1,720,957 research outputs found
Sizing and economic analysis of a trigeneration and CHP system in a commercial site
No full textThe aim of this paper is to provide a method of analysis for a technical and economic study on the installation of a cogeneration or trigeneration system in a commercial site. A case study is developed with particular reference to the economics; a type of micro CHP is considered for this application
DESIGN OF SOLAR CHIMNEY POWER PLANT FOR MEDITERRANEAN COUNTRIES
No full textThe solar chimney, also known as solar updraft tower, is a proposed type of renewable-energy power plant that combines a solar air collector and a central high tube to generate a solar induced convective flow which drives turbines, generating thus electricity. In this paper, it is first described the functional principle of the solar chimney. Some results of the thermodynamic analysis performed are given, including a model for solar collector. The study also considers the performance of a particular reference plant equipped with a floating chimney, with specified climate conditions in Sicily, Italy. A basic economic analysis is finally performed. © 2011 IEEE.The solar chimney, also known as solar updraft
tower, is a proposed type of renewable-energy power plant
that combines a solar air collector and a central high tube to
generate a solar induced convective flow which drives
turbines, generating thus electricity. In this paper, it is first
described the functional principle of the solar chimney.
Some results of the thermodynamic analysis performed are
given, including a model for solar collector. The study also
considers the performance of a particular reference plant
equipped with a floating chimney, with specified climate
conditions in Sicily, Italy. A basic economic analysis is
finally performed
Impact assessment of an energy management system on environmental pollution and economic performance
No full textThis paper proposes a fast and simple algorithm to assess the impact of an energy management system on the environmental and economic performance of a production process. The proposed technique is based on correlations among a set of energy drivers, uses quadratic regression methods and variance analysis. Modeling and parameter extrapolation, factors variability, multi-variable statistics and mean square error are used in order to derive a simple functional relationship between a set of state variables, allowing thus to obtain advanced solutions. Finally, the described mathematical models are implemented in software that is applied to the case study of a food products company. Results indicate the future research directions as well. It is worth notice that the proposed method is not restricted to energy management problems but can also be applied to many other engineering management systems
Technical and economic analysis of a micro-tri/cogeneration system with reference to the primary power source in a shopping center
No full textThe aim of this paper is to provide a method of
analysis for a technical and economic study on the
installation of a cogeneration or trigeneration system in a
commercial site. A case study is developed with particular
reference to the economics a type of micro CHP is be
considered for this application.
Keywords - cogeneration, trigeneration, biomass,
renewable energy, technical and economic analysis,
energy saving
Economic analysis of small-size photovoltaic plants in Italy in the framework of the “Conto Energia”
No full textPhotovoltaic energy is on track to become fully competitive in the electrical system of the European Union (EU) and to become increasingly significant in the global energy mix. Unfortunately, much progress had been mixed in recent years, due to differing national regulations, incentive programs, the availability of money, variable funding opportunities. Like other European countries, also in Italy incentives to photovoltaic energy have evolved through the four versions of the so-called “Conto Energia” (Energy account), that since 2006 has progressively fostered the development of photovoltaic production till the recent boom that took place between 2010 and 2011. In this paper, a comparison is drawn between the payback times on investment in the photovoltaic trade in Italy, given the different incentives that have evolved over the years, the plant components, inflation and producibility in different geographical locations where the plant can be located
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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