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Water 2018, 10(3), 305; https://doi.org/10.3390/w10030305

Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating

1
The Higher Institute of Industrial Technology, Engila, Tripoli, P.O. Box 89025, Libya
2
College of Technological Studies, Mechanical Power and Refrigeration Engineering Technology, Al-Asamah, Shuwaikh Educational, P.O. Box 23167, Safat 13092, Kuwait
3
Sir Joseph Swan Centre for Energy Research, School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
*
Author to whom correspondence should be addressed.
Received: 3 February 2018 / Revised: 25 February 2018 / Accepted: 4 March 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Desalination and Water Treatment)
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Abstract

Desalination is the sole proven technique that can provide the necessary fresh water in arid and semi-arid countries in sufficient quantities and meet the modern needs of a growing world population. Multi effect desalination with thermal vapour compression (MED-TVC) is one of most common applications of thermal desalination technologies. The present paper presents a comprehensive thermodynamic model of a 24 million litres per day thermal desalination plant, using specialised software packages. The proposed model was validated against a real data set for a large-scale desalination plant, and showed good agreement. The performance of the MED-TVC unit was investigated using different loads, entrained vapour, seawater temperature, salinity and number of effects in two configurations. The first configuration was the MED-TVC unit without preheating system, and the second integrated the MED-TVC unit with a preheating system. The study confirmed that the thermo-compressor and its effects are the main sources of exergy destruction in these desalination plants, at about 40% and 35% respectively. The desalination plant performance with preheating mode performs well due to high feed water temperature leading to the production of more distillate water. The seawater salinity was proportional to the fuel exergy and minimum separation work. High seawater salinity results in high exergy efficiency, which is not the case with membrane technology. The plant performance of the proposed system was enhanced by using a large number of effects due to greater utilisation of energy input and higher generation level. From an economic perspective, both indicators show that using a preheating system is more economically attractive. View Full-Text
Keywords: exergy; thermal desalination; thermo-compressor; waste exergy; cost estimation exergy; thermal desalination; thermo-compressor; waste exergy; cost estimation
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Eshoul, N.; Almutairi, A.; Lamidi, R.; Alhajeri, H.; Alenezi, A. Energetic, Exergetic, and Economic Analysis of MED-TVC Water Desalination Plant with and without Preheating. Water 2018, 10, 305.

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