Thermodynamic analysis of humidification dehumidification desalination cycles

Narayan, G. Prakash; Sharqawy, Mostafa H.; Lienhard, John H.; Zubair, Syed M.

doi:10.5004/dwt.2010.1078

Cited by 310 publications

(123 citation statements)

References 25 publications

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“…The humidity ratios are much higher at pressures lower than atmospheric pressure. This is expected to increase the water production many times for the HDH cycle [75]. For example, at a dry bulb temperature of 60°C, the humidity ratio at 50 kPa is ~150% higher than at atmospheric pressure ( figure 19).…”

Section: ) Possible Improvements To the Hdh Cyclementioning

confidence: 99%

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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

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358

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: ) Possible Improvements To the Hdh Cyclementioning

confidence: 99%

“…Seawater gets heavily preheated in the dehumidifier and the air in turn is heated and humidified in the humidifier [75].…”

Section: ) Possible Improvements To the Hdh Cyclementioning

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

Self Cite

358

132

View full text Add to dashboard Cite

show abstract

“…The value of these conditions are the standard conditions in EES and have been used in several previous thermodynamic studies, e.g. [2,25,15,17,26,27].…”

Section: Solution Techniquementioning

confidence: 99%

Exergy analysis of a high-temperature-steam-driven, varied-pressure, humidification–dehumidification system coupled with reverse osmosis

2013

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In this study, exergy analysis of a novel desalination system is presented and discussed. The water desalination is carried out using combined humidification-dehumidification and reverse osmosis technologies. Six system performance parameters are examined: overall exergetic efficiency, equivalent electricity consumption, specific exergy destruction, specific exergy lost, and total true specific exergy lost, as well as the exergy destruction ratios of the main components. The total true specific exergy lost is a new parameter presented in this study. It is a function of summation of total the exergy destruction rate and loss per total mass flow rate of the total pure water produced. This parameter is found to be a useful parameter to assess the exergetic performance of the system considered. By contrast, use of overall exergetic efficiency as an assessment tool can result in misleading conclusions for such a desalination system and, hence, is not recommended. Furthermore, this study reveals that the highest exergy destruction occurs in the thermal vapor compressor, which accounts for 50% of the total exergy destruction of the system considered. This study, in addition, demonstrates that the specific exergy destruction of the dehumidifier and TVC are the parameters that most strongly affect the performance of the system.

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“…By evaporating water at the partial pressure of vapor in air, the top temperature of HDH is naturally reduced (when compared to pure water), and as a result can be run using lower-temperature heat sources. Despite these advantages, and much work on improving the performance of the system through thermodynamic cycle analyses [2][3][4], HDH remains economically infeasible in many settings as a result of its relatively low energetic performance (as quantified by performance parameters discussed below).…”

Section: The Humidificationdehumidification Cyclementioning

confidence: 99%

Effect of mass extractions and injections on the performance of a fixed-size humidification–dehumidification desalination system

et al. 2013

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The impact of mass extractions and injections as a method for increasing the energetic performance of fixed-size humidification-dehumidification desalination systems is examined. Whereas previous studies of this problem have been restricted to thermodynamic models, the use of a more complete model that includes transport provides the ability to quantify the impact of mass extractions/injections on a realizable, fixed-size system. For a closed air, open water cycle, the results show that a single water extraction from the dehumidifier to the humidifier increases the gained output ratio by up to 10%, with extractions higher in the cycle proving more effective. The sizing problem for the humidifier and dehumidifier under thermodynamically optimized conditions found in literature is also discussed, as is the impact of system size on overall performance of a system without extractions/injections. For a range of sizes, it is shown that a rough doubling of both dehumidifier and humidifier size results in a two-to three-fold increase in gained output ratio, with diminishing returns as the absolute sizes increase.

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Thermodynamic analysis of humidification dehumidification desalination cycles

Cited by 310 publications

References 25 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

Exergy analysis of a high-temperature-steam-driven, varied-pressure, humidification–dehumidification system coupled with reverse osmosis

Effect of mass extractions and injections on the performance of a fixed-size humidification–dehumidification desalination system

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