Thermal cadastre for Freiburg i. Br. — Areas of suitability for a climate-neutral heat supply

Within the framework of municipal heat planning (xxLinkxx), aptitude areas for a future renewable heat supply have been defined for Freiburg. In this context, suitability does not mean “priority”, but represents a strategic priority in the long-term horizon. The definition of fitness areas is intended, on the one hand, to help building owners and, on the other, operators of electricity, gas and heating networks to decide on renewable heating options or infrastructure investments. The basis for the classification is a future scenario, which assumes that environmental energy and renewable electricity will play a central role in the heating supply in the future. Three types of fitness areas are distinguished: Districts with focus on heating networks, urban districts with focus on environmental energy and renewable electricity as well as mixed areas. The following criteria are used as decision-making criteria for the definition of suitability areas: — Focus heat networks: high heat density in the actual state, predominant settlement typology, district heating strategy, proximity to existing heating networks — Focus environmental heat and heat pumps with renewable electricity: lower thermal densities in the actual state, predominant settlement typology, decentralised supply options. — Mixed areas: some urban districts, which are already supplied in parts via heating networks or are to be developed under the district heating strategy, which also have sub-areas that are not suitable for network development by heat density and settlement typology, are designated as mixed areas. In the areas of suitability with a focus on environmental energy, there is basically the possibility to test the option of local heating islands. This can be a useful option especially if waste or environmental heat sources are available, the use of which is too complex by small individual buildings, such as waste heat from the sewer or from commercial areas. Even when using geothermal energy, it may be useful for neighbouring owners to develop a common strategy to switch heat supply to renewable energies (or have them developed by a supplier or contractor). In the fitness areas with a focus on heating networks, the heat density is usually high and the predominant types of settlements (compressed buildings, block edge construction, high-rise buildings, commercial buildings, etc.) are often less suitable for decentralised renewable heat use. No areas of suitability are designated for biomass, solar thermal and direct use of electricity for heat generation. Solar thermal energy and direct electricity use are expected to be used primarily for drinking water heating in addition to a heating system. Their use can be carried out independently of urban conditions such as settlement structures and thermal densities. The same applies to biomass, which should be primarily used for buildings where environmental heat and heating networks are not an option. This can apply, among other things, to solitaire buildings (clinics, schools, baths, etc.) in areas with low heat density as well as for certain commercial or industrial buildings. The data set documents the state of play of municipal heat planning in 2021. It is based on the master plan Wärme Freiburg developed by GEF Ingenieur AG, the ifeu Institute and the badenova Group on behalf of the City of Freiburg. The municipal heat planning is updated and updated in accordance with the legal regulations. Contact for questions: [email protected]