Energy saving in apartment buildings Anne Gunnarshaug Lien Enova SF, Norway

1. Energy saving in apartment buildings Anne Gunnarshaug Lien Enova SF, Norway

2. Enova SF, State owned enterprise under the Ministry of Petroleum and Energy Established June 22. 2001 - in operation from January 1. 2002 30 people located in Trondheim

3. Enovas goals towards 2010: 4 TWh heat energy from renewable energy sources, heat pumps and from waste heat 3 TWh electricity from wind mills 5 TWh energy saving in households, buildings and industry, and other renewable energy sourses The total goal is 12 TWh saved energy and produced renewable energy in 2010

4. Two strategies for energy saving in existing buildings: 1 Energy management 2 Renovation with focus on energy

5. 1 Energy management in housing co-operatives monitor and visualize the energy use compare the results with other housing co-operatives influence user habits individual measurement of warm water use improved management control of ventilation temperature control lighting control

6. Specific energy use heated area Housing co-operative (16) Result: 5-10 % reduced energy use

7. 2 Renovation Focus on energy use from the early planning phase set a goal for the new energy use sign a contract for economic support The economic support is given in given in relation to the saving and the installation of renewable energy

8. Cool, comfort and cost The objectives for the projects: sustainable houses ecological houses healthy houses comfortable houses robust and user friendly systems cost effective houses houses for the future The Netherlands, Waaldijk, Dalem

9. Norway, Husby Terrasse in Stjørdal105 apartments (1969) Objectives: 50% reduction of delivered energy improved comfort modernised design Technical systems: Extra insulation, new windows Balanced ventilation system with heat recovery Control system

10. Norway, Husby Terrasse in Stjørdal105 apartments

11. Norway, Husby Terrasse in Stjørdal105 apartments External thermography of south facing facade. Balcony doors and windows have poor thermal quality and dominate the heat losses through the facade (lighter color show higher surface temperature and the highest heat loss)

12. Thermography of the interior show thermal bridges where the roof meet the wall and where the wall meet the floor. Also the electrical installations have very low surface temperatures. Norway, Husby Terrasse in Stjørdal105 apartments

14. Energy budget (net energy use)Apartment 105 m2Total energy use before: 27 000 kWhTotal energy use after: 13 000 kWh

15. Norway, Husby Amfi in Stjørdal56 new apartments Objectives: 50% reduction of delivered energy High indoor quality Robust and user friendly design Technical systems: Well insulated building envelope Heat recovery on ventilation air Heat pump take heat from grey water Norway, Husby Amfi

16. Energy performance: Total net energy use: 89 kWh/m² a Delivered energy: 61 kWh/m² a Saving including heat pump: 60 + 30 = 90 kWh/m² x 73 m² = 6 570 kWh per apartment Saving only for passive measures: 60 kWh/m² x 73 m² = 4 380 kWh per apartment Costs and payback time: Investment for only the passive house measures: 3 370 Euro Energy price of 0,12 Euro result in a payback time of 10 year Investment including heat pump: 5 060 Euro Energy price of 0,12 Euro result in a payback time 11 year (running cost for heat pump is included) Three room apartment, 73 m2 Norway, Husby Amfi

17. The goal for renovation is to optimize investments for energy saving, and investments for use of renewable energy sources, and investments in healthy, comfortable, sustainable houses and good design to get the good feeling!