Solar desalination with a humidification-dehumidification technique — a comprehensive technical review

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

doi:10.1016/s0011-9164(04)90007-0

Cited by 170 publications

(51 citation statements)

References 43 publications

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“…Reference source not found. [3], distillation/desalination [4], building heating and cooling [5], and other engineered systems. Enhancement of the mass transfer rate during condensation and facilitation of liquid removal from the surface can reduce operational cost and improve efficiency in these applications.…”

Section: Introductionmentioning

confidence: 99%

The effect of relative humidity on dropwise condensation dynamics

Castillo

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

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Dropwise condensation of atmospheric water vapor is important in multiple practical engineering applications. The roles of environmental factors and surface morphology/chemistry on the condensation dynamics need to be better understood to enable efficient water-harvesting, dehumidication, and other psychrometric processes. Systems and surfaces that may promote faster condensation rates and selfshedding of condensate droplets could lead to improved mass transfer rates and higher water yields in harvesting applications. In the present study, experiments are performed in a facility that allows visualization of the condensation process on a vertically oriented, hydrophobic surface at a controlled relative humidity and surface subcooling temperature. The distribution and growth of water droplets are monitored across the surface at different relative humidities (45%, 50%, 55%, and 70%) at a constant surface subcooling temperature of 15 °C below the ambient temperature. The droplet growth dynamics exhibits a strong dependency on relative humidity in the early stages during which there is a large population of small droplets on the surface and single droplet growth dominates over coalescence effects.At later stages, the dynamics of droplet growth is insensitive to relative humidity due to the dominance of coalescence effects. The overall volumetric rate of condensation on the surface is also assessed as a function of time and ambient relative humidity. Low relative humidity conditions not only slow the absolute rate of condensation, but also prolong an initial transient regime over which the condensation rate remains significantly below the steady-state value.Keywords: dropwise condensation, relative humidity, growth dynamics, droplet distribution,

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Section: Introductionmentioning

confidence: 99%

The effect of relative humidity on dropwise condensation dynamics

Castillo

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

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“…Solar stills are the most basic form of HD but prove to be inefficient since the enthalpy of vaporization is lost in the condensation process [1]. The basis of HD desalination cycles is to improve system efficiency by recapturing this energy, by separating the evaporation and condensation processes, and by incorporating regenerative heating of the feedwater stream in the condenser.…”

Section: Introductionmentioning

confidence: 99%

“…The basis of HD desalination cycles is to improve system efficiency by recapturing this energy, by separating the evaporation and condensation processes, and by incorporating regenerative heating of the feedwater stream in the condenser. Due to the straightforward design and the potential for production of potable water in remote areas without the need for electricity, HD has received considerable attention over the past few years [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Optimal operating conditions and configurations for humidification–dehumidification desalination cycles

Mistry¹,

Mitsos²,

Lienhard³

2011

International Journal of Thermal Sciences

101

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This article applies nonlinear programming techniques to optimize humidification-dehumidification (HD) desalination cycles for operating conditions that result in maximum gained output ratio (GOR). Closed air open water as well as open air open water cycles, each with either an air or a water heater, were considered in this analysis.Numerical optimization resulted in a substantial increase in GOR for all four cycle types compared to previous best-case conditions found using heuristic studies. The GOR of the cycles was found to decrease with increasing component terminal temperature difference (TTD). In addition, different cycles perform best at different temperature differences. Optimization also revealed that some counterintuitive design configurations can result in superior performance under the appropriate operating conditions.

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“…6a. www.intechopen.com Multi-effect distillation unit was developed in Germany (Muller-Hoist et al, 1999) and then applied on the island of Fuerteventura, where it is working for several years without almost any maintenance or repair. The optimized module produced 40 L/h of fresh water, but it was shown that production of 1000 L/d is possible when the unit was operated continuously for 24 h. Based on a collector area of 38 m 2 , the daily productivity of the optimized module is about 26 L/m 2 of collector area for a 24-h run and with thermal storage under optimized laboratory conditions (Parekh et al, 2004). a b Application of solar chimney to generation of energy and sea water desalination, which is shown in Fig.…”

Section: Solar Desalinationmentioning

confidence: 99%

“…6. Sketch of a natural draft air circulation MEH desalination unit (Parekh et al, 2004) (a), Schematic diagram of the integrated desalination system with solar chimney (Zuo, 2011) (b).…”

Section: Solar Desalinationmentioning

confidence: 99%