Recent developments in thermally-driven seawater desalination: Energy efficiency improvement by hybridization of the MED and AD cycles

Ng, Kim Choon; Thu, Kyaw; Oh, Seung Jin; Li, Ang; Shahzad, Muhammad Wakil; Ismail, Azhar Bin

doi:10.1016/j.desal.2014.10.025

Cited by 167 publications

(70 citation statements)

References 93 publications

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“…Any improvements into the energy utilisation and efficiency of desalination processes are therefore important, particularly those that incorporate the use of sustainable energy sources such as industrial waste heat, geothermal, solar and adsorption cycle. Among the mentioned sustainable energy sources for the purpose of desalination, using low temperature waste heat with an adsorption cycle is recently developed by hybridising MED with such a cycle [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermo-economic analysis of two novel low grade sensible heat driven desalination processes

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Thermo-economic analysis of two novel low grade sensible heat driven desalination processes

et al. 2015

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“…The next highest technology was MED, which could approach RO using recent advancements with adsorption cycles [25]. MVC, MSF, and MSVMD had similar performances.…”

Section: Technology Comparisonmentioning

confidence: 99%

“…MED shares features with MSF, including stages (called effects in MED) with generation of water vapor from seawater, and recovery of vapor latent heat to preheat the feed via a heat exchanger [25]. However, in MED vapor passes through the subsequent (less hot) effect through a heat exchanger, and then goes through a flash box to condense pure distillate.…”

Section: Multiple Effect Distillationmentioning

confidence: 99%

“…The organic compounds have similar performance curves, so the working fluid chosen does not make a large difference. This data was readily adaptable to the present study since the inlet temperature for this data roughly matches that of the thermal cycle modeling above (25 • C vs. The entropy generation per unit product from using a Rankine cycle can be calculated from the definition of η II in terms of work, Equation (5), and the relation betweenẆ sep andẆ min least , as seen in Equation (6):…”

Section: Organic Rankine Cyclementioning

confidence: 99%

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Entropy Generation of Desalination Powered by Variable Temperature Waste Heat

Warsinger

Mistry

Nayar

et al. 2015

Entropy

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Powering desalination by waste heat is often proposed to mitigate energy consumption and environmental impact; however, thorough technology comparisons are lacking in the literature. This work numerically models the efficiency of six representative desalination technologies powered by waste heat at 50, 70, 90, and 120• C, where applicable. Entropy generation and Second Law efficiency analysis are applied for the systems and their components. The technologies considered are thermal desalination by multistage flash (MSF), multiple effect distillation (MED), multistage vacuum membrane distillation (MSVMD), humidification-dehumidification (HDH), and organic Rankine cycles (ORCs) paired with mechanical technologies of reverse osmosis (RO) and mechanical vapor compression (MVC). The most efficient technology was RO, followed by MED. Performances among MSF, MSVMD, and MVC were similar but the relative performance varied with waste heat temperature or system size. Entropy generation in thermal technologies increases at lower waste heat temperatures largely in the feed or brine portions of the various heat exchangers used. This occurs largely because lower temperatures reduce recovery, increasing the relative flow rates of feed and brine. However, HDH (without extractions) had the reverse trend, only being competitive at lower temperatures. For the mechanical technologies, the energy efficiency only varies with temperature because of the significant losses from the ORC.Entropy 2015, 17 7531

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“…Adsorption/desorption cycle is widely used as a thermal vapor compressor in chiller [1,2], desalination [3,4], and gas storage applications [5,6], owning to its green nature of being waste heat driven, environmental benign and elimination of major moving parts. The cycle is achieved by periodically cooling and heating solid adsorbents in a gas (known as adsorbate)…”

Section: Introductionmentioning

confidence: 99%

A heat transfer correlation for transient vapor uptake of powdered adsorbent embedded onto the fins of heat exchangers

Thu

Ismail

et al. 2016

Applied Thermal Engineering

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Highlights Detailed study on transient heat transfer of an adsorbent coated heat exchanger. Adsorbent-adsorbate interaction contributes 75% of the total thermal resistance. Transient local heat transfer deviates from the overall value due to thermal mass. A correlation for the transient local adsorption heat transfer coefficient. ABSTRACTWe present a detailed study on the transient heat transfer phenomena of powdered-adsorbent mixed with an organic binder for adherence to the fins of a heat exchangers. The transient performance of such an adsorbent-heat exchanger configuration has significant application potential in the adsorption desalination plants and chillers but seldom addressed in the literature. An experiment is designed to measure the heat transfer for several adsorption temperatures under a single vapor component environment. Analysis on the experimental data indicates that the adsorbent-adsorbate interactions contribute about 75% of the total thermal resistances throughout the uptake processes. It is found that the initial local adsorption heat transfer coefficients are significantly higher than the average values due primarily to the thermal mass effect of the adsorbent-adsorbate interaction layers. From these experiments, a correlation for the transient local adsorption heat transfer coefficients is presented at the sub-atmospheric pressures and assorted application temperatures. KEYWORDS

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Recent developments in thermally-driven seawater desalination: Energy efficiency improvement by hybridization of the MED and AD cycles

Cited by 167 publications

References 93 publications

Thermo-economic analysis of two novel low grade sensible heat driven desalination processes

Thermo-economic analysis of two novel low grade sensible heat driven desalination processes

Entropy Generation of Desalination Powered by Variable Temperature Waste Heat

A heat transfer correlation for transient vapor uptake of powdered adsorbent embedded onto the fins of heat exchangers

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