Evaluation and simulation of a combined system based on heat pump, solar collectors and borehole storage

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The combination of solar collectors with heat pumps and any kind of ground storage offers further possibilities to reduce the electricity demand in buildings significantly compared to standard heat pump systems. On one hand the solar collector enables to deliver higher temperatures to the evaporator of the heat pump and to generate the ground storage much faster, on the other handthe solar heat can be used directly although this requires more advanced system designs and control strategies. In this thesis work the system combination mentioned above has been analysed in two different ways. First, measured data from a system placed in the garden at SERC have been evaluated and second, system simulation with the program TRNSYS have been carried out analysing different designs and configurations for single components in the system. For the evaluation of the measured data files were created that enable to run the whole procedure automatically and to create diagrams for the most important values at the same time. The analysis of the test system at SERC showed that the coefficients of performance of the heat pump for different source and load temperatures do not correspond with the curves from the heat pump company. The simulation work was concentrated mainly on the analysis of the borehole model, further calculations included different system designs for the combination of different solar collectors with a heat pump and borehole storage. In both parts the influence of different parameters on the system performance was analysed regarding as well as energetic values as the temperatures in the ground storage. The advantage of this system c...