Estimation of the corrosion risk of solar collectors : A five year weathering experiment in industrial and rural areas
The weathering experiment consisted of five solar collector models from different manufacturers, chosen for their various construction materials, arranged in two identically equipped test fields, at one site with an industrial and one with a rural environment. The environmental variables which are significant for thermal charge of the collectors (such as solar irradiance) and for the corrosion risk (such as relative air humidity and gaseous sulphur dioxide concentrations) were recorded over two and half years. Air suspended particulate matter extracted by dust filters during that time from the sample air stream was also analysed and the mean concentrations of particulate bound sulphur estimated. The average values of the concentration of gaseous sulphur dioxide at the industrial site were higher than those of the rural site by a factor of about 1.7. The same ratio between those two sites was also found for the average values of the concentration of sulphur bound to air suspended particulate matter. Greater corrosion effects were observed on the industrial site, but they were not severe enough to predict serious damage on prolonged exposure. Comparing the corrosion effects with those obtained from the usual "moist SO(2) tests" confirmed that the latter are much too aggressive for predictions of resistance against atmospheric corrosion, with the exception of collector installations in some rather rare situations of great corrosion risk.
Bibliographic Reference: EUR 13907 EN (1992) 64 pp., MF, ECU 10.50
Record Number: 199210341 / Last updated on: 1994-12-02
Original language: en
Available languages: en