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

Last modified by the author on 08/06/2018 - 16:19
  • Building Type : Collective housing > 50m
  • Construction Year : 2017
  • Delivery year : 2018
  • Address 1 - street : 50012 ZARAGOZA, España
  • Climate zone : [Csa] Interior Mediterranean - Mild with dry, hot summer.

  • Net Floor Area : 4 150 m2
  • Construction/refurbishment cost : 3 016 948 €
  • Number of Dwelling : 26 Dwelling
  • Cost/m2 : 726.98 €/m2

Proposed by :

Certifications :

  • Primary energy need
    104 kWhpe/m2.year
    (Calculation method : RD: 47/2007 )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building


Scenia (phase II) is a collective residential project of new construction, with 26 exclusive homes and garage with a total of 13,576 m2 built 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 spaces and very large terraces that incorporate greenhouses allowing them to be enjoyed during all seasons of the year.

A strategic project for the implementation of EECN

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 underway, completely transforming the business organization through the generation of an internal area of ​​energy efficiency responsible for the energy design of the buildings, the continuous training of its technicians and subcontractors and other changes in the management of the projects and the execution processes that allow the business group to anticipate the directive of obligatory fulfillment of the year 2020 turning into a dynamizer of the sector in the field of the construction energetically efficient inside his scope of performance.

Project 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.

See more details about this project

Data reliability

3rd part certified


    Grupo Lobe

    C/ Monasterio Descalzas Reales 26 Polígono Alcalde Caballero 50014 Zaragoza • 976 734 142

Construction Manager

    Grupo Lobe

    C/ Monasterio Descalzas Reales 26 Polígono Alcalde Caballero 50014 Zaragoza • 976 734 142


    Other consultancy agency


    C/ Monasterio Descalzas Reales 26 Polígono Alcalde Caballero 50014 Zaragoza • 976 734 142

    Project energetic design, justification and passivhaus standard

Contracting method

Lump-sum turnkey

Owner approach of sustainability

Sustainable approach to the energy and energy efficiency section of the building, building through international standards such as Passivhaus, which minimizes the demands for climate control and the integration of renewable energies to reduce the rest of the building's energy consumption. Energy consumption in residential and commercial buildings continues to represent approximately 40% of total final energy consumption and 36% of the total CO2 emissions of the European Union, with the consequent effect on climate change. Given this scenario, there is a growing collective interest to act in a responsible manner from the environmental point of view, taking into account the rational use of energy and the improvement of the quality of life of people. In this sense, Grupo Lobe wants to have a key and differentiating role, assuming these challenges as its own and incorporating them into its business model, with the ambition and commitment to become a company that promotes the construction of high energy efficiency and low carbon.


In order to respond to this commitment, during this year the Strategic Energy Efficiency Plan adopted in 2015 has been put into practice, which proposes the promotion of highly efficient buildings, with almost zero energy consumption (nZEB) and which anticipates the European Directive 2010/31 / EU of mandatory compliance for the year 2020, thus exceeding the normative requirements recently published in the Basic Energy Saving Document of the Technical Building Code (CTE) of June 2017, relating to the definition of the almost zero consumption building.

The implementation of the building of almost zero consumption in the promotions has been made by adopting the German construction standard Passivhaus, the world's most demanding certificate in terms of comfort and energy efficiency. This standard has already been taken as normative reference by other countries of the European Union. Passivhaus guarantees energy savings of up to 90% compared to existing buildings and requires greater rigor in quality control and execution of work, through the application of 5 basic principles: high degree of insulation in the thermal envelope, high performance in carpentry and glazing, waterproofing solutions that reduce air infiltration, thermal bridge free design and mechanical ventilation with heat recovery. Given the versatility of the passivhaus standard, not establishing a method or a constructive system, and leaving this choice at the discretion of the designer, it has been possible to implement constructive solutions of local tradition that meet the requirements and limitations defined in the standard regardless of the system constructive employee.

Likewise, the Lobe group continues to carry out constant research into new construction procedures that involve a substantial improvement in the energy performance of buildings, advocating innovative industrialized methods that allow environmental benefits through the reduction of energy consumption and CO2 emissions during the construction processes.

