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Modelling and analysis of a hybrid solar dryer for woody biomass

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  • Khouya, Ahmed

Abstract

Drying is necessary for wood biomass to be used in various applications such as heating. This work aims to assess the energy and performance of a hybrid solar dryer for woody biomass. The study is carried out by establishing the energy and mass balance in a prototype hybrid kiln. A mathematical model for predicting heat and mass transfer during the biomass drying process is developed and validated. The drying parameters are evaluated for a hybrid solar kiln witch integrate a heat pump and a condensing gas boiler. The results show that the energy consumption ratio decreases as the set-temperature increases. The combined use of a solar air collector and a heat pump allows a reduction of 52, 37 and 24% in terms of drying time for the three set temperatures 50, 60 and 70 °C, respectively. The use of a recycled air fraction of 75% in the hybrid solar dryer has the effect of reducing the energy consumption up to 84% and improving the drying efficiency by 92%. The results also show that the moisture extraction rate and the specific moisture extraction rate decrease as the bed height/wood chip effective diameter ratio increases. The use of a porous medium with an optimal vacuum rate is also desirable in order to improve the thermal performance of the drying system. The overall results show that the combined use of a solar air collector and a heat pump is an effective solution to reduce energy consumption and improve thermal performance during the biomass drying process.

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  • Khouya, Ahmed, 2021. "Modelling and analysis of a hybrid solar dryer for woody biomass," Energy, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:energy:v:216:y:2021:i:c:s036054422032394x
    DOI: 10.1016/j.energy.2020.119287
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    2. Baibhaw Kumar & Gábor Szepesi & Zoltán Szamosi & Gyula Krámer, 2023. "Analysis of a Combined Solar Drying System for Wood-Chips, Sawdust, and Pellets," Sustainability, MDPI, vol. 15(3), pages 1-17, January.
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    4. Hao, Wengang & Liu, Shuonan & Lai, Yanhua & Wang, Mingtao & Liu, Shengze, 2022. "Research on drying Lentinus edodes in a direct expansion heat pump assisted solar drying system and performance of different operating modes," Renewable Energy, Elsevier, vol. 196(C), pages 638-647.

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