Stakeholders

Function : Contractor

Promociones Las Provincias

Laura Valencia

 http://www.promocioneslasprovincias.com/

Function : Construction Manager

Construcciones Erro y Eugui

Iñigo Eugui

 http://www.erroyeugui.com/

Function : Designer

VArquitectos

Germán Velázquez

 http://www.varquitectos.com/

Contracting method

Lump-sum turnkey

Owner approach of sustainability

The objective was to get the project with the lowest possible heating demand, so as to be able to offer houses without energy mortgage. For this, the Passivhaus standard was proposed, which also offers many other advantages, such as maximum indoor air quality, avoid thermal bridges and therefore pathologies, maximum interior comfort, absence of noise thanks to high insulation and great air tightness, etc.

Architectural description

The architecture could not be seen in any case mortgaged by the constructive solutions of high energy efficiency. For this, VArquitectos has done an intense work during the drafting of the project in order to be able to provide thermally adequate solutions to the architectural requirements. The most notable case are the large terraces which do not compromise in absolute efficiency of the building, since they are outside the thermal envelope.

If you had to do it again?

Certain solutions implemented on site would be simplified.

Energy consumption

• Primary energy need : 5,90 kWhpe/m².year
• Primary energy need for standard building : 24,20 kWhpe/m².year

Calculation method : RD: 47/2007

• Final Energy : 26,80 kWhfe/m².year
Breakdown for energy consumption :

Heating 6.60kWh / m2a
ACS 17.76kWh / m2a
Cooling 2.5kWh / m2a

More information :

Demand for heating will be below 15kWh / m2a, as the Passivhaus certification proves.

Envelope performance

• Envelope U-Value : 0,17 W.m^-2.K^-1
More information :

The façade is composed of exterior to interior:
Ventilated composite aluminum facade
Thermal insulation of double density rock wool in 10cm
Waterproof coating
Half massive brick flagpole
Cast
Mineral wool 5cm
Cardboard plaster partition

• Building Compactness Coefficient : 0,34

Indicator : EN 13829 - n50 » (en 1/h-1)

• Air Tightness Value : 0,40

Systems

Heating system :
• Condensing gas boiler
• Low temperature floor heating
Hot water system :
• Condensing gas boiler
Cooling system :
• No cooling system
Ventilation system :
• Nocturnal ventilation
• Double flow heat exchanger
 La Ventilación de doble flujo con recuperación de calor cuenta con una distribucion en estrella. De este modo, el calibrado de la instalación es mas sencillo, y se garantiza la ausencia de ruidos por transmisión a través de los conductos.

Renewable systems :
• Solar Thermal
• Renewable energy production : 30,00 %
Other information on HVAC :

A radiant floor is provided for the heating. The system is oversized for existing requirements, but it did not seem feasible to market a product without heating.

Solutions enhancing nature free gains :

The project has been completely modeled with the PHPP, the computer tool of the Passivhaus Institute. This has allowed to contemplate absolutely all the thermal gains, be they natural or internal gains, as well as the losses. For that

GHG emissions

• GHG in use : 5,60 KgCO₂/m²/year
Methodology used :

CTE

• Building lifetime : 75,00 year(s)

Indoor Air quality

The quality of the indoor air is guaranteed through the double flow with heat recovery. The ppms will be stable between 500ppms and 1000ppms. When air is filtered, there will be no pollen, dust, pollution, etc.

Comfort

Health & comfort : In the absence of thermal bridges and gradients, and with the correct ventilation provided, no internal condescension will occur, avoiding the appearance of pathologies, mold, etc. The comfort will therefore be maximum, with a stable temperature of 21ºC, with a minimum expenditure on heating. In addition the absence of noises will be almost total thanks to the tightness of the houses and their high isolation.

Product

Zehnder Comfoair



Zehnder

Koldo Monreal

 http://www.onhaus.es/


Product category : Climatización / Ventilación, refrigeración

Mechanical system of double flow with recovery of heat. A recuperator has been placed per housing unit, with a star distribution.

The houses are not yet in use, but on the pilot floor, customers are very surprised by the absence of smells, noises, etc.

Construction and exploitation costs

• Reference global cost : 2 800,00 €
• Renewable energy systems cost : 45 000,00 €

Reference global cost/Dwelling : 2800

• Cost of studies : 100 000 €
• Total cost of the building : 3 150 356 €

Energy bill

• Forecasted energy bill/year : 5 600,00 €

Real energy cost/m2 : 2.49

Real energy cost/Dwelling : 193.1

Urban environment

Soto de Lezkairu is a neighborhood recently created in Pamplona. It is currently closed in more than 50%, and has all the services of a new neighborhood; Transport, bicycle lane, recreation areas and parks, pneumatic garbage collection, etc.

Land plot area

Land plot area : 1 150,00 m²

Built-up area

Built-up area : 45,00 %

Green space

Green space : 180,00

Parking spaces

Two basement floors, with space for 44 parking spaces, 29 storage rooms and 4 places for motorcycle.

Building Environmental Quality