{"id":810,"date":"2021-05-24T17:30:06","date_gmt":"2021-05-24T17:30:06","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=810"},"modified":"2025-09-12T15:01:35","modified_gmt":"2025-09-12T15:01:35","slug":"810-2","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/810-2\/","title":{"rendered":"Smart Quarter Karlsruhe-Durlach, Ersinger Stra\u00dfe 2"},"content":{"rendered":"
The building forms part of a cluster of five large renovated multi-family buildings from the 1960s within the Karlsruhe\u00a0district Durlach, where an integrated energy system is demonstrated within the research project \u201cSmart district Durlach\u201d. The demonstrated heat pump technology features finned PVT collectors as single source for the heat pump system. Ultrafiltration are units are integrated in the drinking water circuit to allow low temperatures and maintain the hygienic requirements. 13 out of 150 radiators were exchanged to allow a heating temperature reduction to 55\/45 \u00b0C.<\/p>\n

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The building was originally built in 1963 and renovated in 1995. The building features a heated floor area of 2112 m\u00b2 on 5 floors with a total of 30 apartments. The building was renovated exchanging the windows with insulating glazing (Uwin = 1.7 W\/m\u00b2K), and adding layers of thermal insulation (styrofoam, d = 60 mm, l = 0.035 W\/mK) to the fa\u00e7ade, cellar and to ceiling, thus reducing the overall U-value of the opaque envelope from Uenvelope = 1.71 W\/m\u00b2K to\u00a0 0.323 W\/m\u00b2K.<\/p>\n

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Key facts<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Building <\/strong><\/td>\n<\/td>\nHeat pump and source<\/strong><\/td>\n<\/tr>\n
Location<\/td>\nKarlsruhe, Germany
\n<\/em><\/td>\n		<\/td>\nNumber of HP<\/td>\n1<\/em><\/td>\n<\/tr>\n
Construction<\/td>\n1965<\/em><\/td>\n<\/td>\nInstalled power<\/td>\n55.4 kW<\/td>\n<\/tr>\n
Heat distribution<\/td>\nradiator heating<\/em><\/td>\n<\/td>\nOperation mode<\/td>\nbivalent<\/em><\/td>\n<\/tr>\n
Heated area<\/td>\n2112 m\u00b2 living<\/td>\n<\/td>\nHeat source<\/td>\n\u00a0PVT collectors
\n(solar+ambient)<\/em><\/td>\n<\/tr>\n
Level of insulation<\/td>\ngood
\n(renovation in 1995)\u00a0<\/em><\/td>\n		<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Heating system<\/strong><\/td>\n<\/td>\nDomestic hot water <\/strong><\/td>\n<\/tr>\n
Heat demand<\/td>\n60 kW<\/td>\n<\/td>\nType of system<\/td>\ncentral<\/td>\n<\/tr>\n
Heating temperature<\/td>\n55 \/ 45 \u00b0C
\n<\/em><\/td>\n		<\/td>\nMax. temperature<\/td>\n55 \u00b0C (with UF)
\n62 \u00b0C (without UF)<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\nCirculation system<\/td>\nyes<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Description of the technical concept<\/strong><\/p>\n

Heat Pump Technology<\/strong><\/em><\/p>\n