Comparative analysis of charcoal-starch composite as a heat absorber in solar drying of water yam (Dioscorea alata)

IF 6 2区 工程技术 Q2 ENERGY & FUELS
M.C. Ndukwu , M.F. Umunna , T.E. Erokare , Elijah Ugwu , Adindu Linus–Chibuezeh , Leonard Akuwueke , Ogochukwu Umeh , Santiago Septien Stringel , Augustine Edet Ben , N.R. Nwakuba , F.I Abam , Hongwei Wu , M. Simo-Tagne
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引用次数: 0

Abstract

The objective of this study is to assess the feasibility of replacing the aluminium-plate absorber, which carries high embodied energy, with an environmentally friendly charcoal-based alternative in solar dryer design. Therefore, two solar dryers with aluminium-plated absorber (SDAPA) and charcoal bed absorber (SDCBA) were developed, and their thermodynamic performance and drying kinetics were compared for drying water yam. SDAPA raised the inlet air temperature by 2.1–6.3 °C, while it was 1.4–6.3 °C for SDCBA. The average thermal efficiencies were 44.93 % for SDAPA and 44.77 % for SDCBA, with an average heat utilization ratio of 46 % and 43 %, respectively. Drying water yam from initial moisture content of 69.45 %wb to 7.41 ± 0.32 % took 16 h for SDAPA, 17 h for SDCBA, and 24 h for sun-drying with average effective moisture diffusivities of 4.51 × 10−10, 3.3 × 10−10, and 2.56 × 10−10 m2/s, respectively. The specific energy utilisation varied from 0.239 to 14.07 W/kg for SDAPA and 0.37 to 15.07 W/kg for SDCBA. The SDCBA mitigated 6782.404 tons of CO2 per year, translating to $98,344.87 in earned carbon credits, while it was 6465.87 tons and $93,755.12 for SDAPA. Modified Henderson and Pabis model best fitted the drying curve of water yam. This study demonstrates the potential of charcoal as a sustainable alternative to aluminium-plate as an absorber in solar dryers.
炭-淀粉复合吸热剂在薯蓣太阳能干燥中的对比分析
本研究的目的是评估在太阳能干燥器设计中,以环保的木炭基替代品取代铝板吸收体的可行性。为此,研制了镀铝吸收体(SDAPA)和木炭床吸收体(SDCBA)两种太阳能干燥器,并对其干燥山药的热力学性能和干燥动力学进行了比较。SDAPA将进气温度提高了2.1-6.3℃,SDCBA将进气温度提高了1.4-6.3℃。SDAPA和SDCBA的平均热效率分别为44.93%和44.77%,平均热利用率分别为46%和43%。从初始含水率69.45% wb到7.41±0.32%,SDAPA干燥时间为16 h, SDCBA干燥时间为17 h,太阳干燥时间为24 h,平均有效水分扩散系数分别为4.51 × 10−10、3.3 × 10−10和2.56 × 10−10 m2/s。SDAPA的比能量利用率为0.239 ~ 14.07 W/kg, SDCBA的比能量利用率为0.37 ~ 15.07 W/kg。SDCBA每年减少了6782.404吨二氧化碳,相当于获得了98,344.87美元的碳信用额度,而SDAPA的碳信用额度为6465.87吨,93,755.12美元。修正的Henderson和Pabis模型最适合水山药的干燥曲线。这项研究证明了木炭作为太阳能干燥器中铝板吸收剂的可持续替代品的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Solar Energy
Solar Energy 工程技术-能源与燃料
CiteScore
13.90
自引率
9.00%
发文量
0
审稿时长
47 days
期刊介绍: Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass
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