Conference paper describing the design, implementation and feasibility of wastewater heat recovery for the NeckarPark urban redevelopment in Stuttgart. It presents the site and energy concept (22 ha development, ~850 residential units, 220,000 m² net floor area), the wastewater heat potential and technology (sewer-integrated heat exchangers), measured temperatures and a system design that uses heat exchangers, heat pumps and cogeneration to supply a 4-wire low- and high-temperature local heating network. Key performance figures and a rough simulation of annual generation (coverage shares, monthly distribution) are reported.
Questions this document answers
22 hectares
~850 residential units
12 MW and 13 GWh/yr (maximum heat demand and annual demand estimate)
2.1 MW (wastewater heat exchangers installed)
2.6 MW (total thermal output of three heat pumps)