Positive Social Housing - 3-room house

  • Building Type : Isolated or semi-detached house
  • Construction Year : 2013
  • Delivery year : 2013
  • Address 1 - street : 36 rue Georges Clémenceau 11400 CASTELNAUDARY, France
  • Climate zone : [Csa] Interior Mediterranean - Mild with dry, hot summer.

  • Net Floor Area : 89 m2
  • Construction/refurbishment cost : 104 949 €
  • Cost/m2 : 1179.2 €/m2

Certifications :

  • Primary energy need :
    41 kWhep/m2.an
    (Calculation method : RT 2012 )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

The Positive Social Housing project is primarily a sustainable development project on the scale of a territory. It brought together the city of Castelanaudary, the social landlord Habitat Audois, students and teachers of the Building trades Andreossy Highschool of Castelnaudary and TERREAL company; a constructive solutions manufacturer for building envelopes and a major economic player of the region.

The project is the brainchild of four partners:

  • Imagine an exemplary territorial project of Vallons de Griffoul Eco-district consisting in two positive energy houses using local materials mainly from extracted locally clay. The cost of construction and maintenance of the houses had to be compatible with the financing of social housing and therefore controlled. The materials selection and systems are robus and simple to operate. It is also designing efficient housings in which the human factor remains at the center.
  • Build: Positive Social housing is a concrete project. Two houses were built by local actors, introducing innovative techniques with the support of Terreal for their implementation. The construction was achieved in accordance with the principles of bioclimatic architecture and particularly focused on the summer comfort for the future residents.
  • Understand: The Positive Social housing project allowed each player to understand how we imagine and how to build buildings that can compensate all consumptions of the house and its occupants by producing renewable energy at an exemplary cost. This project was also an excellent teaching tool for students in high school who imagined the technical solutions for shaders.

The Positive Social Housing project is also the practical support for the research conducted in 2015 by a PhD student at the University of CERTOP Toulouse. The research aimed to understanding the influence of the occupant behavior on the home performance, in order to work on supporting change management. That way, these positive energy buildings stay positive even with their inhabitants, and without coercion, to really meet the challenge of energy sobriety.

This case study concerns the 3-room house.

See more details about this project

 http://www.habitatsocialpositif.com/

Data reliability

3rd part certified

Stakeholders

    Manufacturer

    TERREAL

    isabelle Dorgeret

    Contribution to the initiation and project success


    Investor

    Habitat Audois

    Monsieur Armand Cathala

    Contribution to the initiation and success of the project, social landlord and owner of the house


    Environmental consultancy

    Ville de Castelnaudary

    Monsieur le Maire

    Contribution to the initiation and project success


    Others

    Lycée Andréossy de Castelnaudary

    Monsieur le Proviseur

    Contribution to the initiation and project success


    Construction company

    Les Provinciales

    M. Ludovic Garcia

    Builder


    Designer

    AEAA

    Cécile Escourrou

    Architect


    Thermal consultancy agency

    CITE Vergé

    Alain Biard

    Thermal calculations


    Certification company

    CEQUAMI

    Maxime Parent Du Chatelet

    Certification Bepos Effinergie 2013 and Effinergie +


    Others

    CERTOP

    Madame Zelem

    Tenure of housing, habitat and occupants interraction

Contracting method

Off-plan

Owner approach of sustainability

The goal was to learn and understand how to make a positive energy house controlled cost with actors and local materials, furthermore, to understand how it is occupied by the inhabitants to subsequently propose technical solutions that will adapt to occupiers and not the reverse. Make houses really positive energy!

Architectural description

The project consists of two adjoining houses T3 and T4 using building materials made locally and respecting the principles of bioclimatic architecture

Energy consumption

  • 41,00 kWhep/m2.an
  • 62,00 kWhep/m2.an
  • RT 2012

  • 53,17 kWhef/m2.an
  • Actual energy consumption 2014:
    Heating = 35.89 / m² / year
    Lighting + ventilation auxiliaries = 5.81 kWef / m² / year
    Hot water = 1.45 kWef / m² / year
    All 5 usages of RT2012 real final energy = 43.15 kWef/ m² / year
    All 5 usages of RT2012 primary energy = 68.61kWep / m² / year
    Total specific consumption (household) = 13.23 kWef / m² / year
    Total specific consumption (household) = 34.14 kWep / m² / year

    Heating energy consumption is higher than expected in the thermal study. This is essentially because rooms temperature is above 19 ° C and the inhabitants were seeking for comfort closer to 21-22 ° C. However, the specific consumption is well below the forecast which makes this home a truly positive energy housing considering all consumption: those of the house and those of occupants.

Envelope performance

  • 0,28 W.m-2.K-1
  • - Exterior walls: wall masonry type A 20 cm Calibric Terreal + stucco + 11.3 cm of insulation -> U = 0.214 W / m².K
    - Interior walls: Partition placbric Terreal + coating + 9.3 cm of insulation -> U = 0.309 W / m².K
    - Floors: concrete screed + isochape + compression slab + insulation -> U = 0.130 W / m².K
    - Ceiling height lost: plasterboard 36cm + wool blown -> U = 0.154 W / m².K

  • 0,60
  • n50

  • 0,36

Real final energy consumption

    56,39

    56,39

    2 014

Systems

    • Electric heater
    • Wood boiler
    • Heat pump
    • No cooling system
    • Humidity sensitive Air Handling Unit (Hygro B
    • Solar photovoltaic
    • Wood boiler
  • 158,40 %
  • Total PV production in 2014 = 108.69 kWhep / m² / year which compensates for kWhep 68.6 / m² / year consumed by the building +the 34.14 kWhep/ m² / year for specific uses of the inoccupants

Smart Building

    no BMS

GHG emissions

  • 1,00 KgCO2/m2/an

Product

    Calibric TH evolution TERREAL

    TERREAL

    isabelle.dorgeret@terreal.com

    Gros œuvre / Structure, maçonnerie, façade

    New generation heat-resistant brick R = 1.15 Brick m²K / W. A highest quality of construction thanks to glued-down installation, adapted also to collective works. Perfect compatibility with the range of monoliths accessories of TERREAL for special point’s treatment.

