ENERGY RENOVATION OF LANGKÆRPARKEN

Transcription

1 ENERGY RENOVATION OF LANGKÆRPARKEN

2 Energy renovation of Langkærparken Introduction by Torben Gade, GBL Energy and sustainability by Maria Gaardsted, Esbensen Consulting Engineers The Architecture by Lars Vind Scheerer, Nova5 Architects

3 Langkærparken a social housing district at Århus

4 Langkærparken a social housing district at Århus History Background Vision

5 Why energy renovation? 40 % of the total energy consumption from buildings 20 % is social housing (a total of dwellings)

6 Advantages of energy renovation Economy Inddoor comfort CO2 emissions Valorisation Secure the future

7 Overall plan for the energy renovation project a. 4 energy classes b. Tender select 1 case c. Parameter study d. Evaluation, reports and dissemination

8 The building regulation in Denmark Energy frame kwh/m 2 år: Heating Ventilation Cooling Hot water Be06 3 categories for new buildings

9 Existing energy consumption Energy classes

10 Corresponding CO2 emissions Existing building

11 Expected results Comparasion of hard parameters such as: Calculated energy consumption Calculated environmental effects Construction/operation/total economy Consequences of the rent for the citizens Comparasion of soft parameters such as: Architectural qualities Comfort Inddoor climate Interior design Construction technical possibilities

12 General conditions for all 4 cases Coating principal Optimizing the climate screen in all cases: Insulation thicknesses Elimination of cold bridges Focus on airtightness

13 kwh/m2 år Case 1 Standard (BR08) Appr. 70 kwh/m 2 year Extra insulation in walls, ceiling and floor Opgrading all windows except in the bathroom New mechanical ventilation aggregate with heat recovery Eksisterende energiforbrug Energiklasser Energy classes BR08 LEK2 LEK1 LEK0

14 kwh/m2 år Case 2 Low energy class 2 Appr. 50 kwh/m 2 year Energiklasser Energy classes Extra insulation in walls, ceiling and floor Opgrading all windows except in the bathroom New mechanical ventilation aggregate with heat recovery Implementation of solar heating (appr. 1 m 2 pr. appartment) 0 Eksisterende energiforbrug BR08 LEK2 LEK1 LEK0 Disconnection of district heating will be investigated

15 kwh/m2 år Case 3 Low energy class 1 Appr. 30 kwh/m 2 year Extra insulation in walls, ceiling and floor Opgrading all windows except in the bathroom New mechanical ventilation aggregate with heat recovery Implementation of solar heating (appr. 3 m 2 pr. appartment) Implementation of solar cells (appr. 4 m 2 pr. appartment) Disconnection of district heating will be investigated Eksisterende energiforbrug Energiklasser Energy classes BR08 LEK2 LEK1 LEK0

16 kwh/m2 år Case 4 Low energy class 0 Appr. 18 kwh/m 2 year Extra insulation in walls, ceiling and floor Opgrading all windows except in the bathroom New mechanical ventilation aggregate with heat recovery Implementation of solar heating (appr. 3 m 2 pr. appartment) Implementation of solar cells (appr. 12 m 2 pr. appartment) Disconnection of district heating will be investigated Eksisterende energiforbrug Energiklasser Energy classes BR08 LEK2 LEK1 LEK0

17 Energy principles

18 Working methodology of the project Integrated process: Integrated energy design Workshops External advisors Communication

19 Energy supply District heating from AVÅ (Affald Varme Århus) Solar heating PVs According to BR08 only new buildings can be disconnected to the district heating grid when fulfulling Low Energy Class 2 or 1 It is a challenge for energy renovation projects if they are placed in an area with district heating as the fee of district heating is divided into 2 parts: Variable costs (proportional to the energy consumption) Non-variable costs (fixed fee supposed to cover all expenses according to maintenance of the grid)

20 Primary energy source district heating AVÅ have future plans with low temperature district heating AVÅ has shown interest in the climate project and are open to a dialouge in order to find a suitable fee system Three principals have been discussed: 1. District heating with T = (60/40) C and reduced fees 2. Connection to the return pipes with T= (30-35) C and reduced fees 3. Complete disconnection from district heating The economic consequences will be taken into consideration when selecting the case at a later stage.

21 Conclusions Criterias for succesful energy: Something more... Communication Future prospects