A Comparative Numerical Study of Three Similar Passive Solar Stills: Single Slope, V-Type, and Greenhouse
DOI:
https://doi.org/10.37934/cfdl.16.1.6878Keywords:
Desalination, Solar distillation, Double slope, SymmetryAbstract
In this paper, three solar stills with similar geometries are numerically investigated for analysis and comparison. The solar stills include single slope, V-type, and greenhouse stills. Steady-state laminar flow numerical simulations with different water surface temperatures and cover glass temperatures are performed. Simulation results were confirmed with data from analytical and experimental models to ensure reliability. The results showed that the V-type still has a higher number of recirculation zones than that of single slope and greenhouse stills. These vortex regions are small, but the velocity magnitude is no less than the other two stills. This difference makes the freshwater yield and convection heat transfer coefficient of V-type still the largest. Daily freshwater productions of single slope, V-type, and greenhouse stills are 0.592, 0.673, and 0.623 kg/m2, respectively. Productivity at 15 PM is 2.5 times higher than the hours from noon to 14 PM. The natural convection heat transfer coefficient seemed to be unvaried with the temperature difference but changed strongly with the still geometry.
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References
Rabhy, O.O., et al., Numerical and experimental analyses of a transparent solar distiller for an agricultural greenhouse. Applied Energy, 2019. 253: p. 113564.
https://doi.org/10.1016/j.apenergy.2019.113564
Vo, K.Q., 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, 2022. 246: p. 82-91.
https://doi.org/10.5004/dwt.2022.28034
Hồ, H.Đ. and V.V. Hoàng, Thermal analysis of water distillation system using pv/t collector combined single basin still. VNUHCM Journal of Engineering and Technology, 2022. 5(4): p. 1661-1678.
https://doi.org/10.32508/stdjet.v5i4.1033
Rashid, F.L., A.S. Shareef, and H.F. Alwan, Enhancement of fresh water production in solar still using new phase change materials. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2019. 61(1): p. 63-72.
Mugisidi, D., et al., Iron Sand as a Heat Absorber to Enhance Performance of a Single-Basin Solar Still. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2020. 70(1): p. 125-135.
https://doi.org/10.37934/arfmts.70.1.125135
Haddad, Z., et al., Experimental Study of an Inclined Wick Solar Still Operating in Drop by Drop System Under The Climatic Conditions of Hodna's Region, Algeria. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2022. 94(1): p. 188-199.
https://doi.org/10.37934/arfmts.94.1.188199
Nahoui, A., et al., Numerical Study of a Basin Type Solar Still with a Double Glass Cover Under Winter Conditions. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 2021. 88(1): p. 35-48.
https://doi.org/10.37934/arfmts.88.1.3548
Kumar, B.S., S. Kumar, and R. Jayaprakash, Performance analysis of a "V" type solar still using a charcoal absorber and a boosting mirror. Desalination, 2008. 229(1-3): p. 217-230.
https://doi.org/10.1016/j.desal.2007.09.009
Suneesh, P., et al., Effect of air flow on "V" type solar still with cotton gauze cooling. Desalination, 2014. 337: p. 1-5.
https://doi.org/10.1016/j.desal.2013.12.035
Rahbar, N., A. Asadi, and E. Fotouhi-Bafghi, Performance evaluation of two solar stills of different geometries: tubular versus triangular: experimental study, numerical simulation, and second law analysis. Desalination, 2018. 443: p. 44-55.
https://doi.org/10.1016/j.desal.2018.05.015
Rahbar, N. and J.A. Esfahani, Productivity estimation of a single-slope solar still: Theoretical and numerical analysis. Energy, 2013. 49: p. 289-297.
https://doi.org/10.1016/j.energy.2012.10.023
Edalatpour, M., 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, 2015. 66: p. 63-70.
https://doi.org/10.1016/j.icheatmasstransfer.2015.05.015
Rashidi, S., et al., Volume of fluid model to simulate the nanofluid flow and entropy generation in a single slope solar still. Renewable Energy, 2018. 115: p. 400-410.
https://doi.org/10.1016/j.renene.2017.08.059
Keshtkar, M., M. Eslami, and K. Jafarpur, A novel procedure for transient CFD modeling of basin solar stills: Coupling of species and energy equations. Desalination, 2020. 481: p. 114350.
https://doi.org/10.1016/j.desal.2020.114350
Chen, S., et al., A floating solar still inspired by continuous root water intake. Desalination, 2021. 512: p. 115133.
https://doi.org/10.1016/j.desal.2021.115133
Shoeibi, S., et al., Performance evaluation of a solar still using hybrid nanofluid glass cooling-CFD simulation and environmental analysis. Sustainable Energy Technologies and Assessments, 2022. 49: p. 101728.
https://doi.org/10.1016/j.seta.2021.101728
Yan, T., et al., CFD investigation of vapor transportation in a tubular solar still operating under vacuum. International Journal of Heat and Mass Transfer, 2020. 156: p. 119917.
https://doi.org/10.1016/j.ijheatmasstransfer.2020.119917
Phu, N.M. and N. Van 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, 2020: p. 121.
https://doi.org/10.5772/intechopen.95301
Thanh, L.N., P.N. Minh, and H.N. Minh, Entropy Generation, Heat Transfer of Water Near Density Inversion Region with Relative Positions of Hot and Cold Walls: Numerical Analysis. CFD Letters, 2023. 15(5): p. 42-53.
https://doi.org/10.37934/cfdl.15.5.4253
Rashidi, S., J.A. Esfahani, and N. Rahbar, Partitioning of solar still for performance recovery: experimental and numerical investigations with cost analysis. Solar Energy, 2017. 153: p. 41-50.
https://doi.org/10.1016/j.solener.2017.05.041
Mittal, G., An unsteady CFD modelling of a single slope solar still. Materials Today: Proceedings, 2021. 46: p. 10991-10995.
https://doi.org/10.1016/j.matpr.2021.02.090
Nguyen Thanh, L. and P. Nguyen Minh, First and Second Law Evaluation of Multipass Flat-Plate Solar Air Collector and Optimization Using Preference Selection Index Method. Mathematical Problems in Engineering, 2021. 2021: p. 5563882.
