Heating Replacement for a Family Home – A Simple Route to a Heat Pump
In a typical family-home neighbourhood in Dübendorf, we replace existing oil and gas heating systems with properly sized air-to-water heat pumps and coordinate the entire project.
Eight Heat Pumps on One Shared Borehole Field
Gärtnerstrasse, Bühlwiesenstrasse in Dübendorf
2010
Project Description
From one central oil boiler to four plant rooms
The four semi-detached apartment buildings were originally supplied by one large oil boiler in a central plant room. As the system reached the end of its service life, the heat generation was renewed. Instead of simply replacing the central boiler, the heat supply was divided between four decentralised plant rooms. Each plant room was equipped with two 50 kW Alpha innoTec brine/water heat pumps.
Project Description
27 boreholes as one shared heat source
A shared geothermal field with 27 boreholes, each 250 metres deep, was installed beneath the courtyard and underground car park. A common source-water ring allows all eight heat pumps to draw from all 27 boreholes. The field provides a total of 6,750 metres of borehole depth and is designed for 290 kW of heat extraction from the ground. Three plant rooms received new indirect hot-water cylinders. In the former central plant room, the existing external domestic hot-water charging system was retained.
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A Private District Heating Network for Freudwil
Two Fröling wood-chip boilers with outputs of 150 and 60 kW supply houses and apartment buildings in Freudwil through a private district heating network. We installed the central plant, substations and complete connections for the individual heat consumers.
