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Effect of modelling solar radiation on the cooling performance of radiant floors
No full textWhen modelling buildings, solar radiation has a large impact on the thermal balance because it usually heats the rooms. In radiant
systems that are used for heating and cooling buildings, solar radiation has a large influence both on indoor temperatures and on the
efficiency of the radiant system.
Many analyses have already been carried out in order to study how beam and diffuse radiation can be distributed in a room. One of
the most difficult issues, when modelling room thermal balance, is how to simulate the solar radiation when it enters the room, which in
turn depends on the reflectance characteristics of the surface finishing elements.
In this study, four different radiation models have been applied in order to solve an overall detailed, dynamic thermal balance in a
room with pipes embedded in the floor. Two of the models are detailed; the other two consider the radiation entering the room to be
diffuse radiation. As for the behaviour of the impinging solar radiation on the covering materials in a room, measurements have been
carried out to determine the reflectance coefficients, which will be used in simulations for characteristic materials used in buildings.
Results of the simulations show that a simplified model, which considers solar radiation as uniformly distributed in a room, cannot be
used for a detailed comfort analysis; however, when looking at the cooling output of a radiant floor system at the design stage, a simplified
model can predict energy transfer to a certain level of accuracy. Moreover, results coming from combined measurements and simulations
show that the reflectance characteristic of the covering materials does not affect the cooling capacity of the radiant floor systems,
since the most important parameter for cooling performance is the thermal conductivity of the covering layer
Modellizzazione di ambienti climatizzati con sistemi radianti accoppiati a facciate a doppia pelle
No full textPadova - S. Martino di Castrozza (Italia
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
A pilot project for a low energy building equipped with thermal slabs, heat pump and ground heat storage
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