Comparison of Solar District Heating Concepts at Various Land Prices
Abstract
Two solar district heating concepts for an exemplary new housing development at different supply temperature levels were examined in terms of economic and energy efficiency aspects. Both district heating-based heat supply systems were designed to meet a renewable heat share of 80 %. Afterwards, the systems were compared within a detailed economic analysis. Key issue is, under which boundary conditions a central solar district heating system is more beneficial than a district heating system with distributed solar thermal systems for very low demand density areas in Germany. Thereby, the impact of land prices due to land use for ground-mounted solar collectors and seasonal storages on the system feasibility was evaluated.