Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Heat supply by shallow geothermal energy in Karlsruhe
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. By merging the anthropogenic heat flux and the energy stored underground we obtain the geothermal potential. Based on these results and considering space availability as well as (hydro)geological boundary conditions, we determine the required number of open and closed geothermal systems. Furthermore, we determine how much of the energy demand – before and after refurbishment, respectively – can be covered by one of the three following geothermal systems: (1) horizontal ground heat exchangers (HBHE), (2) ground source heat pump (GSHP) systems with vertical borehole heat exchangers (BHE) and (3) ground water heat pump (GWHP) systems. Our results show that energy supplied by the HBHE is not sufficient, since the area required for the system installation is too small. Totally 90% of the heating energy demand can be covered. Assuming a BHE length of 100 m and a ...
Heat supply by shallow geothermal energy in Karlsruhe
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. By merging the anthropogenic heat flux and the energy stored underground we obtain the geothermal potential. Based on these results and considering space availability as well as (hydro)geological boundary conditions, we determine the required number of open and closed geothermal systems. Furthermore, we determine how much of the energy demand – before and after refurbishment, respectively – can be covered by one of the three following geothermal systems: (1) horizontal ground heat exchangers (HBHE), (2) ground source heat pump (GSHP) systems with vertical borehole heat exchangers (BHE) and (3) ground water heat pump (GWHP) systems. Our results show that energy supplied by the HBHE is not sufficient, since the area required for the system installation is too small. Totally 90% of the heating energy demand can be covered. Assuming a BHE length of 100 m and a ...
Heat supply by shallow geothermal energy in Karlsruhe
Tissen, Carolin (Autor:in) / Menberg, Kathrin (Autor:in) / Bayer, Peter (Autor:in) / Blum, Philipp (Autor:in)
15.10.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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