly help to implement an actual optimized desalination system working on a reversed vapor compression cycle.

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Section: Introductionmentioning

confidence: 99%

Exergy and parametric analysis of freeze desalination with reversed vapor compression cycle

Elrahman

Abdo

Hussein

et al. 2020

Thermal Science and Engineering Progress

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“…Drinking water consumption is widely increasing. The reason for this is population growth and increased industrial, agricultural, and economic activities (Zubair et al 2018;Amirfakhraei et al 2020). The United Nations estimates that by 2025, about 1,800 million people worldwide will face severe water shortages (Amirfakhraei et al 2021a).…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of an HDH desalination system using direct contact packed towers: experimental and mathematical modeling study

Zarei

Miroliaei

2022

Journal of Water Reuse and Desalination

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Humidification–dehumidification desalination (HDH) is one of the suitable methods for desalination of saline and brackish water in a small scale. In this research, a HDH desalination method with a direct contact dehumidifier has been analyzed theoretically and experimentally. The setup consists of two similar packing towers for humidification and dehumidification, 10 inches in diameter, which are filled up to 1 m with Rushing packing. In this new HDH configuration, seawater and freshwater recirculation has been used in humidifier and dehumidifier sections, respectively. A steady-state mathematical model based on the mass and energy equations for each system component is presented. The effect of various input parameters on the freshwater production, gain output ratio (GOR) and specific energy consumption has been investigated. The results revealed that the inlet seawater and air temperature to the humidification tower had the highest and the lowest effect on the produced freshwater, respectively. Also, the maximum value of the GOR is 3.3, which is obtained in the equilibrium condition of the dehumidifier. The experiments show that the freshwater production of the proposed HDH device is 300 L/day, which can provide water for domestic consumption of a small family.

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“…The symbols indicate the measured isotherm data, and the solid and dashed lines indicate the predicted isotherm data obtained by Langmuir, Sips, Dubinin–Astakhov, and Toth isotherm models, respectively. In the case of the AD system, modeling the adsorption isotherm is a key factor for the design and prediction of the AD system, as performance depends only on the adsorption isotherm (i.e., the adsorption and desorption behavior of the adsorbent–adsorbate pair). , Meanwhile, recent studies have focused on improving performance by shifting the operating pressure of adsorption and desorption processes through new schemes (e.g., heat and mass recovery), configurations (e.g., three-bed two-evaporator adsorption cycle), and hybrid processes (e.g., MED-AD, VMD-AD, and HDH-AD system). − Hence, the accuracy of the adsorption isotherm model over a wide range of relative pressure is very important. Many adsorption isotherm models have been implemented to describe the adsorption characteristics of adsorbents.…”

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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Performance improvement of adsorption desalination system by applying mass and heat recovery processes

Cited by 24 publications

References 45 publications

Exergy and parametric analysis of freeze desalination with reversed vapor compression cycle

Exergy and parametric analysis of freeze desalination with reversed vapor compression cycle

Performance evaluation of an HDH desalination system using direct contact packed towers: experimental and mathematical modeling study

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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