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Effects of exposure direction and inclination on the runoff rates of zinc and copper roofs
The effects of exposure direction and inclination on the runoff rates of both zinc and copper has been studied by field exposures on model roofs. Runoff rates for a zinc (Olen, Belgium, industrial site) and copper (Stockholm, Sweden, urban site) model roof have been determined for exposure periods of 1 and 2.4 years, respectively. Runoff rates decrease with higher inclinations from horizon and are higher for exposures directed towards the prevailing wind direction. At a given pollution concentration, the metal runoff is largely governed by the precipitation volume impinging on the surface. As such, runoff rates are higher for low inclinations from horizon and for exposures towards the wind direction. Other parameters including e.g. intensity have a minor effect. The field exposure results were compared to laboratory tests on zinc and copper panels with different inclinations. Current literature mainly describes runoff rates for zinc and copper panels inclined 45 deg facing south. Runoff rates of large size panels of the model roofs and of small size panels were comparable. Calculations of the average runoff rate using the runoff rates obtained on the model roofs as well as market information show that the effect of inclination, orientation and degree of sheltering are important parameters to consider while estimating runoff rates from existing building.
Effects of exposure direction and inclination on the runoff rates of zinc and copper roofs
The effects of exposure direction and inclination on the runoff rates of both zinc and copper has been studied by field exposures on model roofs. Runoff rates for a zinc (Olen, Belgium, industrial site) and copper (Stockholm, Sweden, urban site) model roof have been determined for exposure periods of 1 and 2.4 years, respectively. Runoff rates decrease with higher inclinations from horizon and are higher for exposures directed towards the prevailing wind direction. At a given pollution concentration, the metal runoff is largely governed by the precipitation volume impinging on the surface. As such, runoff rates are higher for low inclinations from horizon and for exposures towards the wind direction. Other parameters including e.g. intensity have a minor effect. The field exposure results were compared to laboratory tests on zinc and copper panels with different inclinations. Current literature mainly describes runoff rates for zinc and copper panels inclined 45 deg facing south. Runoff rates of large size panels of the model roofs and of small size panels were comparable. Calculations of the average runoff rate using the runoff rates obtained on the model roofs as well as market information show that the effect of inclination, orientation and degree of sheltering are important parameters to consider while estimating runoff rates from existing building.
Effects of exposure direction and inclination on the runoff rates of zinc and copper roofs
Einfluss der Ausrichtung und der Neigung von Zink- und Kupferdächern auf deren Ablaufgeschwindigkeit
Wallinder, I.O. (author) / Verbiest, P. (author) / He, W. (author) / Leygraf, C. (author)
Corrosion Science ; 42 ; 1471-1487
2000
17 Seiten, 12 Bilder, 5 Tabellen, 19 Quellen
Article (Journal)
English
Effects of exposure direction and inclination on the runoff rates of zinc and copper roofs
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