Heat losses in interfacial solar evaporation systems
Maryam Nooman ALMALLAHI, Mohamed Y.E. SELIM, Mahmoud ELGENDI
Abstract. Freshwater is essential for all living beings and has a huge role in meeting the Sustainable Development Goals (SDGs), particularly Clean Water and Sanitation (SDG 6). For that, obtaining freshwater is essential, especially in arid areas where natural resources are not present. Interfacial solar evaporation (ISE) is increasingly popular for clean water generation with its ability to localize heat at the water-air interface. Although heat is localized at the evaporation surface, which significantly improves efficiency, ISE systems still suffer from heat losses to the environment through conduction, convection, and radiation. The conductive heat transfers from the evaporator into the bulk water. The heat loss from convection moves to the surrounding air, while radiation heat loss to the environment. The overall evaporation efficiency is highly dependent on heat losses, which remain a major concern for achieving higher performance. This work provides a brief overview of the heat loss mechanisms in ISE that affect energy conversion efficiency and evaporation rate.
Keywords
Structure Design, Photothermal Material, Interfacial Solar Evaporation
Published online 6/20/2026, 5 pages
Copyright © 2026 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Maryam Nooman ALMALLAHI, Mohamed Y.E. SELIM, Mahmoud ELGENDI, Heat losses in interfacial solar evaporation systems, Materials Research Proceedings, Vol. 67, pp 671-675, 2026
DOI: https://doi.org/10.21741/9781644904176-91
The article was published as article 91 of the book Climate Action and Sustainability
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] J. S. Wijayarathne, G. M. Hassan, and M. J. Holmes, “Clean energy, clean water, and quality education: Prospects of achieving Sustainable Development Goals (SDGs) in Sri Lanka,” in Natural Resources Forum, 2023, vol. 47, no. 4: Wiley Online Library, pp. 610-631.
[2] S. Min Allah, M. Nooman AlMallahi, S. Sripadmanabhan Indira, A. H. Al-Marzouqi, and M. Elgendi, “Recent progress in nanoparticle-based ion exchange membranes for water desalination,” Case Studies in Chemical and Environmental Engineering, vol. 9, p. 100577, 2024/06/01/ 2024, doi: https://doi.org/10.1016/j.cscee.2023.100577.
[3] M. Elgendi et al., “A review of the applications of nanomaterials to augment solar still productivity,” Water Resources Management and Sustainability: Solutions for Arid Regions, pp. 433-446, 2023.
[4] M. N. AlMallahi, S. M. Asaad, and M. Elgendi, “Towards cleaner desalination systems utilizing waste heat: A bibliometric analysis,” International Journal of Thermofluids, vol. 24, p. 100958, 2024/11/01/ 2024. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S2666202724003987.
[5] A. Najjar, M. Nooman AlMallahi, and M. Elgendi, “Evaluating the effect of external and internal condensers on the productivity of solar stills: A review,” (in English), Energy Convers. Manage. X, Review vol. 24, 2024, Art no. 100763, doi: 10.1016/j.ecmx.2024.100763.
[6] A. Serag, M. N. AlMallahi, and M. Elgendi, “Enhancing the performance of solar stills using heating components: A comprehensive review,” (in English), International Journal of Thermofluids, Review vol. 24, 2024, Art no. 100900, doi: 10.1016/j.ijft.2024.100900.
[7] M. Elgendi, A. E. Kabeel, and F. A. Essa, “Improving the solar still productivity using thermoelectric materials: A review,” Alexandria Engineering Journal, vol. 65, pp. 963-982, 2023/02/15/ 2023, doi: https://doi.org/10.1016/j.aej.2022.10.011.
[8] A. Kabeel and S. El-Agouz, “Review of researches and developments on solar stills,” Desalination, vol. 276, no. 1-3, pp. 1-12, 2011.
[9] M. N. AlMallahi, M. Y. E. Selim, and M. Elgendi, “Interfacial solar evaporation using biomass: Environmental impact, financial feasibility, and a bibliometric perspective,” Desalination, vol. 614, p. 119160, 2025/11/01/ 2025, doi: https://doi.org/10.1016/j.desal.2025.119160.
[10] F. Wang, J. Li, W. Bai, C. Wang, and A. Li, “Recent progress on the solar‐driven interfacial evaporation based on natural products and synthetic polymers,” Solar Rrl, vol. 5, no. 12, p. 2100475, 2021.
