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Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
December, 14-17, 2023, Bihar, India

A Novel Bi-Facial Hybrid Wick Approach for Enhanced Solar-Vapor Conversion Efficiency

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.1840
pages 1125-1129


Interfacial vapor generation using solar energy has received tremendous attention in the last decade. This strategy using heat localization, has successfully addressed the low water productivity inherent in traditional Solar-thermal desalination devices. A combination of photothermal coatings having very high absorptivity and low thermally conductive materials for water transport are employed to achieve this heat localization. However, in most cases the proposed fabrication methodologies require sophisticated techniques and are often neither scalable or reliable for long term application. On the other hand, in the literature attributed to design of heat pipes it is well accepted that high thermal conductive porous materials have higher evaporation rate. In this work we propose for the first time a hybrid evaporator made of nickel sintered wick and cotton fabric to achieve heat localization as well as enhanced evaporation rate. We also show that instead of the common Floating Evaporator (FE) type configuration, a Bi-Facial (BF) configuration can enhance the evaporation rate and solar-vapor conversion efficiency as well. Here, we compare the temperature distribution in the evaporator, evaporation rate and solar-vapor conversion efficiency for four different configurations. The four configurations namely Floating Evaporator without black coating, Floating Evaporator with black coating, Bi-Facial evaporator without coating and Bi-Facial with coating. All the four configurations were tested under a AAA class Solar simulator. The Bi-Facial with black coating reported the highest evaporation rate of 1.632 kg/m2/hr and a solarvapor conversion efficiency of ~ 95%.