Building Just Finished
Summary
The new retirement home in the south western edge of Stuttgart was built in a location were only electricity could be used for heating. Thus the initial energy concept which proposed a standard electrical heating system was altered to a ground coupled heat pump with a 161 m² solar thermal system to supply the energy for hot water in summer. In addition the building envelope was improved compared to national standards. The solar system was funded by the Deutsche Bundesstiftung Umwelt and the heating system was funded by the state of Baden-Württemberg. The additional costs for the building envelope were paid for by the city of Stuttgart.
Results
After some work, the system is now running in a satisfying manner. The solar system operates very well, but the heat pump systems performance is a little bit worse than expected because of the reasons mentioned above.
The heat pump produces approximately 500.000 kWh of heat per year and consumes 165.000 kWh of electricity. This gives the system an efficiency of 3.0 which is acceptable with the boundary conditions mentioned.
The costs of solar collectors were 46.100 € and the costs for piping and controlling the solar system were 24.000 €. The heat pump caused an investment of 68.500 € which includes the installation and control system. The cost for drilling the ducts was 149.000 € (or 53 € per m of duct). All these costs are excluding VAT. The solar collectors produces between 55.000 and 60.000 kWh/a, a gain of 340 kWh/m² per year. This is an average value for the local conditions.
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Case Study (1276 Kb PDF)