Case Studies2018-04-03T09:23:27+02:00

Case Studies

Read our case studies showcasing the implementation of promising Refurbishment Packages and Business Models

Embedded Technologies

Envelope

HVAC

Renewables

Energy management

Building Characteristics

Building type

Type of ownership

Climate

Age Class

Hem district

Energiesprong is a new refurbishment standard originated in the Netherlands to massify high-performance energy refurbishments, starting with the social housing stock. The principle: long term guaranteed net zero energy and high quality and comfort refurbishment (up to 30 years), with a minimum disruption for tenants thanks to the off-site construction of large components, and an overtinvesment being financed by the money saved on energy bills and maintenance.

Highly insulated walls, roofs with integrated solar panels and other large components are made off-site, which allows whole-house retrofits to be done quickly and with minimum disruption to tenants. Real-life performance for energy use and indoor comfort is guaranteed for up to 30 years.

Within the E=0 project, funded by Interreg North-West Europe, Vilogia, a social housing association, tested the EnergieSprong approach for the first time in France on 10 individual houses in Hem (59) to demonstrate the replicability of the project. These houses are typical northern brick houses with two floors and four rooms built in 1952, with an initial energy performance of E. This first French refurbishment comes with a 25-years performance warranty on the energy performance.

The retrofit was non-intrusive (pre-fabricated facades, new roof with solar panels, new installations e.g. floor and heating plant), esthetic and completed within six weeks, and without the resident needing to move out. Moreover, tenants also enjoy new refurbished kitchen and bathroom, and will have access to a monitoring device and coaching to master their energy consumption. In this case, the total consumption after work is of 74 kWh/m²/y and the renewable energy production of 75 kWh/m²/y, leading to a final energy consumption of -1 KWh/m²/an.

Cost Benefit Indicators

Total Cost

1525 €/m²

Payback period

N/D

Rate of return

N/D

Energy Saving

74 %

Net Present Value

N/D

Graz district

The renovation of the Dieselweg residential area, located in the south of Graz (Austria) was supported by the Austrian system of public housing aid, by additional research funds and by a special support of the governor of environmental affairs of Styria and by the non-profit organization of the GIWOG corporation.

Due to the fact that since the time of construction (1960s) no improvement measures have been carried out, the building stock showed a very energy inefficient and poor situation, with high heating costs and low quality thermal comfort and living.

At this showcase project for the high-performance renovation of a large-volume residential building, the passive house standard was achieved and the heating costs significantly decreased. CO2 emissions were also reduced by the use of renewable energy sources, e.g. solar thermal energy. Prefabricated large-scale façade modules with integrated windows and ventilation systems were used. In this way, an essential increase of the thermal and user comfort was achieved and the indoor environment was improved.

Cost Benefit Indicators

Total Cost

816 €/m²

Payback period

N/D

Rate of return

N/D

Energy Saving

93 %

Net Present Value

N/D

Torrelago district

The renovation of Torrelago district was implemented in the framework of the FP7 funded CITyFiED project (http://www.cityfied.eu/) .

Torrelago district involves 31 private multi-property residential buildings (1488 dwellings) that were constructed in the 1970s–1980s, more than 140,000 m2 and 4000residents involved. Former conditions of the district were very low in terms of efficiency, comfort and costs, which fostered the intervention. Main energy measures implemented at the building scale are buildings external insulation (Composite System-ETICS, ventilated façade), connection to district heating (twelve new heat exchange substations at building level), individual metering to raise users’ awareness.

Cost Benefit Indicators

Total Cost

118 €/m²

Payback period

N/D

Rate of return

N/D

Energy Saving

35.58 %

Net Present Value

N/D