Feasible study of chemical oxidized SS304 sheets as solar selective absorbers for flat plate collectors & performance validation in solar water heater systems

IF 6.3 2区 材料科学 Q2 ENERGY & FUELS
Md Nishar, K.K. Phani Kumar, S.R. Atchuta, Shanmugasundaram Sakthivel
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Abstract

Solar water heater (SWH) systems play a crucial role in utilizing renewable solar energy for domestic hot water generation, offering a sustainable alternative to conventional heating methods. Flat plate collectors (FPCs), a widely used configuration in SWH systems, rely heavily on the efficiency of the absorber surface to maximize solar energy capture and minimize thermal losses. In this study, a cost-effective and scalable solution was developed using chemically oxidised stainless steel 304 (SS 304) sheets as the absorber material for flat plate collectors. The chemically treated SS 304 surfaces exhibited a nanoporous oxide morphology, which significantly enhanced light trapping and solar radiation absorption. Optimised samples demonstrated high solar absorptance (α) in the range of 0.89–0.91 and low thermal emittance (ε) between 0.20 and 0.30, indicating a favorable balance for efficient solar thermal conversion. To ensure practical applicability, the chemical oxidation process was scaled up to coat 2-m-long SS 304 sheets, which were used to build a 1 × 2-m flat plate collector integrated into a thermosiphon-based solar water heater. Repeatable field tests showed an average thermal efficiency of 37.3 %, with low uncertainty less than 2 %. Multiple real field testing under different solar radiation conditions confirmed the consistency and durability of the coating performance. The findings underscore the potential of this low-cost, scalable approach for large-scale solar thermal applications, particularly in regions where affordability and ease of fabrication are critical.
化学氧化SS304薄板作为平板集热器太阳能选择性吸收体的可行性研究及在太阳能热水器系统中的性能验证
太阳能热水器(SWH)系统在利用可再生太阳能生产家庭热水方面发挥着至关重要的作用,为传统的加热方法提供了一种可持续的替代方案。平板集热器(FPCs)是SWH系统中广泛使用的一种配置,它在很大程度上依赖于吸收器表面的效率来最大化太阳能捕获和最小化热损失。在这项研究中,开发了一种具有成本效益和可扩展的解决方案,使用化学氧化304不锈钢(SS 304)片作为平板收集器的吸收材料。经过化学处理的SS 304表面呈现出纳米孔氧化物形态,显著增强了光捕获和太阳辐射吸收。优化后的样品在0.89 ~ 0.91范围内具有较高的太阳吸收率(α),在0.20 ~ 0.30范围内具有较低的热发射率(ε),表明该样品具有良好的太阳能热转换平衡。为了确保实际应用,化学氧化过程被扩大到覆盖2米长的SS 304板,用于构建一个1 × 2米的平板集热器,该集热器集成到基于热虹吸的太阳能热水器中。可重复的现场测试表明,平均热效率为37.3%,不确定度低于2%。在不同太阳辐射条件下进行了多次实地试验,验证了涂层性能的一致性和耐久性。这一发现强调了这种低成本、可扩展的方法在大规模太阳能热应用中的潜力,特别是在价格合理、易于制造的地区。
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来源期刊
Solar Energy Materials and Solar Cells
Solar Energy Materials and Solar Cells 工程技术-材料科学:综合
CiteScore
12.60
自引率
11.60%
发文量
513
审稿时长
47 days
期刊介绍: Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.
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