Reducing energy consumption in a historical school building

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1 Reducing energy consumption in a historical school building Demonstration building within the EU project «School of the Future» and with Enova Geir Andersen, Drammen Eiendom KF Sverre Tangen, Glass og Fasadeforeningen Karin Buvik, SINTEF Byggforsk Trondheim SINTEF Building and Infrastructure

2 EU project «School of the Future» Scope: Four demonstration buildings are included, one in each of the participating countries Denmark, Germany, Italy and Norway Purpose: To achieve high performance building levels when retrofitting schools, i.e. low energy consumption and good indoor climate conditions Objectives: The general energy target is to reduce the energy consumption by 75 %

3 Method 3 main pillars School of the Future Demonstration Four school buildings Co operation between building owners, research institutes and industrial companies Research Review of publications and projects Technology screening Design guidelines Calculation tool for school buildings Dissemination Training seminars for facility managers / caretakers, teachers and pupils Publishing to different target groups

4 Drammen's commitment to sustainable development Drammen municipality are focused on development of the urban environment, and to take a national leading role in sustainable building. Drammen was appointed the runner-up in the Nordic Energy Council Award 2011

5 Our Passivhouse. (Build and under construction.) Marienlyst school ( from 2010 ) Fjell kindergarten ( from 2010 ) Home for dementia ( under construction ) Frydenhaug school (ready for construction) This only 4 % off our building we have to rehabilitat existing to

6 Architect Arnstein Arneberg Brandengen School primary school from UN hall Oslo city hall

7 Brandengen School 2011, before retrofitting

8 Brandengen School 2012 New windows and roof cladding

9 Brandengen School Objectives: The target energy savings set for Brandengen School is somewhat lower than the general target, because of the historical buildings. Total energy use Brandengen before retrofitting National regulation TEK10 energy frame Brandengen with planned measures 208 kwh/m²a 120 kwh/m²a (Incl. equipment 13 ) 68 kwh/m²a Estimated energy savings 67 %

10 Startet in 2003 with ventilation and lighting New lighting fixtures with energy efficient T5 technology and presence detectors. Balanced demand based ventilation systems with high efficient (rotating) heat recovery. existing old ducts was used to give a gentle refurbishment..

11 Windows New passive house windows contribute to both better indoor comfort and reduced energy and maintenance cost. Alu cladding. Thanks to the glazing's low solar energy transmittance the exterior sunscreen devices can be removed, in order to restore the façades aesthetics as close as possible to the original historic look. Orginal windows from 1913 are being restored to glazing U-value 1,0

12 Details new windows The old windows had wooden frames and bars. The new windows have wooden frames (split/insulated) with exterior aluminium cladding. To get a similar look as the old painted frames, the aluminium profiles got a lacquer finish less bright than standard.

13 New windows, total U- value 0,8 Glazing specifications U-value Light transmission Ground floor with exterior security glazing: Lam m/energi 2s VKS/Ar 6,38ES+16G+4+16G+ES6 Solar glazing on south and west façades: SKN165 m/energi VKS/Ar 6*-14G+4+16G+ES4 Other windows have standard glazing: Energi 2s VKS/Ar 4ES+16G+4+16G+ES4 G-value 0, , , Additional cost compared to standard windows are low and it is much cheaper than to make a copy of the orginal window.

14 Insulation Insulation attic 30 cm Insulation mansard roof 30 cm Leca Challenges- building physics The mansard wall and the floor in the attic, have got additional insulation. Earlier heat leakage from the roof has caused icicles which have been very expensive to remove Walls in basement Digging for exterior insulation and drainage - and collector pipes for heat pump

15 Insulation of ventilation ducts A demand based ventilation system was installed in Ventilation ducts were placed in the attic. Before In 2011 an additional layer of 10 cm insulation were wrapped around the ducts. After

16 The oil burners will be replaced by a heat pump who utilazing heat from the ground Drilling for the green gold 19 hole Each 250 m deep

17 Heat pump Space heating and heating of ventilation air. The heat pump have 4 compressors and is dimensioned to 85 % of energy demand and can delivered 70c heat. Under normal conditions this is enough, and the backup system of electrical and bio heat will be used only a few days when its very cold. Heat pump green plant The green gold energy from the ground. The collector

18 Control of energy use and indoor climate Heating Energy production Ventilation Climate «Monitoring central» BMS (Building management system ) and monitoring system for energy consumption. It is in use for all our 75 buildings.

19 Indoor climate. User questionnaire and measurements DONE: December 2011, prior to changing windows: Questionnaire about air quality and temperatures Measurements of CO 2 concentrations Measurements of temperature levels PLANNED: Student thesis at bachelor and master levels PLANNED: Questionnaire and measurements after retrofitting. Winter season and summer season

20 Drammen's commitment continuation By participating in the EU project School of the Future Drammen municipality wants to contribute particularly to rice the level of knowledge concerning retrofitting. Involving Brandengen School as a demonstration building within this EU project, we are aiming to show that future high performance building levels are possible even in a historical building from 1913.

21 From research to application Three main phases in sustainable building: 1. Introduction 2. Growth 3. Volume International Regional Regulation intensification cooperation demonstration step by step 1. Uncovering lack of knowledge 2. Seeing is believing. Practice as you preach 3. Knowledge building. Regulations

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