By employing shallow geothermal systems, heat is extracted from the subsurface and utilized for
space heating and domestic hot water (DHW). In built-up areas the available thermal energy is even
larger, if the subsurface urban heat island (UHI) effect is also considered. Increased surface
temperatures combined with underground anthropogenic heat sources, such as basements and
sewage systems, can raise urban groundwater temperatures by 3 K to 7 K above those in rural areas.
Previous studies calculated the annual average anthropogenic heat flux into the ground by means of
a spatially resolved heat transport model (Benz et al., 2015).
In this study, the geothermal potential is compared to the energy demand for space heating as well
as DHW for the urban quarter “Rintheimer Feld” in Karlsruhe, Germany. In this quarter the housing
association (Volkswohnung GmbH) is proprietor of 30 multifamily-houses with about 70,000 m² of
living space. These houses were built in the 1950/60s and meanwhile have been refurbished (Rink
and Kuklinski, 2015). The calculation is based on the consumption data of space heating and DHW of
all buildings before and after the refurbishment. ... mehr