© industrieblick / Fotolia
The decarbonisation of heat supply as a central element for achieving climate protection targets presents the district heating industry with major challenges. In addition to optimising the network structures, a large proportion of the heating network systems require the replacement of the still dominant fossil heat generation by less CO2-intensive heat sources. One option for the short- to medium-term transformation of heat supply in this context is the use of waste heat from industrial production processes.
During the project “EnEff:Wärme: Netzgebundene Nutzung industrieller Abwärme (NENIA)” ifeu, together with its partners GEF Ingenieur AG, indevo GmbH and geomer GmbH, carried out a nationwide, spatially high-resolution comparison of available waste heat flows at manufacturing sites with existing and potential additional heat network supply areas. The results show, that 9.3 TWh/a or 11 TWh (incl. high temperature range) can be used in the district heating stock at current operating temperatures (conservative scenario). This potential can also be exploited economically at almost all locations, partly due to the short distances between waste heat sources and heat sinks, and can thus make an important contribution to the decarbonisation of district heating generation. In addition, technically at least 10.6 TWh/a of industrial waste heat could be used in newly constructed heating networks, which would allow additional greenhouse gas savings of around 2.3 million t/a CO2-e to be achieved.