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Residential Scenia. Multi-family Passivhaus building in Mediterranean climate (Zaragoza, Spain)

Il Caso Evidenziato 2018 Highlighted Case
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Source: Construction 21

The simplicity in the implementation of techniques and local constructive solutions has been sought to achieve the passivhaus standard without compromising the economic profitability of the promotion. With this aim, high levels of insulation have been incorporated into the thermal envelope with low thermal transmittances, high performance in the openings through high performance carpentry as well as glasses of low thermal transmittance.

Scenia (phase II) is a new built collective residential complex, with 26 exclusive homes and garage with a total of 13,576 m2 located in one of the best areas of Zaragoza, Valdespartera-Montecanal with common garden area, pool and paddle court.

 

Through a coherent architecture with its climatic location, it puts in value the energetic efficiency in construction. On the other hand, it offers large homes around 150 m2 of useful space with very bright indoor area and very large terraces that incorporate greenhouses allowing them to be enjoyed during all seasons of the year.

 

 

Concerning the building envelope, the main façades of Scenia have north-south orientation, with wide gaps protected with deep overhangs to the south and smaller openings to the north, which minimize energy losses in winter. The closing solution, using a ventilated façade based on white limestone, gives the whole a very favorable solar absorption of the outer envelope, as its clear color reflects the solar radiation and keeps the external surface of the thermal insulation in shadow.

 

It is at the same time a strategic project for the Lobe group that has allowed prototyping the promotion of high energy efficiency and starting the strategic plan for the implementation of the almost zero consumption building through Passivhaus standard in all real estate projects.

 

The project, delivered by Grupo Lobe, has been designed, built and certified by Passivhaus standard, has been recognized at the 22nd iPHC (Passive House International Conference) in Munich by the Passivahus Institut and its founder, Wolfgang Feist, as one of the most efficient buildings in the world built by this standard. Scenia II is the first multifamily Passivhaus certified building in Aragon and the second in Spain.

 

Some energy figures:

 

-Primary energy need for a standard building : 182,00 kWhpe/m2.year

-Final Energy : 123,00 kWhfe/m2.year

-Breakdown for energy consumption (Passivhaus certification): 14 KWh / (m2a) in heating demand, 11 (W/m2) of heating load, 5 KWh/(m2a) of cooling demand, 5 (W/m2) of refrigeration load, water tightness 0.4 r/h and non-renewable primary energy consumption (passivhaus criterion) of 104 Kwh/(m2a). The energy reference surface of the building amounts to 4150 m2.

-Primary energy need : 104,00 kWhpe/m2.year

 

Envelope features

 

-Building Compactness Coefficient : 2,50

-Air Tightness Value : 0,41

-Uwall : 0,22 W/m2K

-Façade composition: Thermo-clay with ventilated stone façade, MW 12 cm outside. Resilience resolved by plaster + membrane

I) Cover: U = 0.233 W / m2K

II) Slab floor: U = 0.211 W / m2K

 

Heating and cooling system

 

-Heating and domestic hot water production: condensing gas boiler integrated by solar thermal panels

-Cooling system: reversible heat pump

-Ventilation system :nocturnal ventilation, free-cooling, double flow heat exchanger

Renewable energy production : 72,70 % of the energy consumed

-Solutions enhancing nature free gains :The building has collector galleries composed of simple glass on the south facade, about 50% of the façade. Opening of 100% of the glazed area in summer period.   

-Building Management System integrated: the building has the installation of a prototype of IoT in one of the houses that allows the monitoring of temperatures and energy consumption in real time, which makes it possible to value the energy efficiency of the building and corroborate design hypotheses to submit them to an improvement continues in the projects to be built in the coming years through this standard.         

 

-You can find more details here:

 

https://www.construction21.org/case-studies/es/residential-scenia-multi-family-passivhaus-building-in-mediterranean-climate-zaragoza-spain.html

 

Further information about the project:

 

·  http://www.residencialscenia.es/

·  http://www.grupolobe.com/index.php/passivhaus/

·  https://www.youtube.com/watch?v=0kBbdyhHfeY

 

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