A novel process of humidification-dehumidification with brine recirculation for desalination in remote areas of the world
Desalination and Water Treatment, ISSN: 1944-3986, Vol: 69, Page: 244-251
2017
- 7Citations
- 9Captures
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Article Description
Among the thermal desalination process, the humidification-dehumidification (HDH) is quite energy demanding due to the presence of circulating air (as water carrier from the saline source to the condensation unit) that increases the required interface areas. Nevertheless, this process shows many unique attributes that are pushing a recent revival of R&D in the field of small-scale solar desalination. Within this framework, we believe in the importance of developing solutions for decentralized production in rural remote areas and suggest an innovative process scheme of HDH with brine recirculation. This process assumes the multiple extractions for the minimization of entropy generation and the internal recirculation of brine, in order to cut the cost of seawater pretreatment and the related environmental impacts. The multiple extraction HDH tower with partial rejection of heat and seawater introduces a new concept in the HDH panorama: the closed-air closed-water (CACW). The process scheme of the HDH with brine recirculation and the related mathematical model are presented in the paper. The degrees of freedom of the process and the way to fix the main parameters under conservative assumptions, are discussed in the following. Moreover, the preliminary results of a sensitivity analysis (such as the condenser surfaces and packing tower height) are shown. Although the paper presents the way to drastically improve the theoretical performances of HDH, a solution with acceptable operating costs and mild operating conditions is presented: the arrangement with three extractions and one stage of condensation (~10 m of humidification and dehumidification parallel towers) for an installed capacity of 50 m 3 /day, has a GOR of 3 and a RR of 50% at a maximum process temperature of 65°C.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1944398624146851; http://dx.doi.org/10.5004/dwt.2017.20297; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85020254731&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1944398624146851; https://dx.doi.org/10.5004/dwt.2017.20297; https://www.deswater.com/home.php
Elsevier BV
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