Huge
heat losses appear in the EU energy balance. From the annual energy
supply of 63 EJ , more than 20 EJ heat are lost in power plants,
oil refineries, and industrial processes.
Parts
of these losses can be retrieved and distributed by district heating
systems to heat urban buildings.
District heating
systems provide the necessary heat load for high-efficiency CHP
plants and, at the same time, make it also possible to use renewable
energy (RES).