Determining the optimal number of collector layers in fog water harvesting system

Document Type : Research Article

Authors

1 Water Engineering Department , University of Mohaghegh Ardabili, Ardabil, Iran

2 Water Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

Enhancing fog collector efficiency can be achieved by increasing the number of layers in various collectors. This study scrutinized the influence of layers on efficiency for conventional collectors (Raschel and Aluminum mesh) through a meticulous analysis of theoretical relationships and the execution of experimental tests. In the laboratory phase, following the installation of the system, the output flow from the humidifier was directed toward the collecting plate. Subsequently, the efficiency of collectors with 1, 2, 5, and 7 layers was assessed and compared based on the amount of collected water post-fog extraction. The results of the investigation into the theoretical relations governing water extraction from fog revealed a significant trend. As the shade coefficient of the collector increases, aerodynamic efficiency demonstrates an initial increase, peaking at 50-60%, followed by a subsequent decrease. Furthermore, the efficiency of Raschel and Aluminum mesh is intricately linked to the number of layers, with the highest theoretical efficiency observed at 4 and 7 layers, respectively. Experimental findings indicated the highest water collection efficiency for Raschel mesh with 5 layers at 55.3% and for Aluminum mesh with 6 layers at 58.1%. In terms of cost-effectiveness, the optimal number of layers for Raschel and Aluminum mesh is determined to be 2 and 4 layers, respectively.

