Version 1
: Received: 24 September 2024 / Approved: 24 September 2024 / Online: 25 September 2024 (11:45:40 CEST)
How to cite:
Islam, S.; Furuta, H. Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications. Preprints2024, 2024091955. https://doi.org/10.20944/preprints202409.1955.v1
Islam, S.; Furuta, H. Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications. Preprints 2024, 2024091955. https://doi.org/10.20944/preprints202409.1955.v1
Islam, S.; Furuta, H. Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications. Preprints2024, 2024091955. https://doi.org/10.20944/preprints202409.1955.v1
APA Style
Islam, S., & Furuta, H. (2024). Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications. Preprints. https://doi.org/10.20944/preprints202409.1955.v1
Chicago/Turabian Style
Islam, S. and Hiroshi Furuta. 2024 "Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications" Preprints. https://doi.org/10.20944/preprints202409.1955.v1
Abstract
This study investigates the process of multi-walled carbon nanotube (MWCNT) coatings to enhance the lamp heating temperature for solar thermal absorption applications. The primary focus is studying the effects of self-organized honeycomb structures of CNTs formed on silicon substrates on different cell area ratios (CAR). The drop-casting process developed honeycomb-structured MWCNT-coated absorbers with varying CAR values ranging from ~ 60% to 17%. The optical properties were investigated within the visible (400-800 nm) and near-infrared (934-1651nm) wavelength ranges. Although fully coated MWCNT absorbers showed the lowest reflectance, honeycomb structures with a ~ 17% CAR achieved high-temperature absorption. These structures maintained 8.4% reflectance at 550 nm while dramatically increasing infrared reflection to 80.5% at 1321 nm. The performance of solar thermal was assessed throughout a range of irradiance intensities, from 0.04 W/cm² to 0.39 W/cm². The honeycomb structure with a ~17% CAR value consistently performed better than other structures by reaching the highest absorption temperatures (ranging from 52.5°C to 285.5°C) across all measured intensities. A direct correlation was observed between the reflection ratio (visible: 550 nm / infrared: 1321 nm) and temperature absorption efficiency, where lower reflection ratios were associated with higher temperature absorption. This study highlights the significant potential for the large-scale production of cost-effective solar thermal absorbers through the application of optimized honeycomb-structured absorbers coated with MWCNTs. These contributions enhance solar energy efficiency for applications in water heating and purification, thereby promoting sustainable development.
Keywords
solar absorber; spectral selectivity; Honeycomb structure; drop casting technique; CNTs; solar radiation intensity
Subject
Physical Sciences, Applied Physics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
