Transient theoretical model for the assessment of three heat exchanger designs in a large-scale salt gradient solar pond: Energy and exergy analysis

Mansouri, A. El; Hasnaoui, M.; Amahmid, A.; Dahani, Youssef

doi:10.1016/j.enconman.2018.04.087

Cited by 20 publications

(5 citation statements)

References 46 publications

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“…The last zone is the LCZ, which is at the bottom of the pond. The saturated brine in the LCZ can absorb and store solar radiation to heat buildings or provide a hot feed for the MD process [ 103 , 104 ]. SGSPs have been widely researched due to their low cost and ability to store solar radiation for a long time [ 105 ].…”

Section: Renewable Energy and Waste Heat Coupled With MDmentioning

confidence: 99%

Review of Hybrid Membrane Distillation Systems

Zhang,

Xian

2024

Membranes

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Membrane distillation (MD) is an attractive separation process that can work with heat sources with low temperature differences and is less sensitive to concentration polarization and membrane fouling than other pressure-driven membrane separation processes, thus allowing it to use low-grade thermal energy, which is helpful to decrease the consumption of energy, treat concentrated solutions, and improve water recovery rate. This paper provides a review of the integration of MD with waste heat and renewable energy, such as solar radiation, salt-gradient solar ponds, and geothermal energy, for desalination. In addition, MD hybrids with pressure-retarded osmosis (PRO), multi-effect distillation (MED), reverse osmosis (RO), crystallization, forward osmosis (FO), and bioreactors to dispose of concentrated solutions are also comprehensively summarized. A critical analysis of the hybrid MD systems will be helpful for the research and development of MD technology and will promote its application. Eventually, a possible research direction for MD is suggested.

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Section: Renewable Energy and Waste Heat Coupled With MDmentioning

confidence: 99%

Review of Hybrid Membrane Distillation Systems

Zhang,

Xian

2024

Membranes

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“…In this zone, thermal energy is stored as sensible heat and can be extracted via a heat exchanger that is conventionally placed in the LCZ [5], [6]. Nevertheless, El Mansouri et al [7] demonstrated that extracting heat using horizontal and vertical tubes in LCZ and NCZ, respectively, provides better energy and exergy efficiency. In 2017, the El Mansouri et al study [8] was the first SGSP study conducted by Moroccan researches.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the energy stored in the NCZ and LCZ reaches, at the end of the simulation period (5 days), 5.9 kWh and 11.3 kWh respectively. Following the El Mansouri et al studies [7]- [9], Rghif et al [4], [10]- [12] focused on Soret effect (the mass transfer caused by the temperature gradient) and Dufour effect (the heat transfer caused by the salt concentration gradient) developed in SGSPs under meteorological conditions of Tangier city in Morocco. To this end, a 2D numerical model was developed in Fortran 95 basing on Navier-Stokes, thermal energy and diffusion equations.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of solar energy storage by a salt gradient solar pond in several Moroccan cities

2022

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Numerical investigation of solar energy storage by a Salt Gradient Solar Pond (SGSP) in several Moroccan cities (Marrakesh, Ouarzazate, Tangier and Ifrane) is presented in this paper. For this purpose, the SGSP considered is assimilated to an open parallelipedic cavity in which the vertical and bottom walls are thermally insulated. The one-dimensional numerical model developed in Python programming language is based on the energy balance of each SGSP zone in which the heat losses via the SGSP free surface are retained. The numerical results obtained from the model developed are satisfactorily compared and validated against those obtained experimentally and numerically from a literature study. According to the results of one year of the SGSP operation, the storage zone temperature and the energy stored in the SGSP located in Ouarzazate city are the highest and reach maximum values in July (about 128 °C and 146 MJ respectively). Moreover, comparisons between different mass flow rates (0.01 Kg/s, 0.05 Kg/s and 0.09 Kg/s) of heat exchanger placed in the storage zone show that the optimal one is 0.09 Kg/s as it ensures the maximum energy extraction.

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“…Salinity gradient solar ponds (SGSPs) have been widely constructed and have been the focus of considerable investigation [1][2][3][4][5][6]. It is a simple and inexpensive technology that can provide thermal energy throughout the year-even in winter-particularly for industries and uses that require only a temperature below 100°C to function [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Efficiency of Salinity Gradient Solar Pond by Suppressing Surface Evaporation Using an Air Layer

Sayer¹,

Mahood²

2020

Energy Engineering

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Salinity gradient solar ponds (SGSPs) provide a tremendous way to collect and store solar radiation as thermal energy, and can help meet the critical need for sustainable ways of producing fresh water. However, surface evaporation results in the loss of both water and heat. This study therefore theoretically investigates the effect on temperatures within an SGSP when its surface is covered with a layer of air encased in a nylon bag. An earlier SGSP model was slightly modified to add the air layer and to estimate the temperature distributions of the upper layer or the upper convective zone (UCZ) and the bottom layer or lower convective zone (LCZ). The results for a year-long period showed that adding the air cover increased the LCZ temperature to a maximum of 94°C in July, with a total average increase of about 9% over the uncovered pond. In the UCZ, temperatures showed an average increase of approximately 45%, reaching a maximum of 34°C. The temperature of the air layer was meanwhile found to be close to the ambient temperature and behaved identically. These findings invite future experimental and theoretical investigations into the use of air layers to prevent surface evaporation, thereby enhancing the efficiency of SGSPs as a source of clean energy.

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Transient theoretical model for the assessment of three heat exchanger designs in a large-scale salt gradient solar pond: Energy and exergy analysis

Cited by 20 publications

References 46 publications

Review of Hybrid Membrane Distillation Systems

Review of Hybrid Membrane Distillation Systems

Numerical investigation of solar energy storage by a salt gradient solar pond in several Moroccan cities

Improved Thermal Efficiency of Salinity Gradient Solar Pond by Suppressing Surface Evaporation Using an Air Layer

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