Optical characterization and thermal performance of a novel solar dryer with dynamic control of solar radiation
Year: 2024
Type: article
Abstract: In this study, we designed, constructed, and characterized a novel adaptive coating solar dryer (PDLC). Our focus was on evaluating its optical properties and thermal performance by modulating the transmission of solar radiation toward the drying chamber. Unlike conventional direct dryers, our proposed solar drying system harnesses direct solar radiation, known for its rapid drying process, while minimizing the impact on product properties. The results show that the PDLC coating exhibited a significant difference in transmittance between the “on” and “off” states. At 400 nm, the transmittance varied by 20%, increasing to 30% at 450 nm. The cylindrical solar dryer (SDIC) consistently maintained a temperature range of 52.19°C to 57°C. Additionally, it achieved lower relative humidity levels compared to the uncontrolled solar dryer (SCD), resulting in uniform irradiance distribution within the drying cabinet. In contrast, the solar dryer with dynamic solar irradiance control (acrylic and PDLC film) presents a total thermal resistance (0.02817 mK/W) exhibiting better heat permanence inside the drying cabinet compared to polycarbonate (one of the most commonly used materials for drying systems). The system’s thermal efficiency ensures reliable operation regardless of weather conditions, efficiently capturing and converting solar energy into heat.
Language: English
Topic: Food Drying and Modeling
Subfield: Food Science
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $1,210
OpenAlex ID: W4402174579