Sustainable residential construction with PVT technology in Hamelin
In a new construction project, Grübbel Generalunternehmer GmbH is realising a pioneering residential complex with 18 residential units. The integration of PRISMA® PVT HORIZON 4.0 modules in combination with a surface collector and a brine/water heat pump creates a highly efficient, regenerative energy system.
ISFH-Hameln will monitor the project for one year as part of the Integrate-XL project. All key measurement parameters are recorded and analysed later.
Project type: 2 apartment blocks „Schwarzer Weg 62“, Hamelin (2×18 units)
Location: Hamelin
Customer: Grübbel GmbH
PVT technology: 48 × PRISMA® PVT HORIZON 4.0 from TWL-Technologie GmbH
Heat pump: Brine/water heat pump
Surface collector: 385 m² with 15 kW extraction capacity
Special feature: Reduction of the area collector and tree preservation thanks to PVT support/ regeneration
Monitoring: Research support as part of the Integrate-XL project
Project idea and context
The residential complex sets new standards for sustainable construction. As general contractor, Grübbel Generalunternehmer GmbH planned and realised the project in serial timber construction with prefabricated elements. The aim was not only to realise an Efficiency House 40 EE in accordance with GEG 2023, but also to build an overall energy system that goes far beyond conventional solutions. ISFH Hameln was commissioned to develop the entire heating system. Grübbel's objective was to achieve a system annual performance factor of 3.5. Both the PVT system and the surface collector were designed accordingly.
Energy system and componentn
The thermal energy supply is based on a combination of regenerative sources. 48 PRISMA® PVT HORIZON 4.0 modules supply thermal energy to regenerate the ground and are also directly integrated on the source side via a hydraulic separator. The electricity generated is also available to the heat pump. A surface collector with an area of 385 m² is also installed. Thanks to the support of the PVT system, the area of the surface collector could be reduced by 25 %, which not only saved earthworks and therefore costs, but also made it possible to preserve two old trees. The heat sources are utilised bivalently by a brine/water heat pump.
Hydraulics and system integration
A 100-litre cold storage tank (filled with brine) is installed upstream of the heat pump as a hydraulic separator to decouple the different volume flows from the ground source and PVT. The home stations are connected to the heating system via a 4-pipe system (heating and domestic hot water including circulation). This minimises energy loss, as the underfloor heating supply at a low temperature level and the hot water supply at a higher temperature level are supplied to the flat via separate lines.
