Economical aspects of the improvement of a mechanical vapour compression desalination plant by dropwise condensation

Lukić, Nebojša; Diezel, Liv Leonore; Fröba, Andreas P.; Leipertz, Alfred

doi:10.1016/j.desal.2010.07.023

Cited by 55 publications

(28 citation statements)

References 5 publications

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“…Lara et al [32] investigated high temperature and pressure MVC, where dropwise condensation can allow greatly enhanced heat transfer coefficients. Lukic et al [33] also investigated the impact of dropwise condensation upon the cost of water produced. Such improvements in heat transfer coefficients reduce the driving temperature difference in the evaporator-condenser leading to a lower compression ratio and thus reduced compressor work requirements per unit of water produced.…”

Section: Mechanical Vapor Compressionmentioning

confidence: 99%

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Entropy Generation Analysis of Desalination Technologies

Mistry

McGovern

Thiel

et al. 2011

Entropy

241

242

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Increasing global demand for fresh water is driving the development and implementation of a wide variety of seawater desalination technologies. Entropy generation analysis, and specifically, Second Law efficiency, is an important tool for illustrating the influence of irreversibilities within a system on the required energy input. When defining Second Law efficiency, the useful exergy output of the system must be properly defined. For desalination systems, this is the minimum least work of separation required to extract a unit of water from a feed stream of a given salinity. In order to evaluate the Second Law efficiency, entropy generation mechanisms present in a wide range of desalination processes are analyzed. In particular, entropy generated in the run down to equilibrium of discharge streams must be considered. Physical models are applied to estimate the magnitude of entropy generation by component and individual processes. These formulations are applied to calculate the total entropy generation in several desalination systems including multiple effect distillation, multistage flash, membrane distillation, mechanical vapor compression, reverse osmosis, and humidification-dehumidification. Within each technology, the relative importance of each source of entropy generation is discussed in order to determine which should be the target of entropy generation minimization. As given here, the correct application of Second Law efficiency shows which systems operate closest to the reversible limit and helps to indicate which systems have the greatest potential for improvement.

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Section: Mechanical Vapor Compressionmentioning

confidence: 99%

“…For an incompressible fluid, entropy is not a function of pressure as seen in Equation (B.2). Therefore, the entropy difference is given by Equation (33). If it is now assumed that the heat exchanger is adiabatic with respect to the environment and that there is no work, then the above equations can be substituted into Equation (31).…”

Section: Appendicesmentioning

confidence: 99%

Entropy Generation Analysis of Desalination Technologies

Mistry

McGovern

Thiel

et al. 2011

Entropy

241

242

View full text Add to dashboard Cite

show abstract

“…The plant production cost C water (€ m À3 ) constitutes a crucial economical criteria of the desalination plant and its operation, it is given as follows [30,31]:…”

Section: Mvc Desalination Production Cost Modelmentioning

confidence: 99%

An optimization model for a mechanical vapor compression desalination plant driven by a wind/PV hybrid system

et al. 2011

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“…This inefficiency increases the required compression ratio and related work. It can be improved by reducing the temperature gradients in evaporation and condensation, e.g., by increasing condensation heat transfer coefficients [41] or increasing surface area [42]. The vapor compressor itself was the next largest source of entropy generation; more efficient air compression technologies may significantly improve MVC efficiency.…”

Section: Mechanical Vapor Compressionmentioning

confidence: 99%

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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Economical aspects of the improvement of a mechanical vapour compression desalination plant by dropwise condensation

Cited by 55 publications

References 5 publications

Entropy Generation Analysis of Desalination Technologies

Entropy Generation Analysis of Desalination Technologies

An optimization model for a mechanical vapor compression desalination plant driven by a wind/PV hybrid system

Entropy Generation of Desalination Powered by Variable Temperature Waste Heat

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