Design strategies of conventional and modified closed-air open-water humidification dehumidification systems

Elmutasim, Samih M.; Ahmed, M.A.; Antar, Mohamed A.; Gandhidasan, P.; Zubair, Syed M.

doi:10.1016/j.desal.2017.11.011

Cited by 37 publications

(3 citation statements)

References 12 publications

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“…The cost of additional brine management and treatment, which can make up between 5 and 33% of the overall desalination cost, is decreased by having a desalination system with a lower brine outflow. On the other hand, brine disposal into the ocean or into waterways that are related to the ocean can have serious negative effects on the environment (Elmutasim et al 2018 ). It may result in several issues for both the sea environment and the subsurface habitat.…”

Section: Introductionmentioning

confidence: 99%

Salinity impacts on humidification dehumidification (HDH) desalination systems: review

Nabil,

Abdalla,

Mansour

et al. 2023

Environ Sci Pollut Res

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The use of humidification-dehumidification water desalination technology has been shown to be a practical means of meeting the demand for freshwater. The aim of this review is to investigate the impact of salinity on HDH techniques that have various benefits in terms of both economics and the environment, including the capacity to operate at low temperatures, utilize sustainable energy sources, the need for low maintenance, and straightforward construction requirements. Also, in this review, it is observed that the HDH system’s components are strong and capable of treating severely salinized water. It can treat water in an appropriate way than other desalination technologies. This technology has recently been commercialized to treat highly salinized generated water. However, more research is needed to determine how salinity affects HDH productivity. According to several research investigations, while the specific thermal energy consumption increased considerably and the productivity of water per unit of time decreased significantly as the salt mass percentage grew, the purity of clean water did not suffer. The rejected brine must be reduced by increasing the total water recovery ratio in the HDH system. Through this review, it was found that brine control is becoming increasingly important in the water processing industry. ZLD systems, which aim to recover both freshwater and solid salts, can be a viable replacement for disposal methods. Finally, through this reviewer, it was concluded that HDH desalination systems may operate with extremely saline water while increasing salinity has a significant influence on system performance.

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Section: Introductionmentioning

confidence: 99%

Salinity impacts on humidification dehumidification (HDH) desalination systems: review

Nabil,

Abdalla,

Mansour

et al. 2023

Environ Sci Pollut Res

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“…Several configurations have been investigated and reviewed by Müller-Holst et al and by Narayan et al Such studies indicated closed-air, open-water (CAOW), water-heated processes were the most energy-efficient solution because of the high heat capacity of water and the possibility of working with saturated air. A review of the design strategies currently adopted for CAOW processes was recently presented by Elmutasim et al …”

Section: Introductionmentioning

confidence: 99%

“…Several configurations have been investigated and reviewed by Muller-Holst et al 5 and by Narayan et al 2 Such studies indicated closed-air, open-water (CAOW), water-heated processes were the most energy-efficient solution because of the high heat capacity of water and the possibility of working with saturated air. A review of the design strategies currently adopted for CAOW processes was recently presented by Elmutasim et al 6 A schematic of the HDH system considered in this work, featuring a single-stage CAOW configuration and photovoltaic− thermal solar panels (PVT) as the energy source, is shown in Figure 1. The inlet saline water stream enters the dehumidifier, where it cools down the stream of hot saturated air causing some of the water vapor to condense and thus yielding a stream of clean water.…”

Section: Introductionmentioning

confidence: 99%

Solar-Driven Humidification–Dehumidification Process for Water Desalination Analyzed and Optimized via Equilibrium Theory

Gabrielli

Mazzotti

2019

Ind. Eng. Chem. Res.

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This study investigates a desalination system based on a humidification–dehumidification process driven by solar modules and proposes a solution within the framework of equilibrium theory. Although the optimal operation of the considered humidification–dehumidification system has been investigated in the past and despite the simplifications and assumptions characterizing equilibrium theory, the proposed solution provides a thorough understanding of the system operation, which has not been obtained yet. First, it allows an explanation of the asymmetry between the humidifier and the dehumidifier, which results not from mass transport limitations but from the functional dependence of the enthalpy of moist air on temperature, which in turn depends on the functional dependence of the saturation pressure of air. On the one hand, humidifying air becomes easier when the temperature increases, leading to simple wave interactions, to the corresponding smooth transitions, and to greater entropy generation in the humidifier. On the other hand, dehumidifying air becomes more difficult when the temperature decreases, leading to shock interactions, to the corresponding sharp transitions, and to smaller entropy generation in the dehumidifier. Then, it allows description of the behavior of the overall system (i.e., considering the solar modules connecting the dehumidifier and humidifier). Optimal system operation is defined by determining the air-to-water mass flow rate ratio that maximizes the productivity of fresh water for any value of ambient conditions and saline water inlet temperature. Such a maximum productivity curve separates low-productivity and high-productivity regions, with a discontinuity causing a sudden drop in productivity occurring when going from the latter to the former. Such a discontinuity is well explained by equilibrium theory in terms of the operating regimes of the humidifier and dehumidifier. Finally, equilibrium theory is used to derive an analytical approximation of the optimal operating curve. Such an analytical form describes well the actual solution, particularly within the boundary conditions of interest, and provides an immediate tool for easily determining the optimal system operation.

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Effect of nanofluid on the performance of humidification-dehumidification (HDH) desalination system

Shouman,

Fadel,

Samad

et al. 2024

Heat Mass Transfer

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Design strategies of conventional and modified closed-air open-water humidification dehumidification systems

Cited by 37 publications

References 12 publications

Salinity impacts on humidification dehumidification (HDH) desalination systems: review

Salinity impacts on humidification dehumidification (HDH) desalination systems: review

Solar-Driven Humidification–Dehumidification Process for Water Desalination Analyzed and Optimized via Equilibrium Theory

Effect of nanofluid on the performance of humidification-dehumidification (HDH) desalination system

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