demand single-family house ( U
wall = 2.46 W/m −2 ·°C; U
roof = 1.75 W/m −2 ·°C) is expected to rise by 56 – 112% in 2050 and 112 – 185% in 2080. In the coldest city, the annual heating energy demand is expected to decrease
Red-thermoluminescence (RTL) dating was applied to quartz grains from a flat roof-tile of “Shin-Yakushiji” temple, Nara, built
in Japan, probably 1258 years ago. Based on overlapping patterns with other roof-tiles, one flat roof-tile was separated into
several zones. The equivalent doses were accurately evaluated to be 4.4–5.1 Gy for each zone. The evaluation of annual doses
has been done under the consideration of overlapped numbers of roof-tiles and soil layers under the roof-tiles. Evaluated
RTL ages were in good agreement with the construction date of the temple. The present evaluated age was the youngest one within
several ages we previously have been deduced from the RTL dating.
Authors:Pavel Soudek, Lubor Kalousek, and Antonín Žák
This paper is focused on hygrothermal assessment of the eave overhang detail in above-rafter placed thermal insulation roof system. Results of the long-term measurement of this detail performed on a real building as well as the testing of the measuring method are presented in this paper. Within this measurement the moisture of wooden elements performing an eave overhang of the roof was monitored primarily in order to verify their long-term functionality. In addition the temperature and relative humidity in the roof structure were measured as well. As part of this measurement, various design variants of above mentioned detail in combination with different compositions of the roof structure were compared. The long-term functionality of the assessed details is evaluated in the conclusion of this paper, taking into account especially hygrothermal status of wooden element, which is associated with threats of infestation of these elements by wood decaying fungi or insects.
The first aim of our research is to calculate the solar irradiance on roofs assuming clear sky and real (climatologically typical) conditions, respectively, and compare them in a densely built inner city study area in Szeged (Hungary). The second aim is to analyse the shading effect of the tree-crowns on the possible solar energy gain of building roofs. The calculation of the climatologically potential solar energy gain based on an empirical atmospheric transmittance (calculated from the measured global radiation values). The results show that in the case of clear sky condition the urban vegetation (tree-crowns) causes significant potential solar energy loss on the roofs, but in the real situations this effect is less significant. These obtained results clearly illustrate how useful tool could be the presented calculation method at the economical and technical planning stage of the installation of solar systems on roofs.
Building materials (finished products), as well as space-forming and load-bearing building structures, in particular foundations, walls and pillars, ceilings and roof structures, have been
Authors:Milan Zlatanović, Milica Cvetković, and Nikola Velimirović
of space roof construction , Annuaire de l’Universite d’Architecture, de Genie Civil et de Geodesie-Sofia, 2000–2001, pp.43–52.
Velimirović Lj., Radivojević G., Kostić D.: Analysis of Hyperbolic Paraboloids at