1,721,030 research outputs found
Economic and energetic aspects to consider in window renovation alternatives. A case study in a cold climate
Full text linkWhen thinking of renovating the windows of old buildings, the building owner has a lot of
decisions to make. These are to keep the window but make it more energy efficient by adding
an extra pane or to completely change the whole window. At the same time, the joint between
the window frame and wall makes a thermal bridge which depends on how much insulation
has been placed in the cavities after installation. Upon the decision of keeping the window,
the status of this joint will be unchanged. This thesis deals with finding out the best economical
solution for a company that has rental apartments in Gävle in Sweden, Gavlegårdarna AB. To
calculate the thermal bridges, which are weak areas of the building envelope in which they
significantly increase the energy load of houses, a CDF program called Fluent is used to
quantify the heat loss at the joints. Measurements have been performed to validate the CFD
model. To simulate the energy savings in the building, the building energy simulation program
IDA-ICE is used. Finally, Life Cycle Costing calculations are made to assess the best long term
economical option. It is concluded that the most reasonable solution is to add an extra glass
in the existing window, but it is not the most ecofriendly. A more ecological solution is to add
the extra glass and to perform enhanced insulation at the joints around the window frames
and walls, or to replace the old window with a new low energy window – however, these are
not profitable solutions
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
ECONOMIC AND ENERGETIC ASPECTS TO CONSIDER IN WINDOW RENOVATION ALTERNATIVES : A case study in a cold climate
No full textWhen thinking of renovating the windows of old buildings, the building owner has a lot of decisions to make. These are to keep the window but make it more energy efficient by adding an extra pane or to completely change the whole window. At the same time, the joint between the window frame and wall makes a thermal bridge which depends on how much insulation has been placed in the cavities after installation. Upon the decision of keeping the window, the status of this joint will be unchanged. This thesis deals with finding out the best economical solution for a company that has rental apartments in Gävle in Sweden, Gavlegårdarna AB. To calculate the thermal bridges, which are weak areas of the building envelope in which they significantly increase the energy load of houses, a CDF program called Fluent is used to quantify the heat loss at the joints. Measurements have been performed to validate the CFD model. To simulate the energy savings in the building, the building energy simulation program IDA-ICE is used. Finally, Life Cycle Costing calculations are made to assess the best long term economical option. It is concluded that the most reasonable solution is to add an extra glass in the existing window, but it is not the most ecofriendly. A more ecological solution is to add the extra glass and to perform enhanced insulation at the joints around the window frames and walls, or to replace the old window with a new low energy window – however, these are not profitable s
Economic and energetic aspects to consider in window renovation alternatives. A case study in a cold climate
No full textWhen thinking of renovating the windows of old buildings, the building owner has a lot of
decisions to make. These are to keep the window but make it more energy efficient by adding
an extra pane or to completely change the whole window. At the same time, the joint between
the window frame and wall makes a thermal bridge which depends on how much insulation
has been placed in the cavities after installation. Upon the decision of keeping the window,
the status of this joint will be unchanged. This thesis deals with finding out the best economical
solution for a company that has rental apartments in Gävle in Sweden, Gavlegårdarna AB. To
calculate the thermal bridges, which are weak areas of the building envelope in which they
significantly increase the energy load of houses, a CDF program called Fluent is used to
quantify the heat loss at the joints. Measurements have been performed to validate the CFD
model. To simulate the energy savings in the building, the building energy simulation program
IDA-ICE is used. Finally, Life Cycle Costing calculations are made to assess the best long term
economical option. It is concluded that the most reasonable solution is to add an extra glass
in the existing window, but it is not the most ecofriendly. A more ecological solution is to add
the extra glass and to perform enhanced insulation at the joints around the window frames
and walls, or to replace the old window with a new low energy window – however, these are
not profitable solutions
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
Evaluation of heat losses from a domestic hot water circulation system
No full textHeat losses are an important problem in domestic hot water circulation systems. Therefore, to reduce these losses becomes an issue of utmost importance both economically and environmentally. Nevertheless, it has not been until recent years when these losses have been studied further. Commonly studies have focused on the heat space system operation or radiator system. This study focuses on heat losses in the domestic hot water circulation through the piping system in a building at a school located in Gävle (Sweden) using non-destructive flow and temperature reading devices. The heat used by the school is provided by the district heating network that feeds several heat exchangers. The heat losses, at the same time, will be compared with simulation and theoretical procedures to corroborate them. The domestic hot water piping system of this study consists on more than 1200 meters of insulated copper pipes with different diameters and different insulation thickness. The system was measured for one week (April 26, 2015 to May 3, 2015) when there are working days and nonworking days. A 5% of the annual district heating consumption in the school was calculated as heat losses in the domestic hot water circulation system in the building studied. Finally, improvements in insulation system and changes in the domestic hot water temperature have been simulated and they demonstrate that savings of up to 35% of the heat losses can be achieved and produce significant energy savings
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