Buried Twin Pipe Model Validation for System Simulations of Ice Storage Tanks in 5GDHC networks
Abstract
As cooling becomes more and more important for the building sector in central Europe, low temperature 5th Generation District Heating and Cooling (5GDHC) networks are of increasing importance. Different heat sources for such networks exhibit different limitations. While waste heat is limited through its origin, the capacity of ground and lake water is limited by their temperature levels in winter, while abundant heat is available in summer times. Therefore, the integration of seasonal thermal storages can be of great benefit. One option is the implementation of ice storages as long-term load shifting elements. Moreover, peak demands during both heating and cooling periods demand for oversizing the heat/cold supply. Here ice storages can play a different role by providing additional short-term capacity for heating and cooling on the coldest and hottest days respectively. In this paper, we present 5GDHC network configurations in which ice storages can be operated in a useful manner. Furthermore, we analyze the temperature levels and differences in a 5GDHC network over a year as a basis for tuning the parameters of a buried double pipe model typically employed in such networks.