Recent advances in humidification dehumidification (HDH) desalination processes: Improved designs and productivity

Giwa, Adewale; Akther, Nawshad; Housani, Amna Al; Haris, Sabeera; Hasan, Shadi W.

doi:10.1016/j.rser.2015.12.108

Cited by 141 publications

(42 citation statements)

References 113 publications

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“…Most of the investigations on solar HDH are concerned about the improvement on productivity and efficiency of the system, which can be made by design and optimization of the HDH cycle and individual element, as well as the optimization of operating conditions, such as the air/water mass flow rate and temperature of feed water and inlet air [47]. Table 2 shows a list of selected solar HDH studies reported in recent years.…”

Section: Direct Solar Desalination--solar Stillmentioning

confidence: 99%

Application of solar energy in water treatment processes: A review

et al. 2018

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The utilization of solar energy to drive water treatment processes is a potential sustainable solution to the world's water scarcity issue. In recent years, significant efforts have been devoted to developing and testing innovative solar based water treatment technologies, which are comprehensively reviewed in this paper. Recent developments and applications of seven major solar desalination technologies, solar photocatalysis process and solar disinfection are investigated. Potential integration of solar technologies and desalination processes are summarized. By collecting and analysing performance data from recent studies, the status of productivity, energy consumption and water production costs of different technologies is critically reviewed. The real world applicability as well as technical and economic feasibility is also evaluated. Presently, most of the solar water treatment processes are still under development with limited real applications. Economic competitiveness is among the major reasons that affect the scaling up and commercialization. It is revealed that the reported water costs of small to medium scale solar desalination plants are in the range of US$0.2-22/m 3 , much higher than conventional fossil fuel based plants. However, the estimated low water costs (US$0.9-2.2/m 3) for large scale solar based plants indicate that solar based alternatives will become potentially viable in the near future.

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Section: Direct Solar Desalination--solar Stillmentioning

confidence: 99%

Application of solar energy in water treatment processes: A review

et al. 2018

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“…Using fossil fuels as the drive power of water desalination increases the problems of energy depletion and air pollution. To solve these problems, small size of HDH water desalination plants derived by renewable energy is currently a hot spot research topic especially in arid areas where sun is available 1 . In the basic HDH system, salt water is evaporated to air‐in‐air humidification process followed by vapor condensation in air dehumidification process to give fresh water.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of solar‐assisted humidification‐dehumidification water desalination system using heat recovery and thermal energy storage system

et al. 2020

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Summary In previous investigations, humidification‐dehumidification (HDH) solar‐assisted desalination systems were designed produce the daily fresh water during sun hours which lead to big sizes and unsteady systems. In the present study, integration of solar‐assisted HDH desalination system with heat recovery and thermal energy storage unit is developed to enhance system productivity, reduces auxiliary power consumptions and system size and assure system continuous operation. The mathematical modelling based on energy and mass conservation equations is presented and solved using iterative techniques by C++ and engineering equation solver software. Detailed parametric study of the developed system is conducted for wide ranges of operating conditions and design parameters to study the effects of integrating the HDH system with solar collectors, heat recovery and thermal energy storage units on the system performance. The results revealed that (i) this integration improves system productivity and reduces operating cost, (ii) increasing air to water mass ratio and sea water temperature and decreasing ambient humidity decrease water productivity and gained output ratio (GOR) and increase operating cost parameter (OCP) and (iii) increasing air inlet temperature and sea water flow rates increase GOR and decrease OCP. Comparison with previous systems showed that the proposed system reduces the electric heating power of the system at solar noon by 37% at MR = 0.5 and gives daily fresh water productivity (123.7 kg/h) two times more than previous systems with comparable OCP (0.099 $/kg).

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“…Humidification and dehumidification (HDH) is an intriguing thermal distillation technique for small-scale and mobile desalination and water treatment applications [6,7] because it can operate under ambient pressure using low-grade and renewable heat sources and handle a wide variety of feed water streams. A HDH unit mimics natural water cycle by first humidifying a carrier gas and then condensing water vapor to produce distilled water.…”

Section: Introductionmentioning

confidence: 99%

A highly effective multi-string humidifier with a low gas stream pressure drop for desalination

Zeng

Sadeghpour

2019

Desalination

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The humidification-dehumidification (HDH) process is appealing for small-scale distributed desalination of highsalinity water. We report a new design of compact lightweight humidifiers with high effectiveness and low electric energy consumption for HDH systems. The new design consists of a dense array of vertically aligned strings, along which thin films of a heated liquid feed are allowed to flow under gravity. A counterflowing gas stream makes direct contact with liquid films carrying the generated water vapor to a dehumidifier. The unique geometric configuration of our design affords high interface-to-volume ratios necessary for high heat/mass exchange effectiveness and straight contiguous gas flow paths for reduced gas-phase pressure drops. We constructed a 0.4 m-tall prototype and examined the effects of the liquid flow rate, air velocity and feed liquid salinity on the heat/mass transfer performance and the gas stream axial pressure drop. Compared with previously reported pad humidifiers and spray columns, the present multi-string humidifier achieves almost 5 times the evaporation rate per humidifier volume at comparable gas stream pressure drops or an order of magnitude reduction in the gas stream pressure drop at comparable total evaporate rates. Our work demonstrates a highlyeffective but compact and lightweight multi-string humidifier with a small gas stream axial pressure drop for HDH and related applications.

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Recent advances in humidification dehumidification (HDH) desalination processes: Improved designs and productivity

Cited by 141 publications

References 113 publications

Application of solar energy in water treatment processes: A review

Application of solar energy in water treatment processes: A review

Augmentation of solar‐assisted humidification‐dehumidification water desalination system using heat recovery and thermal energy storage system

A highly effective multi-string humidifier with a low gas stream pressure drop for desalination

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