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The solar aperture is one of the thermal steady state parameters of interest for the determination of energy distribution in buildings. It is well known from theoretical analysis that the solar aperture is influenced by the season and the geophysical position of the building components. However, experimental work in this direction is mainly performed on windows and indoor test procedures. This paper discusses the results obtained for the solar aperture of a building component measured under real weather conditions. A lightweight testcell equipped with a concrete wall plus window has been measured for almost two years at the Ispra testsite. A theoretical analysis of the solar aperture for an opaque wall and a window is performed. An attempt is made to calculate the varying value of the solar aperture, using real climatic data from several experiments repeated during the different seasons, for every month of the year. Several identification techniques have been applied for the assessment of the thermal parameters. Finally, recommendations are given for future work in this direction.

Additional information

Authors: BLOEM J J, JRC Ispra (IT);OSCULATI F, JRC Ispra (IT);RIKKERS E, University of Twente (NL)
Bibliographic Reference: Paper presented: Parameter Identification Methods and Physical Reality, Ispra (IT), Oct. 26-28, 1992
Availability: Available from (1) as Paper EN 37266 ORA
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