Productivity, exergy, exergoeconomic, and enviroeconomic assessment of hybrid solar distiller using direct salty water h
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RESEARCH ARTICLE
Productivity, exergy, exergoeconomic, and enviroeconomic assessment of hybrid solar distiller using direct salty water heating Hamdy Hassan 1,2
&
Mohamed S. Yousef 3 & Mohamed Fathy 4
Received: 19 June 2020 / Accepted: 9 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this work, experimental work is presented on the performance of a hybrid solar distiller comprising solar still (SS) combined with parabolic trough solar collector (PTSC) using direct heating of salty water by the collector. In this technique, the salty water supplied to the SS is heated by passing it directly through the parabolic receiver without using heat transfer mediums that reduce the system efficiency. The study is carried out at different salty water depths inside the SS basin under hot climate conditions of Upper Egypt. The system performance is compared with a previous system using oil as a heat transfer medium between PTSC and still (indirect heating). The advantages of this technique are its ability to reduce initial salty water depth in the basin and avoid using the pumping system and heat exchanger compared to the direct heating. The performance of the proposed system is evaluated based on productivity, energy payback time (EPBT), exergy, enviroeconomic, and exergoeconomic methodologies. Findings illustrate that the present system rises the energy efficiency by about 12%, 27.5%, and 46% and the system exergy efficiency by about 14%, 30%, and 49% at salty water depth 15 mm, 10 mm, and 5 mm in the basin compared with the indirect heating system. Moreover, using this technique of salty water heating reduces the production cost of freshwater by about 71% compared with the direct heating system. The exergoeconomic and enviroeconomic parameters of the direct heating mechanism are more effective compared with those of the indirect heating mechanism. Keywords Solar still . Parabolic trough solar collector . Performance . Direct and indirect heating . Productivity
Introduction Potable water and energy are two critical necessities for human residents in the present world scenario. However, the amount of usable freshwater is drastically shrinking because of many factors including urban activities, modern lifestyles, and economic development. Along with drinking purposes, clean water is also involved in several industrial and Responsible editor: Philippe Garrigues * Hamdy Hassan [email protected]; [email protected] 1
Energy Resources Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, Egypt
2
Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt
3
Department of Mech. Eng., Benha Faculty of Engineering, Benha University, Benha, Egypt
4
Technical Industrial Institute, Sohag, Egypt
agricultural applications (Manchanda and Kumar 2018). Only 0.5% of the earth’s available water is potable; however, the rest is saline or brackish water which is not naturally potable (Han et al. 2020), which is not
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