supported by


The Public Housing Fund of the Municipality of Ljubljana

Tonka Grgic, Local Coordinator
Zarnikova 3, 1000 Ljubljana, Slovenia
Phone: 38613061417 Fax: 38613061578

9.-26.6.2009 - Ljubljana/Slovenia
Architectual Exhibition of Low Energy and Passive Buildings
Ljubljana REBECEE Architectural Exhibition on low energy and passive building designs took part at the Glass Pavilion of the City Hall. The opening ceremony took part on 9 June at noon. The opening speech was given by Tonka Grgic, National Coordinator of the REBECEE project on behalf ob Jožka Hegler, Managing Director of the Housing Fund of the Municipality of Ljubljana. She presented several realised and many on going investment projects financed by the Housing Fund and the importance of REBECEE movement in decision making towards low energy public housing and more intensive use of renewable energy sources in this sector.

Then Mr. Peter Friemert, REBECEE coordinator, presented Europe wide results of the REBECEE activities and invited the audience to visit several building developments being carried out under the REBECEE umbrella.

The final opening speech was given by Ljubljana Vice Meyer Mr. Jani Moderndorfer that pointed out the leading position of Ljubljana in Slovenian space speaking about energy efficiency and use of renewables in apartment buildings especially in public sector. He also asked for more financial incentives for public sector within the Slovenian Eco Fund budget and policy. These words were addressed to Mr Franc Beravs, the Managing Director of the Eco Fund that was also present at the opening.

The graphical architectural exhibition presented 16 projects:
• Two realised refurbishment projects managed by the Housing Fund of the Municipality of Ljubljana
• Four larger public housing developments in realisation phase by the Housing Fund of the Municipality of Ljubljana
• Two kindergardens, one new and one refurbishment, both in passive design
• Four student works on apartment passive buildings that has been awarded in international contest among European schools for architecture
• A passive one family house that has been awarded as the best passive house in 2008 National Contest for the best renewable housing project in Slovenia
• Two projects by the Šiška High School in Ljubljana. The school has its own 26 kWp PV power plant being some years in operation and has also installed various PV configurations for training purposes. The school presented two posters at the exhibition. On one poster they reported on their activities on PV field and on the second poster they reported on solar cookers activity: they realised various solar cookers and monitor their performance.
The exhibition panels from 2008 and 2009 architectural exhibition are on-line available through the virtual exhibition at

The exhibition has been opened 17 days for public with 50–60 daily visitors in summary 935 visitors, among them many foreigners. Their feedback in the exhibition book was very positive.
Along with the architectural graphical exhibition, six very informative realised projects were open for public visits. In the timeframe of the exhibition 10 guided tours to these developments were organised with presence of designers and professionals that were engaged in the realisation. 46 visitors joined these guided tours, most of them being in the investment preparation phase for their new house.

Steletova 8

Building at Steletova 8 in Ljubljana is residential tenant apartment building with 60 flats in 5 levels. The building has basement with some flats and storage rooms. There is around 3.781 square meters of usable floor area.
Current energy consumption: 75-85 kWh/m2 year Energy use after sanitation: 5-6 kWh/m2 year
Reduction level: 93 % Realisation: 2007

Kvedrova 17

Building at Kvedrova 17 in Ljubljana, represents a section of row typical post war blocks of apartments. It has basement with store rooms and five floors with 20 flats. There is around 1.312 square meters of usable floor area.
Current energy consumption: 75-85 kWh/m2 year
Energy use after sanitation: 16-17 kWh/m2 year
Reduction level: 80 % Realisation: 2007
Sanitation measures for both projects:
Additional thermal insulation on exterior walls, basement ceiling and attic ceiling
Replacement of windows and facade doors with energy efficient products
Application of mechanical ventilation systems with 75% heat recovery
Application of external thermal shutters
Sanitation of balcony thermal bridges.


In Stozice will be developed compact housing project with 15 single family low energy houses. Each house will have 175 m2 usable surface on building plots from 292 to 397 m2.
Specific energy use: 36-37 kWh/m2 year.

Polje 2

Investor, Public Building Fund of the municipality Ljubljana (»the Fund«) will develop 6 apartment blocks, each with 32 dwellings in Polje 2, Ljubljana not far away from already realised similar project. The apartments will be used for social tenant purpose. All 6 blocks will be designed in low energy standard and will be equipped with hydro sensible ventilation systems. Each of six blocks will have centralised energy production for heating and tap water. In one demo block, a thermal solar system and a PV solar system with 12 kW power will be designed.

Pipanova Road

Small living units at Pipanova Road will be realised in passive standard.The system is divided to collective and local energy segment. Collective part is composed of ventilation system with earth heat exchanger. Local heating will be carried out with local electric heaters for room heating and tap water. On the roof will be mounted a PV collector array with 14 kW peak power covering common electricity costs for running lighting, ventilation system and earth heat exchanger. Tenants will be not dependent on other common costs, they will pay only for space heating and for other individual electric supply costs, such as tap water and cooking.

Additionally, about twenty single family houses in low energy or passive standard will be realised. Projects presented at the exhibition will demonstrate a wide scale of techniques like quality thermal insulation, windows and doors, ventilation systems with high degree of heat recovery, earth heat exchangers, heat pumps, thermal solar systems and use of waste energy and will be selected in due time in order to select best examples.

For more information please see