The Lodenareal Passive House apartment complex in Innsbruck, Austria is the world's largest certified passive house with 354 residential units. It achieves an extremely low heating energy demand of 13 kWh/m2a through high insulation standards, a central pellet boiler, solar thermal panels, and balanced ventilation. Residents' energy consumption has remained consistently low due to the building's efficient envelope and passive design which minimizes user impact on energy usage. The development has reduced CO2 emissions by 680 tons annually and serves as a model for future sustainable, low-energy housing.

1. Case study
Lodenareal Passive House Apartment Complex, Innsbruck
By;Sipan Hayran
Supervisor: Haval A. Abdulkareem

2. CONTENT
1. Introduction
2. Design Intentions
3. In Reality
4. Conclusion
5. Reference

3. INTRODUCTION
 New World‘s largest certified Passive House (in 2009)
 Location: Innsbruck / Tyrol
 Building use: Social Housing, Building 4, 354 residential units
 Architecture: din a 4 & K 2 team architects, on behalf of the
Neue Heimat Tirol
 Professional planning Passive House: Herz & Lang GmbH
 Type of building: Concrete construction with an external
insulation system
 Energy concept: Pellet, peak gas Solar plant Comfort ventilation
 Energy reference area: 26,000 m² (PHPP)
 Energy demand: 13 kWh / (m² a) (PHPP) 8 kWh / (m² a) (OIB-
Tirolean Passivhaus)
 Ecological aspects: renewable energy Pilot Project for Climate
Protection and the buildings of the future in Europe

5. DESIGN INTENTIONS:
Important for us were as a project goal following points:
efficient envelope – low technology – easy to operate – low heating and
running costs – environmental protection – independence from energy
suppliers
In Reality
1. Heating and Hot Water
2. Solar Thermal
3. Ventilation
4. Air Tightness
5. Windows and Shading
6. Work with Residents
7. Thermal envelope

6.  Heating and Hot Water
 A central heating located between the two building blocks is dstribuiting heat to the
individual buildings. Heat is generated with a pellets boiler and a gas condensing
boiler, 80% of the annual energy demand is covered by pellets.
 Heating Demand: 14.5 W/m²Ka (4.43kBTU/ft²/a). Thanks to the low heating demand
only pheripheral zones of rooms are heated with the floor heating.
The average space heat consumption for all apartments was 17.6 kWh/m²a (in the first year of
measurement) and 16.3 kWh/m²a in the second year of measurement. Adjusted for temperature and
climate, this results in 13.6 kWh/m²a in the first year and 14.6 kWh/m²a in the second year.

7. Work with Residents
One of the objectives was raising awareness on ecological concerns. Anyway, in the
Passivhause-condomnium LODENAREAL, energy consumption remains constantly low,
independent of the user behaviour.
o Solar Thermal
o About 1050sq meters of solar collectors are installed on the roofs. This is the
equivalent of about 3swm per flat, The actual energy supply of the solar palnt stands
for at least 350kWh/m2 collector surface.
o The energy generated by the solar plant more than 367.500k/year. The gained energy
is buffered with heat exchangers in 5 resp 6 buffer storages (per substation) with
2.500 litres each, stratified by means of switch valves and then fed into the supply
pipework.
o The buffer storages are completely cased, hollow spaces are insulated with cellulose
flakes, so that energy losses are minimized.

8. Ventilation
•Ventilation is centralized in the basement. The fresh air intake functions through a
ventilation towers with filters in the courtyard at a height of 3 meters. Air is tempered with
cross-stream exchangers.
•Fresh air is supplied into the bed and living room with wall-mounted air diffuser. Due to the
special sound absorber the sound level at the air diffuser level is only about 22db.
Air Tightness
Airtightness: 0.20 ACH50.
Windows and Shading
Triple glazed Windows, U-value=0.78 W/m²K (R-
7.5).

9. THERMAL ENVELOPE
Wall assembly, U-value=0.13 W/m²k (R-43.7)
1 cm plaster finish
24-30 cm EIFS (EPS)
18 cm reinforced concrete
1.5 cm plaster
Roof assembly, U-value=0.11 W/m²k (R-51.6)
10 cm extensive planting
waterproofing
30-36 cm EPS
Vapor barrier
20-31 cm reinforced concrete deck
Basement Floor assembly, U-value=0.12 W/m²k (R-47.4)
Wood flooring
Screed and foil
3 cm impact insulation
20 cm reinforced concrete deck
26 cm insulation
20c
20c
18c
15c
-14c
-14c

10. U-value=0.78 W/m²K (R-7.5
Solar system
VENTELATION

12. CONCLUSION
 Energy:
 Reduction of the yearly production of CO2by 680 tons
 80% lower energy demand
 Solid construction with a high-standard, airproof building envelope according to passive
construction standards
 Approx. 1.050 m² solar panels (3 m² / living unit)
 Energy consumption < 15 kWh/m² per annum (according to PHPP, "Programm Passivhaus-
Projektierungs-Paket”)
 Controlled room ventilation / average air-exchange rate 0,35/h
 Blower Door-Test resulting in n50 =0,20 (clearly below the requested value of 0,60)
 Thermo-conducting cabling in the basement (insulation min. 1,5 times higher than required
standards)
 Seismic load is transferred to interior staircases
 Constructive separation of structural components as prevention of thermal bridges

13. REFERENCE
 http://media.igpassivhus.se/Passive_House_Brochure.pdf
 http://www.passivhausprojekte.de/index.php?lang=en#d_1225
 https://bruteforcecollaborative.wordpress.com/2010/08/16/phbdw-passivhaus-bau-der-woche-09/
 http://www.holzforum-
allgaeu.de/holzforum/allgaeu/web.nsf/gfx/EFD53969CCFF7D3EC1257DCB002D0018/$file/2015.01.12_Passi
vhaus_Consulting_Broschuere.pdf
 http://passiv.de/former_conferences/fuenfzehnte/englisch/09_press.htm
 http://www.passivehouse.org.cn/zk/gwal/429.html
 http://www.buildup.eu/cases/6892
 http://www.worldchanging.com/archives/011549.html
 http://www.amazon.com/s/ref=nb_sb_ss_c_0_16?url=search-alias%3Dstripbooks&field-
keywords=passive+house+design&sprefix=passive+house+de%2Caps%2C384