Integration of solar thermal systems into existing district heating systems

The work was carried out based on real data of an example DH network in Germany. It was analyzed how a sub-network of a system can be supplied during the summer season by a solar thermal system as far as possible independently from the main-network without using a back-up boiler system. The favored solution in this article is to use a thermal storage that can be recharged once a day by a central CHP plant.