Performance evaluation of greenhouse solar dryer: Energy-exergy analysis, CFD simulation and eco-environmental assessment

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-19 DOI:10.1016/j.renene.2024.121946

Ali Daliran, Morteza Taki, Afshin Marzban, Majid Rahnama, Rouhollah Farhadi

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Abstract

Solar greenhouse drying is considered a useful solar dryer technology for tropical and subtropical countries. This study examined a Quonset Solar Greenhouse Dryer (QSGD) with a parabolic roof and polycarbonate sheets on a 2.47 × 6.0 m² concrete floor, ventilated by two 220-V AC fans. The drying kinetics of mint leaves, energy-exergy analysis, Computational Fluid Dynamics (CFD) validation, economic viability and environmental impact were investigated. Mint leaves were dried from 85 % to 10 % moisture content in 3.5 h. The QSGD's energy and exergy efficiencies were 32 % and 22 %, respectively. The Discrete Ordinates (DO) radiation model simulated the effect of solar radiation inside the greenhouse dryer and the K-e model was used to account for the turbulent airflow. CFD 3-D simulations using ANSYS FLUENT ver.21 showed uniform temperature and airflow distribution, with good agreement between experimental and theoretical results. The outlet temperature ranged from 30 to 48 °C (experimental) and 34–50 °C (simulation) and also, higher air velocities were noted at the inlet and outlet. Environmental assessment revealed embodied energy of 47224.8 kWh, CO₂ emissions of 9.7 tons and net CO₂ mitigation of 130.7 tons over its lifetime. The Energy Payback Time (EPBT) and Payback Period (PBP) were 3.1 and 1.64 years, respectively.

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温室太阳能干燥机的性能评估：能耗分析、CFD 模拟和生态环境评估

太阳能温室干燥被认为是热带和亚热带国家的一种有用的太阳能干燥技术。本研究考察了一种 Quonset 太阳能温室干燥器（QSGD），它的抛物线屋顶和聚碳酸酯板位于 2.47 × 6.0 平方米的混凝土地面上，由两个 220 伏交流风扇通风。对薄荷叶的干燥动力学、能耗分析、计算流体动力学（CFD）验证、经济可行性和环境影响进行了研究。薄荷叶在 3.5 小时内从含水量 85% 干燥到含水量 10%，QSGD 的能效和放能效分别为 32% 和 22%。离散顺序（DO）辐射模型模拟了温室干燥器内的太阳辐射效应，K-e 模型用于解释湍流气流。使用 ANSYS FLUENT ver.21 进行的 CFD 三维模拟显示，温度和气流分布均匀，实验结果与理论结果吻合良好。出口温度范围为 30 至 48 °C（实验结果）和 34 至 50 °C（模拟结果），此外，在入口和出口处还发现了较高的气流速度。环境评估结果表明，在其整个使用周期内，体现能源为 47224.8 千瓦时，二氧化碳排放量为 9.7 吨，二氧化碳净减排量为 130.7 吨。能源回收期（EPBT）和投资回收期（PBP）分别为 3.1 年和 1.64 年。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

期刊介绍： Renewable Energy journal is dedicated to advancing knowledge and disseminating insights on various topics and technologies within renewable energy systems and components. Our mission is to support researchers, engineers, economists, manufacturers, NGOs, associations, and societies in staying updated on new developments in their respective fields and applying alternative energy solutions to current practices. As an international, multidisciplinary journal in renewable energy engineering and research, we strive to be a premier peer-reviewed platform and a trusted source of original research and reviews in the field of renewable energy. Join us in our endeavor to drive innovation and progress in sustainable energy solutions.