Solar desalination with a humidification-dehumidification cycle: mathematical modeling of the unit

Farid, Mohammed; Parekh, Sandeep; Selman, J. R.; Al‐Hallaj, Said

doi:10.1016/s0011-9164(02)00994-3

Cited by 70 publications

(23 citation statements)

References 9 publications

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“…Others used finned tube heat exchangers ( [16], [18] & [50]). A long tube with longitudinal fins was used in one study [59], while a stack of plates with copper tubes mounted on them in another study ([60] & [61]) used a horizontal falling film-type condenser. Direct contact heat exchangers were also used as a condenser in some other studies [62] seawater as a coolant wherein the water is heated by the humid air before it is pumped to the humidifiers.…”

Section: Dehumidifiersmentioning

confidence: 99%

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

Narayan

Sharqawy

Summers

et al. 2010

Renewable and Sustainable Energy Reviews

368

132

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World-wide water scarcity, especially in the developing world, indicates a pressing need to develop inexpensive, decentralized small-scale desalination technologies which use renewable resources of energy. This paper provides a comprehensive review of the stateof-the-art in one of the most promising of these technologies, solar-driven humidification-dehumidification (HDH) desalination. Previous studies have investigated many different variations on the HDH cycle. In this paper, performance parameters which enable comparison of the various versions of the HDH cycle have been defined and evaluated. To better compare these cycles, each has been represented in psychometric coordinates. The principal components of the HDH system are also reviewed and compared, including the humidifier, solar heaters, and dehumidifiers. Particular attention is given to solar air heaters, for which design data is limited; and direct air heating is compared to direct water heating in the cycle assessments. Alternative processes based on the HDH concept are also reviewed and compared. Further, novel proposals for improvement of the HDH cycle are outlined. It is concluded that HDH technology has great promise for decentralized small-scale water production applications, although additional research and development is needed for improving system efficiency and reducing capital cost.

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Section: Dehumidifiersmentioning

confidence: 99%

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

Narayan

Sharqawy

Summers

et al. 2010

Renewable and Sustainable Energy Reviews

368

132

View full text Add to dashboard Cite

show abstract

“…The study reported the vapor content difference in air was approximately 110 g w /kg a at 60 • C [4], 138 g w /kg a at 60 • C [6], and 138 g w /kg a at 60 • C [7] after the 8th, 15th, 4th heating humidifying stages respectively. In addition, mathematical modeling and computer simulation studies of solar desalination units are based on the humidification-dehumidification process [9][10][11][12][13][14]. These studies focused on studying and analyzing the effects and performance of various components involved in the process.…”

Section: Introductionmentioning

confidence: 99%

Desalination based on humidification–dehumidification by air bubbles passing through brackish water

El-Agouz

2010

Chemical Engineering Journal

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“…Al-Hallaj et al [2] reported on a multiple-effect humidification process where the HDH process is utilized in conjunction with solar collection panels to provide the energy to heat the water. Some more recent work on solar-driven HDH processes have been reported by Al-Hallaj et al [3], Farid et al [4], and Orfi et al [5]. Parekh et al [6] provide a comprehensive review of the HDH process.…”

Section: Introductionmentioning

confidence: 99%

Diffusion‐driven desalination using waste heat in air streams

Knight

Klausner

et al. 2008

Int. J. Energy Res.

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SUMMARYRecently a diffusion-driven desalination (DDD) process has been described as a method for distilling mineralized water. Extensive studies have already examined the performance of the process using waste heat in water streams. This work focuses on the performance of the diffusion tower (evaporator) using waste heat in air streams. Both experimental and parametric investigations are included. It is observed that the evaporation process is very inefficient when heated air and ambient water are input to the diffusion tower. In contrast, efficient evaporation is achieved when both heated air and heated water are input to the diffusion tower. An industrial application is considered where a waste heat air stream at 828C is available and a recuperative heat exchanger is used to heat the feed water. It is found that the optimum operating conditions include an air mass flux of 1:5 kg m À2 s À1 ; an air to feed water mass flow ratio of 10 in the diffusion tower and a fresh water to air mass flow ratio of 2 in the direct contact condenser. At these operating conditions, a fresh water production efficiency of 0.22 and a specific energy consumption of 0:0012 kW h kg À1 can be achieved. The analytical model used to analyze the performance of the DDD process agrees well with the experimental measurements.

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Solar desalination with a humidification-dehumidification cycle: mathematical modeling of the unit

Cited by 70 publications

References 9 publications

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

The potential of solar-driven humidification–dehumidification desalination for small-scale decentralized water production

Desalination based on humidification–dehumidification by air bubbles passing through brackish water

Diffusion‐driven desalination using waste heat in air streams

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