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Comparison of two model systems for the calculation of the solar irradiance on shaded, arbitrarily orientated surfaces

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In its guideline 3789, part 2, the VDI (Verein Deutscher Ingenieure – German Association of Engineers) presents methods that allow the calculation of hourly values of the global irradiance on arbitrarily orientated surfaces. In the present study, these approaches are compared to an alternative combination of previously published models for different partial stages of the simulation that have been implemented in a program called METSUN. It is shown that measurements of the global radiation and of its components can be better reproduced with METSUN than with the approaches of the VDI guideline. Furthermore, the alternative model combination is more flexibly usable. The VDI guideline imperatively requires observations of the degree of cloud cover. With METSUN, however, also sources of information that provide values of the global irradiance on an unshaded horizontal plane can be used as starting point of the calculations, for example measurements of the global radiation at a nearby meteorological station. It is shown that this can increase the reliability of the results.

In der VDI-Richtlinie 3789, Blatt 2, werden Verfahren zur Berechnung stündlicher Werte der Globalstrahlung auf beliebig orientierte Oberflächen vorgestellt. In der vorliegenden Studie werden diese Ansätze mit einer alternativen Kombination existierender Modelle für Teilschritte der Simulation verglichen, die in einem Programm namens METSUN implementiert wurden. Es wird gezeigt, dass sich Messwerte der Globalstrahlung und ihrer Komponenten mit METSUN besser reproduzieren lassen als mit den Ansätzen der VDI-Richtlinie. Die alternative Modellkombination ist auBerdem flexibler verwendbar. Die VDI-Richtlinie setzt zwingend das Vorliegen von Beobachtungswerten des Bedeckungsgrades voraus. Mit METSUN dagegen Können auch Informationsquellen genutzt werden, die Werte für die Globalstrahlung auf eine unbeschattete horizontale Fläche liefern, beispielsweise Messungen der Globalstrahlung an einer nahe gelegenen meteorologischen Station. Es wird gezeigt, dass sich die Genauigkeit der Simulationsergebnisse dadurch erhöhen kann.

Document Type: Research Article


Publication date: 2004-10-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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