1,721,039 research outputs found
Research funded by EU in thermal energy storage: Outcomes from the Eurotherm Seminar #116 and role of the European Innovation Council
No full texteditoria
Preface for special issue: Energy storage and Enerstock 2021 “Towards Smarter Solutions”
Full text linkPreface for special issue: Energy storage and Enerstock 2021 “Towards Smarter Solutions”, which gathers a selection of articles following contributions presented at the 15th International Conference on Energy Storage ENERSTOCK 2021, which was held “virtually” in June 9–11, 2021 in Ljubljana, Slovenia
Boosting the clean energy transition through data science
Full text linkThe demand for research supporting the development of new policy frameworks for energy saving and conservation has never been more critical. As climate change accelerates and its impacts become increasingly severe, the need for sustainable and resilient socioeconomic systems is increasingly pressing. In response to this global challenge, the ten articles of this special issue seek to explore how advances in Artificial Intelligence and Data Science can drive the energy transition and enhance environmental sustainability
Thermo-economic optimization of a multi-source (air/sun/ground) residential heat pump with a water/PCM thermal storage
No full textThe main target of this paper is to numerically study a multi-source (air/sun/ground) heat pump with the implementation of a thermal energy storage, using either water or PCM, for residential space heating. The system was modelled considering several sub-models for each of the components (compressor, solar panels, storage tank, heat exchangers etc.). A control strategy has been established to decide which operating mode of the system provides the highest coefficient of performance (COP). A multi-objective optimization through genetic algorithm of several decisional variables of the system was carried out, in different configurations and climate conditions, by considering different scenarios in terms of total investment and energy consumption costs, to optimize seasonal performances and investment cost of the entire system. Results show that solar thermal and solar photovoltaic collectors coupled with water storage tank give higher seasonal energy performance, especially in warmer climates, whereas the exploitation of the ground source can be more advantageous for colder climates. From the optimization analysis, it results that optimal non-dominated solutions characterized by a SCOP increase between 50% and 250% are characterized by higher investment costs between 215% and 730%, depending on the climate conditions. None of the solutions employing a PCM storage tank results economically feasible, due to a slight effect on system performance, and a much higher effect on investment costs. Finally, several cost scenarios in terms of incentives on investment costs and increased energy prices were analysed, for which the employment of scenarios with higher capital investment can be more advantageous in terms of lower total costs
Recent trends on liquid air energy storage: A bibliometric analysis
No full textThe increasing penetration of renewable energy has led electrical energy storage systems to have a key role in balancing and increasing the efficiency of the grid. Liquid air energy storage (LAES) is a promising technology, mainly proposed for large scale applications, which uses cryogen (liquid air) as energy vector. Compared to other similar large-scale technologies such as compressed air energy storage or pumped hydroelectric energy storage, the use of liquid air as a storage medium allows a high energy density to be reached and overcomes the problem related to geological constraints. Furthermore, when integrated with high-grade waste cold/waste heat resources such as the liquefied natural gas regasification process and hot combustion gases discharged to the atmosphere, LAES has the capacity to significantly increase the round-trip efficiency. Although the first document in the literature on the topic of LAES appeared in 1974, this technology has gained the attention of many researchers around the world only in recent years, leading to a rapid increase in a scientific production and the realization of two system prototype located in the United Kingdom (UK). This study aims to report the current status of the scientific progress through a bibliometric analysis, defining the hotspots and research trends of LAES technology. The results can be used by researchers and manufacturers involved in this entering technology to understand the state of art, the trend of scientific production, the current networks of worldwide institutions, and the authors connected through the LAES. Our conclusions report useful advice for the future research, highlighting the research trend and the current gaps
Thermo-acoustic and mechanical characterization of novel bio-based plasters: The valorisation of lignin as by-product from biomass extraction for green building applications
No full textEvery day a wide amount of wastes is generated and landfilled, without giving them any new use. Among these wastes, biomass gathered from nature, as agricultural or forest wastes are found. From collecting and treating this biomass, a new composite can be obtained, reducing its environmental footprint. In this context, the present study focuses on the use of lignin produced from a bio-residue collected from the Trasimeno lake (Italy), to form gypsum-based plasters for building applications. Several compositions were formulated considering two types of gypsum, different in purity and mechanical strength. The goal was to maximize the lignin content in a gypsum matrix maintaining acceptable mechanical and thermo-physical performance. Lignin weight contents ranging from 0% (100% gypsum) to 100% (0% gypsum) were taken into account, considering also the proportions: 30–70%, 50–50%, 70–30%. Thermo-acoustic and mechanical characterization of these materials was carried out for the first time. Results showed that the thermal conductivity of the composites was closer to the only-lignin ones, resulting in promising thermal insulation results for building application. However, from an acoustical point of view, when increasing the lignin content, acoustic insulation decreased. In terms of mechanical performance, gypsum building plaster exhibited an improved performance with 50 and 70% lignin content, significantly outperforming all other studied gypsums
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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