Additionally, and despite the fact that the current CTE regulations do not contemplate it, there are more and more arguments in favor of working on the tightness of the building envelope as required by the standard: minimize energy losses, reduce the risk of interstitial condensation or avoid the entry of aggressive external agents or contamination.

The energy performance of the facilities is considered one more factor to take into account in the improvement of the energy efficiency of the building, consequently, the design of thermal installations that work at a low temperature and that incorporate high performance equipment such as aerotermia guaranteeing great energy savings and complementing the low energy demand of a building designed by passivhaus criteria. At the same time, unique advances are promoted in one of the future challenges, the integration of renewable energies, such as solar thermal energy or photovoltaic solar energy that will increase energy savings and favor local energy production.


At this moment Grupo Lobe is pioneering the promotion and construction of the first residential buildings in height through the Passivhaus standard in the community of Aragón and other communities such as Madrid or the Valencian community, establishing itself as a reference company for the sector.

In this way, the LOBE Group feels the responsibility to continue generating value, confidence and commercial differentiation through increasingly sustainable practices, responding to a growing demand in society. Their determination to respect the environment and change the energy model for the benefit of society is reflected in the prioritization of energy efficient and sustainable construction techniques and in working under standards or internationally recognized labels that value not only the consumption of energy in the use phase, but also in its construction phase, including other aspects such as the integral management of the water cycle.

In order to evaluate the effectiveness of these techniques, the implementation of Technologies that allow to measure and value the comfort, environmental, energy, water and on-site energy generation parameters of buildings is adopted.

Architectural description

The project proposal responds to the requirements of the residential area plan developed under bioclimatic criteria, respecting their areas of movement, orientation, setbacks, flights, maximum heights, occupancy and buildability indicated by regulations that facilitate the achievement of a building with very high energy efficiency by putting value on its passive architecture.

The project is organized in a single block with predominance of its facades in the North-South components, with dwellings arranged in a linear scheme of two dwellings per communication core optimizing space and its functionality. The houses are distributed by differentiating the area from night to day, with terraces of great depth in the South orientation and the incorporation of collector galleries in this same orientation that contribute to minimize the heating demands. The general envelope of the building is set by a ventilated facade finished in white very beneficial for the summer period in the climatic location of Zaragoza. A very differentiated treatment has been made between the North and South facades, based on the needs of access to the sun and solar blockade that contribute to the formal and plastic expression of the building.


If you had to do it again?

Reduce systems that depend on fossil fuels, betting on electricity as the main source of primary energy. Increase the installation of renewable energies, mainly solar photovoltaic. Include water efficiency mechanisms. In the following projects the passivhaus standard is maintained with proposals for integration of EERR to bet on shared self-consumption and distributed generation.

Energy consumption

  • 104,00 kWhpe/m2.year
  • 182,00 kWhpe/m2.year
  • RD: 47/2007

  • 123,00 kWhfe/m2.year
  • Passivhaus classic 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, watertightness 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.

    Energy Certification CTE:

    10.02 Kwh / m2a) in demand for Heating, 12.57 Kwh / (m2a) in cooling demand, 26.88 Kwh / (m2a) in non-renewable primary energy consumption and 5.22 KgCO2 / (m2a).

Envelope performance

  • 0,22 W.m-2.K-1
  • 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.

    Façade composition: Thermo-clay with ventilated stone façade, MW 12 cm outside.
    Resilience resolved by plaster + membrane
    Cover: U = 0.233 W / m2K
    Slab floor: U = 0.211 W / m2K

  • 2,50
  • EN 13829 - n50 » (en 1/h-1)

  • 0,41


    • Condensing gas boiler
    • Solar thermal
    • Condensing gas boiler
    • Solar Thermal
    • Reversible heat pump
    • Nocturnal ventilation
    • Free-cooling
    • Double flow heat exchanger
    • Solar Thermal
  • 72,70 %
  •  de la demanda total de ACS

    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.

Smart Building

    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.

GHG emissions

  • 5,22 KgCO2/m2/year
  • Energy certification RD 235/2013

Water management

    The building has collection and discharge to the separative network of rainwater and wastewater.

