15.07.2015   EuroSun2008-11

Description of the investigated systems

The sensitivity analysis methods briefly described above are applied to analysis of two solar heating systems.

Fig. 1 shows the design of the system installed at a hospital in Frankfurt (Germany) [3]. It is designed as a preheating system. Depending on the temperatures in the collector loop and in the solar buffer storages, different inlets are used for charging the solar storage. For this system the design parameters are fixed at the values given in the figure, and only the influence of the operational parameters is investigated. The time resolution for simulating the system in TRNSYS was set to 10 minutes.

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In Fig. 2, a schematic layout is shown of the reference solar combisystem of Task 32. Besides the collector and storage tank, it has also an auxiliary heating loop with heated volume inside the tank. The weather data for Zurich (Switzerland) were taken for simulation and the time resolution was 3 minutes. The influence of a few design and operation parameters is investigated by the FAST algorithm.

This system is an example of planning case, when all design and operational parameters can be chosen for sensitive analysis and consequent optimization. The methodological approach would be first to apply the Morris method and then FAST for more accurate estimation of the parameters influence.