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Making solar thermal systems less expensive, often results in a lower system efficiency. However, the cost-benefit ratio is relevant from the perspective of the consumer. The complex impact of component-related and system-related design parameters on the economics of a complete system makes the evaluation and economical optimization difficult.
Therefore, a complete simulation environment has been developed, which can automatically optimize solar-thermal systems,including collector and system parameters. The main collector module consists of a one-dimensional thermal model that was validated with a commercial solar collector. The efficiency curve and the production cost werecalculated as a function of several design and construction parameters. The collector module was linked to the commercial software Polysun®, so that parametric studies can be performed with minimaleffort. Optimization problems can be solved by using the Matlab® optimization toolbox.
The simulation environment wasused for sensitivity studies and optimization problems in order to analyze the impact of collector design-parameters with respect to system cost, system yield andeconomic values. We will demonstrate how a collector can be optimized and how the ideal system parameters like collector number and storage volume can be easily calculated. Finally, we will show how the optimizer is used for a given system in order to find ideal values for the absorber-sheet thickness and the number of pipes. Due to the holistic approach, the application of this tool set can be used for collector development as well as for system planning.
Die Kostenreduzierung solarthermischer Systeme bleibt eine der großen Herausforderungen, um die Solarthermie wirtschaftlich attraktiv zu machen. In der vorliegenden Arbeit wurde eine vollständige Simulationsumgebung geschaffen, mit der bereits in der Entwicklungsphase automatisierte Optimierungen in Bezug auf Ertrag und Wirtschaftlichkeit von Kollektoren und Systemen zur Brauchwassererwärmung und Heizungsunterstützung möglich sind. Die Anwendung dieses Simulationstools ist sowohl für den Komponentenhersteller als auch für den Systemplaner relevant.