    Regulation and certifications: Calibric® Th evolution under DTA CSTB No. 16 / 09-586 of 17/05/2010 (under revision) and Certificate No. 409-238-586 12/04/2012. It meets the requirements of NF EN 771-1 / CN " "Specifications for masonry units - Part 1: Clay brick buildings"; CE Products * NF in NF and NF S * Th * *

    The certified characteristics for the NF Brick Terracotta is the appearance (for horizontal perforated bricks only), dimensions, dry bulk density, bursting, the expansion due to moisture, compressive resistance, resistance to hard impacts, resistance to scuffing, durability (frost resistance). The NF Thermal also certifies the thermal characteristic of the model.

    The thermal resistance of the wall combining certified model is validated on the basis of a calculation. The NF Seismic also certifies the use for buildings subject to seismic requirements.

    See the video shot with the building firm on the site dedicated to the project http://www.habitatsocialpositif.com/construire-hsp/en-images/videos/


    LAHEROOF System - ECS Thermodynamics calories coupled with a collector placed under the tiles

    TERREAL

    isabelle.dorgeret@terreal.com

    Génie climatique, électricité / Chauffage, eau chaude

    Sloping roofs are traditionally ventilated on the underside of hedging products. Passing under the terracotta tiles, the air warms. This innovation can recover the energy of this air space. The heat recovered is used to heat the incoming air in a heat pump water heater which makes possible to improve the performance.

    The system is placed between the tiles and the roof underlay screen in the thickness of the roof, it is connected by a tube to the heat pump of water heater. The complete system enables to lower the power consumption of the heat pump of water heater.

    -20% reduction of electricity consumption in the hot water system for sanitary use. Due to its global approach of homes energy performance, this system improves the overall technical-economic ratio of individual houses according to current regulations.

    The thermal system is installed at the same of the laying tiles or a posteriori by lifting a few tiles. The system was adopted easily by the stakeholders of the project. Laheroof performance is valuated in the regulatory thermal calculation holding an "arrêté titre V"http://www.construction21.org/france/community/pg/file/846/read/19355/titre-v-prise-en-compte-du-systme-laheroof-_-arrt-du-13octobre2014


    Mud wall

    TERREAL

    isabelle.dorgeret@terreal.com

    Second œuvre / Cloisons, isolation

    The dividing wall between the living room and bedrooms is mud brick, which helps to regulate the relative humidity of the pieces by increasing the feeling of comfort and significantly improve summer comfort.

    The partition is mounted like any clay or plaster wall tile, it must nevertheless take particular care in choosing the coating and its application to allow the wall develop their hygrothermal properties.

Construction and exploitation costs

  • 85 000,00
  • 11 800,00
  • 104 949

Urban environment

The HSP operation counts two houses, a 3-romm and a 4-romm, which consume less energy than they produce. They are built in eco-district Vallons des Griffoul in Castelnaudary with locally manufactured sustainable building materials. This case study covers the 3-room house. The ZAC "Vallons des Griffoul" won the “New Sustainable Urban Forms" prize awarded by the Languedoc Roussillon region in 2010.

Designed on the model of an eco-district, it offers new forms of housing in a sustainable and innovative neighbourhood; it is adapted to the needs of the population in all its diversity, respect the local identity and environmental requirements.

As part of its sustainable development policy, the city of Castelnaudary developed a project limiting the impact on the environment, ensuring an adequate energy management and with particular attention to the environmental quality of the ZAC. Designed as an eco-district, combining efficiency of consumption, technical and energy requirements, densification and diversity prioritizing the relation to nature, to agricultural land and water.

The eco-district completes the existing urban fabric, in line with the sustainable development objectives of the municipality:
- Form and urban integration: limitation of heights, reduced car use, presence of bike paths, pedestrian paths, proximity of public transport.
- Mixity: The units will be individual, grouped and collective individual and a quarter of them will be in social housing.
- Water: rainwater recovery, consumption control equipment, welcomes booklets for future occupants.
- Biodiversity conservation of woodlands.
- Orientation bioclimatic: living rooms oriented to south.
- Energy: low consumption building and solar thermal hot water.
- Waste: pre-sorting and composting spaces.
- Materials: local, natural, certified.
- Controlled costs.
- Consultation.

Land plot area

500,00 m2

Built-up area

50,00 %

Parking spaces

A garage

Building Environmental Quality

  • waste management (related to activity)
  • products and materials
The houses of the Positive Energy Social Housing project prove the reality of positive energy.
After 18 months of occupancy, all consumptions are optimised: the 5 usages of the French thermal regulation and the consumptions specific to th the tenants. Theses consumptions are entirely compensated by renewable energies. That's why this house competes in the Net Zero Energy Building category.

Contest categories

Bâtiment zéro énergie

Bâtiment zéro énergie

Green Building Solutions Awards 2015


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