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Photovoltaic cooling techniques’ effect on the average monthly performance 光伏冷却技术对月平均性能的影响
Q3 Engineering Pub Date : 2024-03-04 DOI: 10.21014/actaimeko.v13i1.1660
Antonino Rollo, Vittorio Ferraro, Piero Bevilacqua
Nowadays, mitigating climate-altering emissions resulting from air conditioning and mechanical ventilation of indoor spaces is of utmost importance. Encourage the adoption of renewable energy sources for power generation is a critical approach in this regard. Among the available technologies, photovoltaic technology stands as the most mature option. However, it does have limitations, such as reduced efficiency and performance degradation at elevated temperatures. To enhance the efficiency of photovoltaic systems, various solutions have been proposed over time, with significant research focusing on the exploration of new materials. One of the most promising solutions involves panel cooling through the utilization of external fluids, either in a forced or natural manner. Furthermore, the extracted heat from this cooling process can be effectively reused in other industrial processes, adding to its appeal. Nonetheless, despite its potential, the application of panel cooling technology is relatively recent, and assessing its suitability in specific scenarios at an early stage can be challenging. Currently, there is a lack of clear and straightforward methodologies to evaluate the performance gains achievable through the implementation of panel cooling. The primary objective of this research is to present an innovative methodology that can effectively assess panel cooling efficiency on an average daily-monthly basis. Specifically, we propose corrective parameters that modify the widely used Siegel method, which determines the monthly average daily efficiency of uncooled panels. Throughout the study, it has become evident that the input values derived from the UNI standard do not fully represent the real-world conditions. This finding may indicate the necessity for regulatory updates to accurately account for the practical operational environment.
如今,减少室内空间的空调和机械通风所产生的改变气候的排放至关重要。鼓励采用可再生能源发电是这方面的一个重要方法。在现有技术中,光伏技术是最成熟的选择。不过,它也有局限性,如效率降低和高温下性能下降。为了提高光伏系统的效率,人们提出了各种解决方案,其中重要的研究重点是探索新材料。最有前途的解决方案之一是利用外部流体(强制或自然方式)对面板进行冷却。此外,从冷却过程中提取的热量可以有效地重新用于其他工业流程,这也增加了它的吸引力。然而,尽管面板冷却技术潜力巨大,但其应用却相对较晚,在早期阶段评估其在特定场景中的适用性可能具有挑战性。目前,还缺乏清晰、直接的方法来评估通过实施板式冷却技术可实现的性能提升。本研究的主要目的是提出一种创新方法,可有效评估面板冷却的日均效率。具体来说,我们提出了修正参数,以修改广泛使用的西格尔方法,该方法可确定未冷却面板的月平均日效率。在整个研究过程中,我们发现根据 UNI 标准得出的输入值并不能完全代表实际情况。这一发现可能表明,有必要进行法规更新,以准确反映实际运行环境。
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引用次数: 1
Performance evaluation of a spark ignition engine using gasoline and essential oil fuel blend 使用汽油和精油混合燃料的火花点火发动机性能评估
Q3 Engineering Pub Date : 2024-03-04 DOI: 10.21014/actaimeko.v13i1.1687
M. Paloboran, Thesya Atarezcha Pangruruk, Mustari Lamada, Zulhajji Z., H. H. Latang, Slamet Widodo
Clove oil is an essential oil that has recently been used not only as a health or aromatherapy ingredient but is also widely used as an additive in fuel, especially for compression ignition engines. Essential oils are extracted through distillation from various parts of the clove tree, such as flowers, tree bark, leaves, and even fruit. This study aims to evaluate the combustion performance of a spark-ignition engine fueled by gasoline and essential oil at a concentration of 5-20 % as a blend. This type of research has not been conducted by many researchers, making it difficult to find scientific references related to this type of research. Experiments carried out on a research engine with engine speed variations of 1400–1800 rpm and a constant load of 3 kg. The results show that increasing the essential oil content increases the fuel energy and indicative power, thereby increasing the thermal efficiency. However, the brake power will decrease because most of it is lost owing to heat transfer and friction; therefore, the mechanical efficiency decreases if the percentage of essential oil in gasoline increases. Meanwhile, increased essential oils will reduce CO2 emissions, but HC and CO emissions will increase, especially at high engine speeds.
