Energy and quality analysis of forced convection air-energy assisted solar timber drying

Xiang Chi, Sai Tang, Xiaoxue Song, Sohrab Rahimi, Zechun Ren, Guangping Han, Sheldon Q. Shi, Wanli Cheng and Stavros Avramidis

Energy, 2023, vol. 283, issue C

Abstract: Discontinuities due to weather conditions and daylight affect solar drying, so to address that, a working mechanism of air energy-assisted solar drying was developed in this study. An air-energy assisted solar dryer was used to dry timber, from a green average moisture content of 183%–11.3% in 161.5 h, where the moisture diffusion coefficient ranged from 1.28 ×10-10 m2/s to 6.41 ×10-9 m2/s. The effective solar radiation intensity during drying ranged from 221.3 to 750.3 W/m2. The overall drying efficiency was 30.7%, and the effective solar heat supply ratio was 58.5%. The specific moisture extraction rate and specific energy consumption were measured within a range of 0.32–3.0 kg/kWh and 924 - 11390 kJ/kg, respectively. The average power consumption per m3 of wood volume was 254.2 kW h/m3. The results showed that the energy-assisted solar dryer was suitable for a condition with low radiation and various weather conditions.

Keywords: Air energy-assisted solar dryer; Porous material; Moisture diffusion coefficient; Drying efficiency; Energy efficiency (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:283:y:2023:i:c:s0360544223021126

DOI: 10.1016/j.energy.2023.128718

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