Monitoring of multi-family houses “Tonpfeifengasse”

Evaluation of activated building parts as heat storage for renewable energy shown on the example of the multi-family houses "Tonpfeifengasse".

Short Description

Starting point / motivation

Power generation from renewable energy sources will contribute to reduced carbon dioxide emissions worldwide. Therefore, power generation from renewable energy will be further developed. Due to the fluctuating character in the supply of renewable energy, load peaks and shortages occur. Because the thermal storage capacity at solid constructions is very high, the combination of a highly qualitative thermal envelope and the thermal storage capacity can be used as energy storage for load peaks together with heat pumps.

Contents and goals

At the residential neighbourhood "Viertelhäuser" the concept of using the mass of a building as energy storage is implemented. Due to a comprehensive monitoring of the heating system and the indoor climate, the functional capability of the thermal mass as energy storage is shown. Additionally, potential problems and uncertainties are pointed out.

The residential neighbourhood "Viertelhäuser" consists of four detached houses. To counteract the strong urban sprawl, the project realizes a concept of high-density housing. The gross floor area of each building is about 500 m². The layout of the four multi-family houses is identical.

For the heat supply of the heating system there is a centralised air/water heat pump on the roof of the house installed. The air/water heat pump supplies the room heating system as well as the domestic hot water heat pump. The air/water heat pump is also used as chiller during cooling period. A decentralised water/water heat pump is used for domestic hot water production. In order to use the mass of the building structure as energy storage for generated power from renewable energy several photovoltaic modules are mounted on the roof of the house.


For a period of two years, the functionality of thermally activated building components as heat storage is analysed by measuring energy flows in all four buildings. A detailed analysis of the indoor room climate as well as an evaluation of the domestic hot water production is conducted in one of the buildings.

Expected results

The project aims to gain new insights in understanding the functionality of thermally activated building components as energy storage for different forms of renewable energies. Potential risks and challenges are identified to improve further development.

Project Partners

Project management

DI DI Dr. Simon Handler, hacon GmbH

Contact Address

hacon GmbH
Thomas-Alva-Edison-Straße 1
A-7000 Eisenstadt