Numerical Investigation on Effects of Step Number on the Stepped Solar Still
Corressponding author's email:
nguyenminhphu@iuh.edu.vnDOI:
https://doi.org/10.54644/jte.2024.1347Keywords:
Distillation, Desalination, CFD, Solar energy, Species transportAbstract
The stepped solar still is a modification of the traditional form to increase productivity by reducing the distance between the heat transfer and mass transfer surfaces. In this paper, two-dimensional numerical simulations of a traditional distiller and step-distillers are presented. The number of steps varies from 2 to 4 while the still dimensions and surface temperatures are the same. The study was to determine the transport characteristics in the evaporative domain and the freshwater yield rate of the stepped types compared with the traditional type. The results show that the optimal number of steps is 3, and the yield of this type is 19.7% higher than that of the traditional one. The productivity of the stepped types is higher than that of the traditional type because the number of primary vortexes is increased from 3 to 5. In addition, the different number of vortexes in a step of the stepped distillers also results in different productivity of the step. The strong secondary vortices at the water and glass surfaces of the conventional type prevent heat and mass transfer.
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References
K. Q. Vo, C. H. Le, and A. Q. Hoang, "Optimization of mass flow rate ratio of water and air in humidification–dehumidification desalination systems," Desalination and water treatment, vol. 246, pp. 82-91, 2022. DOI: https://doi.org/10.5004/dwt.2022.28034
Q. M. Nguyen, S. Jeong, and S. Lee, "Characteristics of membrane foulants at different degrees of SWRO brine concentration by membrane distillation," Desalination, vol. 409, pp. 7-20, 2017. DOI: https://doi.org/10.1016/j.desal.2017.01.007
Q. M. Nguyen and S. Lee, "Fouling analysis and control in a DCMD process for SWRO brine," Desalination, vol. 367, pp. 21-27, 2015. DOI: https://doi.org/10.1016/j.desal.2015.03.039
N. T. Bao, "The mathematical model of basin-type solar distillation systems," Distillation-Modelling, Simulation and Optimization, 2019. DOI: https://doi.org/10.5772/intechopen.83228
H. Ho, V. Hoang and B. Nguyen, "Thermal analysis of water distillation system using pv/t collector combined single basin still," VNUHCM Journal of Engineering and Technology, vol. 5, no. 4, pp. 1661-1678, 2022.
S. Ashtiani and F. Hormozi, "Design improvement in a stepped solar still based on entropy generation minimization," Journal of Thermal Analysis and Calorimetry, vol. 140, pp. 1095-1106, 2020. DOI: https://doi.org/10.1007/s10973-019-08580-3
C. U. Maheswari and R. M. Reddy, "CFD Analysis of different types of single basin solar stills," in IOP Conference Series: Materials Science and Engineering, 2018, vol. 330, no. 1, p. 012097: IOP Publishing. DOI: https://doi.org/10.1088/1757-899X/330/1/012097
S. Rashidi, M. Bovand, N. Rahbar, and J. A. Esfahani, "Steps optimization and productivity enhancement in a nanofluid cascade solar still," Renewable Energy, vol. 118, pp. 536-545, 2018. DOI: https://doi.org/10.1016/j.renene.2017.11.048
M. Keshtkar, M. Eslami, and K. Jafarpur, "Effect of design parameters on performance of passive basin solar stills considering instantaneous ambient conditions: A transient CFD modeling," Solar Energy, vol. 201, pp. 884-907, 2020. DOI: https://doi.org/10.1016/j.solener.2020.03.068
S. S. AlSaleem et al., "Computational Fluid Dynamic Applications for Solar Stills Efficiency Assessment: A Review," Sustainability, vol. 14, no. 17, p. 10700, 2022. DOI: https://doi.org/10.3390/su141710700
N. Rahbar and J. A. Esfahani, "Productivity estimation of a single-slope solar still: Theoretical and numerical analysis," Energy, vol. 49, pp. 289-297, 2013. DOI: https://doi.org/10.1016/j.energy.2012.10.023
M. Edalatpour, A. Kianifar, and S. Ghiami, "Effect of blade installation on heat transfer and fluid flow within a single slope solar still," International Communications in Heat and Mass Transfer, vol. 66, pp. 63-70, 2015. DOI: https://doi.org/10.1016/j.icheatmasstransfer.2015.05.015
N. M. Phu and N. V. Hap, "Numerical Investigation of Natural Convection and Entropy Generation of Water near Density Inversion in a Cavity Having Circular and Elliptical Body," Computational Overview of Fluid Structure Interaction, p. 121, 2020.
S. Chen et al., "A floating solar still inspired by continuous root water intake," Desalination, vol. 512, p. 115133, 2021. DOI: https://doi.org/10.1016/j.desal.2021.115133
M. Keshtkar, M. Eslami, and K. Jafarpur, "A novel procedure for transient CFD modeling of basin solar stills: Coupling of species and energy equations," Desalination, vol. 481, p. 114350, 2020. DOI: https://doi.org/10.1016/j.desal.2020.114350
G. Mittal, "An unsteady CFD modelling of a single slope solar still," Materials Today: Proceedings, vol. 46, pp. 10991-10995, 2021. DOI: https://doi.org/10.1016/j.matpr.2021.02.090
N. Rahbar, A. Asadi, and E. F. Bafghi, "Performance evaluation of two solar stills of different geometries: tubular versus triangular: experimental study, numerical simulation, and second law analysis," Desalination, vol. 443, pp. 44-55, 2018. DOI: https://doi.org/10.1016/j.desal.2018.05.015
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