1,721,017 research outputs found
Risk-based constraints for the optimal operation of an energy community
No full textsponsorship: This work was supported in part by the Strategic Basic Research (SBO) under Grant S006718N provided by the Research Foundation-Flanders (FWO), and in part by the University of Leuven's C2 Research Project C24/16/018 entitled "Energy Storage as a Disruptive Technology in the Energy System of the Future." Paper no. TSG-01833-2021. (Strategic Basic Research (SBO) by the Research Foundation-Flanders (FWO)|S006718N, University of Leuven's C2 Research Project|C24/16/018)status: Published onlin
Integrated modeling of active demand response with electric heating systems coupled to thermal energy storage systems
Get PDFActive Demand Response (ADR) can contribute to a more cost-efficient operation of, and investment in,
the electric power system as it may provide the needed flexibility to cope with the intermittent character
of some forms of renewables, such as wind. One possibly promising group of demand side technologies in
terms of ADR are electric heating systems. These systems could allow to modify their electrical load pattern
without affecting the final, thermal energy service they deliver, thanks to the thermal inertia in the
system. One of the major remaining obstacles for a large scale roll-out of ADR schemes is the lack of a
thorough understanding of interactions between the demand and supply side of the electric power system
and the related possible benefits for consumers and producers. Therefore, in this paper, an integrated
system model of the electric power system, including electric heating systems (heat pumps and auxiliary
resistance heaters) subjected to an ADR scheme, is developed, taking into account the dynamics and constraints
on both the supply and demand side of the electric power system. This paper shows that only
these integrated system models are able to simultaneously consider all technical and comfort constraints
present in the overall system. This allows to accurately assess the benefits for, and interactions of,
demand and supply under ADR schemes. Furthermore, we illustrate the effects not captured by traditional,
simplified approaches used to represent the demand side (e.g., price elasticity models and virtual
generator models) and the supply side (e.g., electricity price profiles and merit order models). Based on
these results, we formulate some conclusions which may help modelers in selecting the approach most
suited for the problem they would like to study, weighing the complexity and detail of the model
Active demand response with electric heating systems: Impact of market penetration
Get PDFActive demand response(ADR)is a powerful instrument among electric demand side management strategies to influence the customers' load shape. Assessing the real potential of
ADR programmes in improving the performance of the electric power system is a complex task, due to the strict interaction between supply and demand for electricity, which requires integrated modelling tools. In this paper an analysis is performed aimed at evaluating the benefits of ADR programmes in terms of electricity consumption and operational costs,both from the final user's and the overall system's perspective. The demand side technologies
considered are electric heating systems (i.e. heat pumps and electric resistance heaters)coupled with thermal energy storage (i.e. the thermal mass of the building envelope and
the domestic hot water tank). In particular, the effect of the penetration rate of ADR programmes among consumers with electric heating systems is studied. Results clearly show
that increasing the number of participating consumers increases the exibility of the system and, therefore, reduces the overall operational costs. On the other hand, the benefit per individual participant decreases in the presence of more ADR-adherent consumers since a reduced effort from each consumer is needed. Total cost saving ranges at most between about 400€ to 200€ per participant per year for a 5% and 100% ADR penetration rate respectively.sponsorship: K. Bruninx and D. Patteeuw gratefully acknowledge the KU Leuven for funding this work in the framework of their PhD within the GOA project on a 'Fundamental study of a greenhouse gas emission free energy system'. E. Delarue is a research fellow of the Research Foundation - Flanders (FWO). The computational resources and services used in this work were provided by the Hercules Foundation and the Flemish Government - Department EWI. (KU Leuven)status: Publishe
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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