丁香油是一种精油,近来不仅被用作保健或芳香疗法成分,还被广泛用作燃料添加剂,尤其是用于压燃式发动机。精油是从丁香树的不同部位(如花、树皮、叶子甚至果实)通过蒸馏提取的。本研究旨在评估火花点火发动机的燃烧性能,其燃料为浓度为 5-20% 的汽油和精油混合物。目前还没有很多研究人员进行过此类研究,因此很难找到与此类研究相关的科学参考文献。在一台研究型发动机上进行了实验,发动机转速变化为 1400-1800 转/分钟,负载为 3 公斤。结果表明,增加精油含量可提高燃料能量和指示功率,从而提高热效率。然而,制动功率会下降,因为大部分制动功率会因热传导和摩擦而损失;因此,如果汽油中的精油比例增加,机械效率就会下降。同时,增加精油会减少 CO2 排放,但 HC 和 CO 排放会增加,尤其是在发动机高速运转时。
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引用次数: 1
IoT sensor nodes for air pollution monitoring: A review 用于空气污染监测的物联网传感器节点:综述
Q3 Engineering Pub Date : 2023-12-28 DOI: 10.21014/actaimeko.v12i4.1676
Rocío Alejandra Guerrón, Francesco D’Amore, M. Bencardino, Francesco Lamonaca, Antonio Colaprico, Marco Lanuzza, R. Taco, D. L. Carní
Air quality is an important environmental concern, as it is strictly related to human health risks and adverse eff ects on it. Monitoring air pollutants and diff erent ancillary parameters is a feasible and crucial approach to address this challenge. This task typically involves high expenses in case measurements are carried out by using conventi onal measurement instruments and human operators. However, uti lizing measurement systems with low-cost sensors can reduce the overall implementati on eff ort. The aim of this paper is to describe the sensor node architecture applicable to a general monitoring system and based on this structure, review diff erent current low-cost measurement system proposals for outdoor air quality monitoring.
空气质量是一个重要的环境问题,因为它与人类健康风险和不利影响密切相关。监测空气污染物和不同的辅助参数是应对这一挑战的可行且重要的方法。如果使用常规测量仪器和人工操作进行测量,这项任务通常需要高昂的费用。然而,利用带有低成本传感器的测量系统可以降低总体实施效率。本文的目的是描述适用于一般监测系统的传感器节点结构,并在此结构的基础上综述目前用于室外空气质量监测的各种低成本测量系统建议。
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引用次数: 0
Introductory notes for the Acta IMEKO fourth issue 2023 Acta IMEKO 第 4 期 2023 的介绍性说明
Q3 Engineering Pub Date : 2023-12-28 DOI: 10.21014/actaimeko.v12i4.1737
Francesco Lamonaca
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引用次数: 0
Modeling and simulation of dew point temperature generated by a bubble aerator 气泡曝气器产生的露点温度建模与模拟
Q3 Engineering Pub Date : 2023-12-24 DOI: 10.21014/actaimeko.v12i4.1568
Arfan Sindhu Tistomo, Aditya Achmadi, Melati Azizka Fajria, S. Viridi, Muhammad Miftahul Munir, S. Suprijadi
The dew point temperature can be generated by saturating air with water vapor through several methods, one of which is by creating small-sized air bubbles passed through water in an enclosed space known as a saturator. In practical terms, the dew point temperature produced by this system can be determined by measuring it using a dew point meter. However, the prediction of the dew point temperature generated through theoretical approaches has not been presented before. Thus, in this study, a simulation has been conducted to determine the dew point temperature. The result is then compared to the experimental data. The experiment follows the single pressure humidity generator principle, where a saturator containing a bubble aerator is immersed in a stirred liquid bath. The bath temperature is set to 25 °C, and the gas flow rate is adjusted from 0.1 lpm to 0.4 lpm. The dew point temperature is measured using a 373 LHX chilled mirror dew point meter. On the other hand, the simulation is performed using the Monte Carlo method, and the physical model involves a heat balance between convection and the change in bubble energy. The convection heat transfer coefficient is determined by the behavior of bubble dynamics, which is related to the bubble size and bubble velocity. The dew point temperature obtained from the simulation is assumed to be the same as the bubble temperature. As a result, the simulation data align well with the experimental data.
