Solar desalination under concentrated solar flux and reduced pressure conditions

Autor: Mohammad Alnaief, Muafag Tarawneh, Ibrahem S. Altarawneh, Mohammad A. Batiha, Saleh Rawadieh
Rok vydání: 2020
Předmět:
Zdroj: Solar Energy. 206:983-996
ISSN: 0038-092X
DOI: 10.1016/j.solener.2020.06.058
Popis: This study presents, experimental and theoretical investigation on solar desalination using parabolic trough solar collector. Two parabolic troughs with tow rim angles of 101.4° (PTC1) and 75.75° (PTC2) were equipped with two rectangular absorbers as built-in solar stills. The local concentration ratio (LCR) on the surface of the rectangular absorber has been calculated and compared with that on the surface of a tuber absorber having similar surface area. It has been demonstrated that the shape of the distribution of LCR on the surface of a rectangular absorber was different than that on the surface of a tubular absorber. However, both absorbers were found to gain almost equal concentrated solar flux as indicated by the areas under the distributions. The generated vapor in the rectangular absorber was transferred to a 30° single slope solar still with basin area of 1 m2 which was used as a condenser. Results on solar desalination showed enhanced performance in obtaining salt free water. The productivities of PTC1 in March and April were of about 7.5%, and 9.8% greater than that of PTC2, respectively. Results show that the productivity of PTC1 under reduced pressure was of about 58% greater than that of the same PTC under atmospheric pressure. In addition, the productivity of PTC1 under reduced pressure could reach about 2.97 L/h during the peak period with a daily efficiency of about 87%.
Databáze: OpenAIRE
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