The Influence Of Solar Radiation On
The Distribution Of Temperatures In
Historic Masonry
Author(s)
P. Beran
Abstract
One of the degradation processes in historic masonry is caused by cyclic thermal
stress. Thus this paper is focused on the definition of the loading of historical
objects. The component of this research was to detect the relations of wall
maximal surface temperatures to its orientation to the cardinal points, material
characteristics and speed of the wind around the surface. These relations were
obtained by means of the 1-D numerical model of the wall. One surface of the
wall was exposed to solar radiation and outside air, the other surface was
exposed only to outside air. The simulations of the temperature response of the
wall on climatic actions during July 2006 were used to define maximal surface
temperatures. The maximal surface temperature of the wall significantly depends
on its orientation to the cardinal points, declination of the surface from vertical,
the speed of wind around the surface, coefficient of absorption of solar radiation,
heat conduction of the wall and volume heat capacity. These results help to
detect the facades of historic objects and historic materials which are highly
stressed by temperature actions. The amount of money for renovation is limited,
so this information could be used during planning of the renovation of the
historical building. For example, if the failures on historic facades are caused by
temperature stresses, the reduction of solar absorption coefficient by cleaning the
dirty surfaces could be used only on the extremely loaded facades. Also the
accurate selection of the repair material with respect to thermal expansion
compatibility can reduce thermal stress.
Keywords: temperature, solar radiation, material properties, numerical model,
material compatibility, cultural heritage.
Keywords
temperature, solar radiation, material properties, numerical model,
material compatibility, cultural heritage.
Related Book
Other papers in this volume
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