露点温度可以通过几种方法使空气中的水蒸气达到饱和而产生,其中一种方法是在一个被称为饱和器的封闭空间中产生通过水的小气泡。在实际应用中,可以使用露点仪测量该系统产生的露点温度。然而,通过理论方法预测产生的露点温度之前还没有人提出过。因此,本研究通过模拟来确定露点温度。然后将结果与实验数据进行比较。实验遵循单压湿度发生器原理,将包含气泡曝气器的饱和器浸入搅拌液浴中。浴槽温度设定为 25 °C,气体流速从 0.1 升/分钟调整到 0.4 升/分钟。露点温度使用 373 LHX 冷镜露点仪测量。另一方面,模拟采用蒙特卡罗方法,物理模型包括对流和气泡能量变化之间的热平衡。对流传热系数由气泡动力学行为决定,与气泡大小和气泡速度有关。模拟得到的露点温度假定与气泡温度相同。因此,模拟数据与实验数据非常吻合。
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引用次数: 0
Introductory notes for the Acta IMEKO thematic issue on Measurements and Applications in Veterinary and Animal Sciences 兽医和动物科学中的测量与应用》(Acta IMEKO)专题介绍说明
Q3 Engineering Pub Date : 2023-12-24 DOI: 10.21014/actaimeko.v12i4.1736
Leopoldo Angrisani, Francesco Lamonaca, Gianluca Neglia
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引用次数: 0
A methodological approach towards the bio-inspired design of novel scaffolds for tissue engineering 从生物启发角度设计新型组织工程支架的方法论
Q3 Engineering Pub Date : 2023-12-22 DOI: 10.21014/actaimeko.v12i4.1717
Pierpaolo Fucile, Francesco Lamonaca, Antonio Gloria, Lorenzo Moroni
The design of scaffolds for multi-tissue regeneration is very complex in terms of material and structure, as a direct consequence of hierarchical and organizational features. TRIZ represents the Russian acronym for the “Theory of Inventive Problem Solving” (TIPS). TRIZ is able to identify and codify such principles, using them to make the creative process more predictable. It is a methodology for the identification of the system conflicts and contradictions in order to solve the inventive problems. Its multidisciplinary features and the general approach to product design can make TRIZ as an intriguing starting point for the biomimetic approach in a systematic and organized way. Biomimetics aims at a complete integration between nature and technology. In this scenario, BioTRIZ shares the contradiction resolution method of the Altshuller’s theory, representing a systematic biomimetic approach towards the product design. In the current study, BioTRIZ was considered to systematize the process of bio-inspired design of 3D optimized scaffolds for the regeneration of complex tissue defects. A device for the regeneration of osteochondral tissue defects was considered as a case study. The technical solutions involved the design of a two-compartment, hybrid and functionally graded scaffold.
多组织再生支架的设计在材料和结构方面非常复杂,这是分层和组织特征的直接结果。TRIZ 是俄语 "创造性问题解决理论"(TIPS)的缩写。TRIZ能够识别和编纂这些原则,利用它们使创造过程更具可预测性。它是一种识别系统冲突和矛盾以解决发明问题的方法。TRIZ 的多学科特点和产品设计的一般方法可以使其成为有系统、有组织地采用生物仿生方法的一个令人感兴趣的起点。生物仿生学旨在实现自然与技术的完全融合。在这种情况下,BioTRIZ与Altshuller理论中的矛盾解决方法相同,代表了一种系统的产品设计生物仿生方法。在当前的研究中,BioTRIZ 被认为是将三维优化支架的生物启发设计过程系统化,用于复杂组织缺损的再生。研究以一种用于骨软骨组织缺损再生的装置为案例。技术解决方案包括设计一种双室、混合和功能分级支架。
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引用次数: 0
Time stability of the dynamic behaviour of a 3D-printed airless wheel by stereolithography 通过立体光刻技术三维打印无气车轮动态行为的时间稳定性
Q3 Engineering Pub Date : 2023-12-21 DOI: 10.21014/actaimeko.v12i4.1693
Alessandro Annessi, A. Quattrocchi, Simone Pasinetti, M. Martarelli, P. Chiariotti, P. Castellini, Gianluca Rossi, Roberto Montanini
In this paper, the dynamic behavior of an airless wheel made by additive manufacturing is investigated. A lattice geometry is chosen as the cyclic pattern from which the wheel is built. Initially, a linear numerical model is used to preliminarily assess resonance frequency and mode shapes of the wheel. Afterwards, specimens were tested twice, in August 2020 and after six months, highlighting a relevant frequency and damping shift in the vibrational response. To better understand the reason behind the change over time in the wheel dynamic behavior, dedicated structural dynamics tests at varying temperature and humidity set points were performed in an environmental chamber, consisting in measuring the wheel vibrational response when subjected to temperature and humidity variation.
