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Le caldaie a condensazione - Confronto tra metodi di calcolo delle perdite di generazione
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Stima del risparmio energetico ottenibile in impianti a radiatori abbinati a caldaie a condenzazione
No full textEfficiency and Energy Savings Evaluation for Dry-Cooler Equipped Plants
No full textThe problem of the high energy requirements for the building climatization is well known. Some significant energy savings may be achieved by means of indirect free cooling. The aim of this work is to analyze the possibility to exploit this systems to cool down water of fan coil plants, in some kind of buildings taking into account different climate conditions and internal gains. The water supplying the plant terminals is cooled in the Dry-Cooler or in the chiller: an external air-water heat exchanger. The external climate conditions can guarantee a free cooling effect in order to reduce the load absorbed by the chiller. First of all, the thermal loads of two kind of buildings (a shopping centre and an office block) have been evaluated through the simulation of their behaviour during a whole year, with a hourly time-step, for different climate conditions, using the software Energy Plus. Realistic working conditions, suggested by Dry Coolers manufacturers, have been imposed. For each hour during the simulation period, it has been determined the external maximum temperature that lets the Dry Cooler balance the cooling load while the chiller is off. Then it has been possible to verify the sharing out of the thermal load between Dry Cooler and Chiller
Cooling energy savings with dry cooler equipped plants in office buildings
No full textThe cooling energy requirements are a key issue for office buildings in warm climates, but they have become considerable also in temperate climates, ‘cause the growing level of buildings thermal insulation.
This aspect is more critical in office blocks than in residential buildings, due to the higher value of thermal energy supplied by internal loads. Office buildings are usually equipped with cooling systems in order to guarantee thermal comfort conditions for the office workers.
The aim of this work is the evaluation of energy saving reachable in office blocks cooling requirements, using a water indirect free cooling operating procedure for the plant.
It is assumed that the HVAC plant is equipped with dry-coolers that work as coolers of the refrigeration equipment condensers or just as coolers of the water to be supplied to fan coils.
As the more solar radiation there is, the more cooling power is needed, dry-coolers, equipped with on-board photovoltaic panels, have been considered.
The cooling loads of the office block have been evaluated through Energy Plus hourly time-step simulations for different climate conditions. Finally, electrical consumption of dry-c and energy produced by PV panels in different climates and with different tilts have been evaluated and compared
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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