Indoor Air quality

    The building has a continuous mechanical ventilation system with heat recovery that guarantees air renewal values ​​at the time between 0.3 and 0.4 1 / h in all rooms, with an average of 30 m3 / person. There is no room in the building that is not ventilated. The system of ventilation air impulsion and extraction has been balanced, ensuring that the air speed does not exceed 2 m / s in output to avoid unwanted air currents and an adequate sound level. The system has filters in entrance and exit to the outside to limit the number of particles in suspension present in the air of the house. Concentration CO2 <900 ppm. Relative humidity around 50% throughout the year. The air extraction ducts are always in the upper part of the room.


    The building has been designed and built with attention to the elimination and treatment of thermal bridges incorporating elements of low thermal conductivity, which have been analyzed in detail in the design phase through its modeling and calculation by finite element program. This guarantees the non-existence of condensation and mold in all the points of the enclosure, be it walls, floors or joinery. The temperature of enclosures is always above 16º C. The building has an additional cooling system to guarantee the absence of overheating. The building's set temperature is 20ºC in winter and 25ºC in summer.
    The user can manipulate all the windows of all the spaces, choose between three ventilation flows (absence, passivhaus and party), assign a different temperature for heating and cooling, and activate the additional shading systems and glazing located on the south facade. In turn, it can intervene directly in the lighting systems.

    <900 ppm


    The effectiveness of the reduction of outdoor air noise due to the characteristics of the massive envelope with double-leaf insulation (12 cm of mineral wool + 2 cm of EPS inside), of the carpentry, which have triple glass, frames high performance and highly insulated blind boxes. The experience of the users demonstrates their capacity to reduce almost completely the noise coming from the air traffic of commercial and military aircraft. The building is located in the area affected by the Airport and Air Base of Zaragoza (Air Force).

    Acoustic tests carried out in-situ after occupancy guarantee acoustic characteristics of their enclosures that reduce the transmission of airborne sound, noise from impacts and noise and vibrations typical of the building's facilities.


    Zehnder ComfoAir 350


    +34 935824595

    The comfort ventilation unit Zehnder ComfoAir 350 has been developed for use in high-rise residential and commercial buildings. It combines maximum comfort with easy control, high efficiency and flexible integration in technological devices for housing. The CA350 heat recovery fans can move 370 m³ / h of air at an external pressure of 100 Pa.
    The counter-current integrated exchanger achieves an efficiency of up to 95%. For the comfort of the user this means the absence of unpleasant air currents, since the supply air, even at freezing temperatures, is heated practically up to room temperature.

    Correct operation

    Vidrios Guardian Glass

    GuardianGlass - Inrialsa

    GuardianGlass: +34 948 817 239 - Inrialsa : +34 941 449 199 -

    Triple glass that incorporates solar control sheets to limit the transmission of sunlight to the interior (solar factor g = 46.8, light transmittance of 69.6%) and low emissive to reflect the infrared into the interior of the house, optimizing its behavior in the presence of heat losses in this range (Uglass = 0.6 W / m2K). Filled chambers 90% argon 10% air.

    Correct behavior

    Monitoring and sensorization IoT

    EFOR Internet y Tecnología

    976 46 76 76

    Accessibility of data from application for mobile devices and internet. Fifthplay.
    The following parameters are monitored:
    Interior temperature (per stay)
    Outside temperature
    Relative humidity (per stay)
    Disaggregated electrical consumption. Kitchen (appliances), ventilation, AACC and general consumption.

    It allows the valorisation of energy efficiency from the monitoring and sensorization of energy and environmental parameters. Obtaining and continuous improvement of systems and uses based on real data of the constructed building.

    Health guarantee: Control of compliance with optimal temperature levels (20ºC-25ºC), relative humidity (50%)
    Data accessibility: Consumption reading application through mobile devices and internet.
    Awareness: Adoption of responsible consumption habits by the user.
    Economic and energy savings: Real information to detect and correct inefficiencies.
    Research and development: Innovative data collection and analysis project in the first multi-family building built EECN and passivhaus certificate in the community of Aragon.

Construction and exploitation costs

  • 3 016 947

Urban environment

Residencial Scenia has an architecture consistent with its urban location: it is located within the so-called "Ecocity of Valdespartera", a partial plan for sustainable urban planning. The urban layout of the area addresses environmental aspects such as the orientation of the buildings, the separate collection of wastewater and rainwater that are reused in the irrigation of green areas or the pneumatic network of separative waste collection, which works with energy electricity from renewable energies.

