Experimental Investigating the effects of delignification of common woods in Iran on the performance of Interfacial solar steam generators

Authors

1 Department of Mechanical Engineering, Engineering Faculty. Razi University, Iran.

2 Department of Mechanical Engineering, Razi University. Kermanshah , Iran

3 Mechanical Engineering Department Ferdowsi University of Mashhad Mashhad, Iran

10.22044/jsfm.2024.14034.3826

Abstract

The use of wood absorbers has been recognized as an effective method for the direct production of solar steam. However, only highly processed wood is suitable for such systems. Thus, the present study aims to investigate the impact of delignification on the performance of wooden absorbents in interfacial solar steam generators, with the goal of expanding the range of wood that can be used as surface adsorbents. In this experimental study, six wood samples from Iran were treated with lignin removal solvent (2.5 M NaOH and 0.4 M Na2SO3). After delignification, the porosity of all the samples increased to approximately 0.76, providing larger microchannels in the wood tissues. For an interfacial solar steam generator equipped with a carbonized natural poplar wood absorber, evaporation rate of 3.63 kg/m2hr was achieved, which was a 101% improvement compared to a volumetric solar steam generator. The delignification process had a significant impact on woods with naturally low evaporation rates, with the highest increase in evaporation rate observed in red poplar wood (25 %), reaching a rate of 3.35 kg/m2hr. Furthermore, no salt deposition was observed on any of the samples after delignification, which is a significant issue in interfacial solar steam generators.

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Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 4
September and October 2024
Pages 73-85

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