Case Study: nZEC - New construction of 104 dwellings in Engelbert Weiß Weg, Salzburg, Austria (UNDER MONITORING)

Name of organisation: GSWB - Gemeinnützige Salzburger Wohnbaugesellschaft m.b.H.

Stage of development: completed

Year of finalization: 2009

Type of project: construction

Area: urban

Scale: individual buildings

Type of building: Apartment in a block of six to ten stories

Number of units/dwellings: 104

Tenure: social rental

Street: Engelbert Weiß Weg, 1

Postcode: 5020

City: Salzburg

Region/ County:

Country: Austria

Last Update: 15.04.2015

Funding Certification Monitoring Work with Residents Thermal Insulation Heating and Hot Water Ventilation Solar Thermal

Short Description

The project is a “very low” energy building, built on a standard above the required one for new buildings providing an automatic ventilation with heat recovery and a solar plant.

The building is located close to the train station close to the city centre; this location required special construction of the foundation to avoid disturbance by trains (vibrations, noise).

There is also an information system for residents on energy consumption and provision of energy saving measures.

The housing project is part of an urban renewal project which combines housing, hotels, office buildings plus shopping centre in a former idle area.


Key Elements

Certification

Calculated heating demand for space heating: 18 kWH/m2(gross).


Work with Residents

Via permanent monitoring of energy consumption/solar gains and information of residents it is possible to identify situations of sub-optimal energy consumption and to provide advice for energy saving measures.

Actual energy consumption is displayed on an interface which can be checked on public monitors in the buildings as well as on individual TV sets. If energy consumption is suboptimal a lightning system informs residents; energy saving measures are provided as well.


Funding

Mix of own funds and public soft loans. 

Costs

Total

Per m2

Construction overall

€ 13.036.000

€ 1.775

VAT

Not included since VAT of construction costs is deductible according to Austrian VAT regime (Vat charged on rents)

Space heating + hot water

€ 38.603

Ventilation

No extra meters

Operation, inspection and service

€ 9.916

 



Thermal Insulation

Insulation of façade by thermal insulation compound system with EPS close to passive standard.


Ventilation

Central automatic system with heat recovery.


Heating and Hot Water

District heating.


Solar Thermal

260m2 solar panels. Solar gains/year: 124.757 kWh.


Monitoring

Click here to access the monitoring data on the HIVE Database!


Main Results

Like in other very low energy buildings the energy consumption is low  but higher than calculated. Solar energy covers a sufficient share of energy consumption (20% of total heating + hot water).

As regards other important aspects of the projects it is notable that the special construction of the foundation (flexible to prevent vibrations from train traffic) shows efficient results; there are no complaints from residents.


Lessons learned

The extra energy efficiency components create extra costs which are partially covered by a public soft loan to keep rents on a reasonable level, otherwise it is questionable if energy savings would compensate for the extra rent components.


Additional Information

Ms Eva Bauer
Gbv - The Austrian Federation of Limited Profit Housing Associations
E-mail: ebauer@gbv.at
Web: www.gbv.at


Source: http://www.powerhouseeurope.eu/nc/cases_resources/case_studies/single_view/?tx_phecasestudies_pi3%5Bid%5D=175&tx_phecasestudies_pi3%5Bdisplaytype%5D=overview&cHash=