EFFECT OF A PACKED ABSORBER ON THE THERMAL EFFICIENCY OF A TUNNEL-TYPE SOLAR DRYING UNIT
DOI:
https://doi.org/10.5281/Keywords:
solar dryer, tunnel dryer, absorber, packing, heat transfer, raw brick, efficiency, solar collector.Abstract
In this study, the effect of a packed absorber on the thermal-technical efficiency of a tunnel-type solar drying unit was investigated. Experiments were carried out under solar radiation of 400-900 W/m², ambient temperature of 28-41°C, and airflow velocities of 20-35 m/s. The results showed that the packed absorber enhances heat transfer intensity, increasing the convective heat transfer coefficient from 22-24 to 27-31 W/m²·K, the useful heat power from 4.2-4.8 to 5.0-5.8 kW, and the efficiency from 0.52-0.55 to 0.58-0.62.
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