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Main Subjects


[1] S.A. Abdul-Wahab, H. Al-Hinai, K.A. Al-Najar, M.S. Al-Kalbani, Feasibility of fog water collection: a case study from Oman, Journal of Water Supply: Research and Technology—AQUA, 56(4) (2007) 275-280.
[2] R.S. Schemenauer, P. Cereceda, A proposed standard fog collector for use in high-elevation regions, Journal of applied Meteorology and Climatology, 33(11) (1994) 1313-1322.
[3] D. Carvajal, M. Mora-Carreño, C. Sandoval, S. Espinoza, Assessing fog water collection in the coastal mountain range of Antofagasta, Chile, Journal of Arid Environments, 198 (2022) 104679.
[4] S. Montecinos, P. Cereceda, D. Rivera, Fog collection and its relationship with local meteorological variables in a semiarid zone in Chile, Atmósfera, 31(2) (2018) 143-153.
[5] O. Klemm, R.S. Schemenauer, A. Lummerich, P. Cereceda, V. Marzol, D. Corell, J. Van Heerden, D. Reinhard, T. Gherezghiher, J. Olivier, Fog as a fresh-water resource: overview and perspectives, Ambio, 41 (2012) 221-234.
[6] A. Ritter, C. Regalado, G. Aschan, Fog water collection in a subtropical elfin laurel forest of the Garajonay National Park (Canary Islands): a combined approach using artificial fog catchers and a physically based impaction model, Journal of Hydrometeorology, 9(5) (2008) 920-935.
[7] M. Fessehaye, S.A. Abdul-Wahab, M.J. Savage, T. Kohler, S. Tesfay, The potential for scaling up a fog collection system on the eastern escarpment of Eritrea, Mountain Research and Development, 35(4) (2015) 365-373.
[8] R.S. Schemenauer, P.I. Joe, The collection efficiency of a massive fog collector, Atmospheric Research, 24(1-4) (1989) 53-69.
[9] M.J. Estrela, J.A. Valiente, D. Corell, D. Fuentes, A. Valdecantos, Prospective use of collected fog water in the restoration of degraded burned areas under dry Mediterranean conditions, Agricultural and forest meteorology, 149(11) (2009) 1896-1906.
[10] D.C. Villacrés, J.L. Carrera Villacrés, T. Braun, Z. Zhao, J. Gómez, J.Q. Carabalí, Fog harvesting and IoT based environment monitoring system at the Ilalo volcano in Ecuador, International journal on advanced science, engineering and information technology, 10(1) (2020) 407-412.
[11] J. de Dios Rivera, Aerodynamic collection efficiency of fog water collectors, Atmospheric Research, 102(3) (2011) 335-342.
[12] A. Moncuquet, A. Mitranescu, O.C. Marchand, S. Ramananarivo, C. Duprat, Collecting fog with vertical fibres: combined laboratory and in-situ study, Atmospheric Research, 277 (2022) 106312.
[13] C.M. Regalado, A. Ritter, The design of an optimal fog water collector: A theoretical analysis, Atmospheric Research, 178 (2016) 45-54.
[14] S. Vogel, U. Müller-Doblies, Desert geophytes under dew and fog: The “curly-whirlies” of Namaqualand (South Africa), Flora-Morphology, Distribution, Functional Ecology of Plants, 206(1) (2011) 3-31.
[15] M. Azad, D. Ellerbrok, W. Barthlott, K. Koch, Fog collecting biomimetic surfaces: Influence of microstructure and wettability, Bioinspiration & biomimetics, 10(1) (2015) 016004.
[16] K.-C. Park, S.S. Chhatre, S. Srinivasan, R.E. Cohen, G.H. McKinley, Optimal design of permeable fiber network structures for fog harvesting, Langmuir, 29(43) (2013) 13269-13277.
[17] A.T. Paxson, J.L. Yagüe, K.K. Gleason, K.K. Varanasi, Stable dropwise condensation for enhancing heat transfer via the initiated chemical vapor deposition (iCVD) of grafted polymer films, Adv. Mater, 26(3) (2014) 418-423.
[18] D. Torresin, M.K. Tiwari, D. Del Col, D. Poulikakos, Flow condensation on copper-based nanotextured superhydrophobic surfaces, Langmuir, 29(2) (2013) 840-848.
[19] M. Mousavi Baygi, The implementation of fog water collection systems in Northeast of Iran, International Journal of Pure and Applied Physics, 4 (2008).
[20] J. Goodman, The collection of fog drip, Water Resources Research, 21(3) (1985) 392-394.
[21] H. Glauert, D. Hirst, A. Hartshorn, Induced flow through a partially choked pipe, His Majesty's Stationery Office, Great Britain, (1932).
[22] I.E. Idel'Cik, Memento des pertes de charge, Collection de la Direction des Etudes et Recherches d'Electricité de France,  (1969).
[23] J.-K. Koo, D.F. James, Fluid flow around and through a screen, Journal of Fluid Mechanics, 60(3) (1973) 513-538.
[24] W. Shi, M.J. Anderson, J.B. Tulkoff, B.S. Kennedy, J.B. Boreyko, Fog harvesting with harps, ACS applied materials & interfaces, 10(14) (2018) 11979-11986.
[25] I. Langmuir, K. Blodgett, A mathematical investigation of water droplet trajectories, Army Air Forces Headquarters, Air Technical Service Command, United States,(1946).
[26] B. Demoz, J. Collett Jr, B. Daube Jr, On the Caltech active strand cloudwater collectors, Atmospheric Research, 41(1) (1996) 47-62.
[27] D. Gurera, B. Bhushan, Optimization of bioinspired conical surfaces for water collection from fog, Journal of colloid and interface science, 551 (2019) 26-38.
[28] J. Ju, Y. Zheng, L. Jiang, Bioinspired one-dimensional materials for directional liquid transport, Accounts of chemical research, 47(8) (2014) 2342-2352.
[29] A. Lee, M.-W. Moon, H. Lim, W.-D. Kim, H.-Y. Kim, Water harvest via dewing, Langmuir, 28(27) (2012) 10183-10191.
[30] M. Rajaram, X. Heng, M. Oza, C. Luo, Enhancement of fog-collection efficiency of a Raschel mesh using surface coatings and local geometric changes, Colloids and surfaces A: physicochemical and engineering aspects, 508 (2016) 218-229.