2024年11月28日，Elsevier旗下国际著名期刊《Renewable Energy》在线发表了云南师范大学能源与环境科学学院王云峰教授课题组的最新研究成果《Machine learning, mathematical modeling and 4E (energy, exergy, environmental, and economic) analysis of an indirect solar dryer for drying sweet potato》。云南师范大学能源与环境科学学院王云峰教授为第二单位兼通讯作者，第一作者单位为北京理工大学（Beijing Institute of Technology），通讯作者为北京理工大学宋孟杰教授。合作单位有韩国汉阳大学、阿尔及利亚可再生能源发展中心、开罗大学（Cairo University）、法尤姆大学（Fayuom University）

The thermal performances and quality attributes of dried onion using stationary solar-electric drying (SED), intermittent solar-electric drying (ISED), and intermittent solar-electric drying with sensible storage medium (ISEDS) were compared. The tempering in processing time by 60 min elevated the drying time and reduced the diffusivity from 3.67 × 10−6 m2/s using SED to 2.06 × 10−6 and 2.11 × 10−6 m2/s using the ISED and ISEDS, respectively. The obtained drying efficiency was 21.05 %, 35.69 %, and 35.39 %, respectively, for the SED, ISED, and ISEDS. The average SEC values were found at 0.76 and 0.66 kWh/kg using ISED and ISEDS, respectively. The sustainability index (Si) and waste exergy ratio (WER) values were Si = 1.99, 1.45, and 1.51 and WER = 0.49, 0.63, and 0.61, respectively for SED, ISED, and ISEDS. The improvement potential (IP) of 1.69, 1.84, and 1.74 W were obtained using SED, ISED, and ISEDS, respectively. For SED, ISED, and ISEDS, the payback period (Pb) values were estimated at 1.08, 0.75, and 0.70 years, with the highest annual savings (Sj) obtained using the ISEDS at 16203.3 CNY. Better visual quality was observed for ISEDS. Compared to stationary drying processes using high-extensive energy dryers, intermittent solar drying is a promising technique for preserving agri-food products.

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