[11] M. N. AlMallahi et al., “Pyrolyzed moringa seed-based photothermal absorber for enhanced solar interfacial evaporation,” Solar Energy Materials and Solar Cells, vol. 295, p. 113965, 2026/01/15/ 2026. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0927024825005665.
[12] Z. Fan et al., “Synergism of solar-driven interfacial evaporation and photo-Fenton Cr (VI) reduction by sustainable Bi-MOF-based evaporator from waste polyester,” Journal of Energy Chemistry, vol. 94, pp. 527-540, 2024.
[13] Z. Zhan, Y. Su, M. Xie, Y. Li, Y. Shuai, and Z. Wang, “Recent advances and challenges for bionic solar water evaporation,” Materials Today, vol. 80, pp. 529-548, 2024/11/01/ 2024, doi: https://doi.org/10.1016/j.mattod.2024.08.018.
[14] K. N. Opoku et al., “Advances in photothermal water evaporation: synthesis, mechanisms, and coupled techniques,” Energy Materials, vol. 5, no. 2, pp. N/A-N/A, 2025.
[15] M. N. AlMallahi, M. Y. E. Selim, and M. Elgendi, “Exploring the evolution of solar-driven interfacial evaporation: Bibliometric and trends analyses,” Solar Energy Advances, vol. 5, p. 100116, 2025/01/01/ 2025, doi: https://doi.org/10.1016/j.seja.2025.100116.
[16] Y. Wang, J. Hu, L. Yu, X. Wu, Y. Zhang, and H. Xu, “Recent strategies for constructing efficient interfacial solar evaporation systems,” Nano Res. Energy, vol. 2, no. 2, p. e9120062, 2023.
[17] H. Yu et al., “A New Era of Passive Continuous Freshwater Production: When Interfacial Solar Evaporation Marries Moisture Harvest,” ACS Energy Letters, vol. 10, no. 3, pp. 1192-1215, 2025/03/14 2025, doi: 10.1021/acsenergylett.5c00038.
[18] Y. Liang et al., “Recent innovations in 3D solar evaporators and their functionalities,” Science Bulletin, vol. 69, no. 22, pp. 3590-3617, 2024/11/30/ 2024, doi: https://doi.org/10.1016/j.scib.2024.09.015.
[19] R. Zhu, D. Wang, J. Zhang, Z. Yu, M. Liu, and S. Fu, “Biomass eggplant-derived photothermal aerogels with Janus wettability for cost-effective seawater desalination,” Desalination, vol. 527, p. 115585, 2022/04/01/ 2022, doi: https://doi.org/10.1016/j.desal.2022.115585.
[20] C. Xu, M. Gao, X. Yu, J. Zhang, Y. Cheng, and M. Zhu, “Fibrous aerogels with tunable superwettability for high-performance solar-driven interfacial evaporation,” Nano-Micro Letters, vol. 15, no. 1, p. 64, 2023.
[21] C. Liang et al., “Carbon foam directly synthesized from industrial lignin powder as featured material for high efficiency solar evaporation,” Chemical Engineering Journal, vol. 481, p. 148375, 2024.
[22] W. Zhang, T. Zheng, H. Zhu, D. Wu, C. Zhang, and H. Zhu, “Insight into the role of the channel in photothermal materials for solar interfacial water evaporation,” Renewable Energy, vol. 193, pp. 706-714, 2022/06/01/ 2022, doi: https://doi.org/10.1016/j.renene.2022.04.139.
[23] Y. Liu et al., “3D printed electrospun nanofiber-based pyramid-shaped solar vapor generator with hierarchical porous structure for efficient desalination,” Chemical Engineering Journal, vol. 452, p. 139402, 2023.
[24] Y. Yang et al., “Graphene-Based Standalone Solar Energy Converter for Water Desalination and Purification,” ACS Nano, vol. 12, no. 1, pp. 829-835, 2018/01/23 2018, doi: 10.1021/acsnano.7b08196.
[25] X. Mu et al., “All-in-one MXene/PDA@MF-EF solar steam generator with semi-clad construction for efficient interfacial evaporation, water purification and desalination,” Separation and Purification Technology, vol. 361, p. 131344, 2025/07/19/ 2025, doi: https://doi.org/10.1016/j.seppur.2024.131344.
[26] C. Song, Z. Jiang, X. Gu, H. Li, and J. Shi, “A bilayer solar evaporator with all-in-one design for efficient seawater desalination,” Journal of Colloid and Interface Science, vol. 616, pp. 709-719, 2022/06/15/ 2022, doi: https://doi.org/10.1016/j.jcis.2022.02.075.