The accessibility by means of public transport is simple through tram and urban buses. The building has several nearby kindergartens, primary and secondary schools as well as a supermarket, several shops nearby and even a residence for the elderly. It is surrounded by large green areas.

Land plot area

5 381,00 m2

Green space

2 178,75

Parking spaces

The building includes 52 parking spaces

Building Environmental Quality

  • energy efficiency

Reasons for participating in the competition(s)

La construcción de Scenia

Se ha buscado la sencillez en la implementación de técnicas y soluciones constructivas locales que permitan alcanzar el estándar passivhaus sin comprometer la rentabilidad económica de la promoción. Para ello se han incorporado altos niveles de aislamiento en la envolvente térmica con bajas transmitancias térmicas de U=0,22-0,23 W/(m2K), altas prestaciones en los huecos mediante carpinterías de altas prestaciones con U=1,0 W/(m2K) y vidrios de baja transmitancia térmica con valor U=0,6 W/(m2K). Se ha procurado una construcción libre de puentes térmicos tratando y justificando todos los casos existentes para garantizar el cumplimiento de pérdidas de energía, riesgo de condensaciones superficiales, aparición de moho y temperaturas de confort consiguiendo que las pérdidas de energía por puentes térmicos sobre el global de la demanda sólo supongan un 3,5 %. Se cuenta por otro lado con un 82 % de eficiencia en la recuperación de calor de la instalación de ventilación mecánica una vez instalada, garantizado por una ventilación continua del aire totalmente controlada debido al alto nivel de estanqueidad del edificio.

El aporte mínimo de energía necesario para garantizar condiciones de confort se ha resuelto mediante medidas activas de alta eficiencia como es la instalación colectiva de calefacción con caldera de condensación y unidades terminales por suelo radiante que permiten trabajar a baja temperatura o equipos de aire acondicionado de alta eficiencia. También se atiende a la reducción del consumo de energía eléctrica mediante la incorporación de electrodomésticos de alta eficiencia e Iluminación LED.

Así mismo, se ha realizado integración de energía renovable para cubrir un aporte del 70% de la demanda de ACS mediante instalación colectiva solar térmica.

Como resultado se ha obtenido un buen balance energético, dónde además de aplicar los principios del estándar se han incorporado otros criterios generales de diseño pasivo coherentes con la localización climática de Zaragoza que garantizan una alta eficiencia del edificio en clima mediterráneo y especialmente en el caso de refrigeración.


 -Certificación passivhaus classic

14 Kwh/ (m2a) en demanda de calefacción, 11 (w/m2) de carga de calefacción, 5 Kwh/(m2a) de demanda de calefacción, 5 (W/m2) de carga de refrigeración, estanqueidad 0,4 r/h y consumo de energía primaria no renovable (criterio passivhaus) de 104 Kwh/(m2a). La superficie de referencia energética del edificio asciende a 4150 m2

-Certficiación Energética CTE

10.02 Kwh/m2a) en demanda de Calefacción, 12.57 Kwh/(m2a) en demanda de refrigeración, 26,88 Kwh/(m2a) en consumo de energía primaria no renovable y 5,22 KgCO2/(m2a)

La estimación de costes para la demanda de climatización del edificio considerando una consigna de 20 ºC en período frío y 25 ºC en período cálido se estima en 1 €/m2·año lo que supone ahorros de hasta un 90 % en comparación con construcciones anteriores a CTE y de hasta el 75% frente a construcciones CTE 2006.

El edificio cuenta con la instalación de un prototipo de IoT en una de las viviendas que permite la monitorización de temperaturas y consumos energéticos en tiempo real, lo que permite poner en valor la eficiencia energética del edificio y corroborar hipótesis de diseño para someterlas a una mejora continua en los proyectos a construir en los próximos años mediante este estándar.

Building candidate in the category

Energy & Temperate Climates

Energy & Temperate Climates

Smart Building

Smart Building

Users' Choice

Users' Choice

Green Solutions Awards 2018 - Buildings

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Clara Lorente

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Green Solutions Awards 2018 - Buildings