本文研究了通过快速成型技术制造的无气车轮的动态特性。车轮的循环模式选择晶格几何形状。首先,使用线性数值模型来初步评估轮子的共振频率和模态振型。随后,分别于 2020 年 8 月和 6 个月后对试样进行了两次测试,结果表明振动响应中存在相关的频率和阻尼变化。为了更好地了解车轮动态行为随时间变化的原因,在环境试验室中进行了不同温度和湿度设定点下的专用结构动力学试验,包括测量车轮在温度和湿度变化时的振动响应。
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引用次数: 0
Generative design and insights in strategies for the development of innovative products with tailored mechanical and/or functional properties 开发具有定制机械和/或功能特性的创新产品的生成设计和战略见解
Q3 Engineering Pub Date : 2023-12-21 DOI: 10.21014/actaimeko.v12i4.1716
Ida Papallo, M. Martorelli, Francesco Lamonaca, Antonio Gloria
Creative design methods should allow the extraction of novel wisdoms and favour their integration into many technological domains, thus leading to an innovative product. The current research reports some technical considerations on the role of generative design as a “collaborative partner” in supporting the ideation process through the development of design alternatives in agreement with the designer’s criteria. A specific case study was considered and the role of the generative design method was stressed, also focusing on technical features and differences in terms of solutions for the given design problem. The possibility of selecting well defined manufacturing methods (e.g., traditional or advanced – additive manufacturing) was highlighted.
创造性设计方法应允许提取新的智慧,并有利于将其融入许多技术领域,从而产生创新产品。当前的研究报告从技术上探讨了生成设计作为 "协作伙伴 "在支持构思过程中的作用,即通过开发符合设计师标准的设计方案来支持构思过程。研究人员考虑了一个具体的案例研究,强调了生成设计方法的作用,同时还关注了技术特点以及特定设计问题解决方案的差异。强调了选择定义明确的制造方法(如传统或先进的增材制造)的可能性。
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引用次数: 0
Clothing, textile, and fashion industry sustainability impact measurement and management 服装、纺织和时尚产业可持续性影响的测量和管理
Q3 Engineering Pub Date : 2023-12-21 DOI: 10.21014/actaimeko.v12i4.1336
Tal Madhala, William Fisher
Data from the Kering Group's 2018 Environmental Profit and Loss (EP&L) statement were examined for their capacity to meet the demand for meaningful and manageable sustainability metrics. Significant resources were invested in creating the data reported in this EP&L statement, as Kering's operations in 104 countries were evaluated in ways separable into almost 1,500 different indicators. The data system was not, however, designed as a measurement system. That is, it was not set up as specifically positing the possibility of estimating separable parameters for comparing company location performances across sustainability challenges. Of particular importance is the lack of information in the EP&L on the overall consistency of the data reported, on the uncertainties associated with the metrics given, and on the meaningfulness of comparisons across environmental impacts, processes, and materials. The results reported here showing far from perfect data consistency and large uncertainties comprise an effort at constructing meaningful measurements that offers important lessons for the redesign of the data and reporting system.
我们对 Kering 集团 2018 年环境损益表(EP&L)中的数据进行了研究,以确定这些数据是否能够满足对有意义且可管理的可持续发展指标的需求。在创建这份环境损益表中报告的数据时投入了大量资源,因为 Kering 在 104 个国家的运营情况被评估为近 1500 个不同的指标。然而,数据系统并不是作为衡量系统设计的。也就是说,该数据系统并不是专门为估算可分离参数的可能性而设计的,这些参数可用于比较公司所在地在可持续发展方面的表现。尤为重要的是,环境影响评估和报告中缺乏以下方面的信息:所报告数据的整体一致性、与给出的指标相关的不确定性,以及对不同环境影响、流程和材料进行比较的意义。本文报告的结果表明,数据的一致性远非完美,不确定性也很大,这是为构建有意义的衡量标准所做的努力,为数据和报告系统的重新设计提供了重要经验。
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引用次数: 0
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Acta IMEKO
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