水热法处理太阳能吸收体热稳定性研究

IF 0.9 Q4 GEOCHEMISTRY & GEOPHYSICS Solar-Terrestrial Physics Pub Date : 2022-09-28 DOI:10.3390/solar2040025
S. Abdullahi, R. Akoba, J. Sackey, S. Khamlich, S. Halindintwali, Z. Nuru, M. Maaza
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引用次数: 0

摘要

在这项工作中,我们研究了水热处理不锈钢(SS)选择性太阳能吸收体的热稳定性,方法是在300°C至700°C的温度范围内的空气中退火,浸泡时间为2小时。如果真空被破坏,在空气存在下的热稳定性测试是至关重要的。因此,采用x射线衍射(XRD)、机械和光学技术对SS进行了表征。XRD分析表明,处理后吸收剂的晶粒尺寸为67 nm,而退火后吸收剂的晶粒尺寸在66 ~ 38 nm之间。经热处理和退火后的SS经XRD进一步鉴定为Fe2O3相。EDS结果表明,SS的元素成分为C、Cr、Fe和o。在300-700℃时,处理后的吸收剂的应变(ε)和应力(σ)分别为1.2 × 10−1和−2.9 GPa,而退火后的吸收剂的应变(ε)和应力(σ)分别为4.4 × 10−1 ~ 5.2 × 10−1和−121.6 ~−103.2 GPa。经过热处理的SS吸收剂具有较好的光谱选择性,分别为0.938/0.431 = 2.176,300℃退火后为0.941/0.403 = 2.335,700℃退火后为0.884/0.179 = 4.939。这些结果表明,在300℃退火后,吸收率(0.941)和发射率(0.403)略有改善,在700℃退火后,吸收率和发射率显著下降。得到的分析证实,退火的SS吸收体具有优异的选择性,适用于空气中的任何热条件(≤700°C)。因此,使用本研究中所展示的经济有效的方法,经过处理和退火的SS吸收剂可用于光热转换应用。
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Investigation of the Thermal Stability of a Solar Absorber Processed through a Hydrothermal Technique
In this work, we study the thermal stability of a hydrothermally treated stainless steel (SS) selective solar absorber by annealing in air in a temperature range between 300 °C and 700 °C for a soaking time of 2 h. Thermal stability testing in the presence of air is critical if the vacuum is breached. Therefore, the SS was characterized by X-ray diffraction (XRD), mechanical, and optical techniques. The XRD analysis shows that the grain size of the as-treated absorber is 67 nm, whereas those of the annealed absorbers were found to be in the range between 66 and 38 nm. The phase of the as-treated and annealed SS was further identified by XRD as Fe2O3. The EDS result shows that the elemental components of the SS were C, Cr, Fe, and O. The strain (ε) and stress (σ) calculated for the as-treated absorber are 1.2 × 10−1 and −2.9 GPa, whereas the annealed absorbers are found in the range of 4.4 × 10−1 to 5.2 × 10−1 and −121.6 to −103.2 GPa, respectively, at 300–700 °C. The as-treated SS absorbers exhibit a good spectra selectivity of 0.938/0.431 = 2.176, which compares with 0.941/0.403 = 2.335 after being annealed at 300 °C and 0.884/0.179 = 4.939 after being annealed at 700 °C. These results indicate a small improvement in absorptivity (0.941) and emissivity (0.403) after annealing at 300 °C, followed by a significant decrease after annealing at 700 °C. The obtained analysis confirms that the annealed SS absorber exhibits excellent selectivity and is suitable to withstand any thermal condition (≤700 °C) in air. Thus, using a cost-effective approach as demonstrated in this study, the as-treated and annealed SS absorber could be used for photo-thermal conversion applications.
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来源期刊
Solar-Terrestrial Physics
Solar-Terrestrial Physics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
9.10%
发文量
38
审稿时长
12 weeks
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