Positive Social Housing - 4-room house

by isabelle Dorgeret
/
2015-03-20 16:07:42
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France
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16503 / FR

New Construction

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 : 101 m²
Construction/refurbishment cost : 134 755 €
Cost/m2 : 1334.21 €/m²

Certifications :

Primary energy need :
35.6 kWhep/m².an
(Calculation method : RT 2012 )

Energy consumption

Economical buildingBuilding

< 50A

51 à 90B

91 à 150C

151 à 230D

231 à 330E

331 à 450F

> 450G

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, the students and the teachers of the building trades Andreossy Highschool of Castelnaudary and the TERREAL company, a constructive solutions manufacturer for the building envelope and leading economic player of the region.

The project is the brainchild of four partners:

Imagine an exemplary territorial project around the Eco district Vallons de Griffoul by building 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. Selected materials and systems are simple to operate and robust. 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 done in accordance with the principles of bioclimatic architecture and with particular focus on the summer comfort of the future resident.
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 aid for students in high school who imagined the technical solutions for shaders.

The Positive Social Housing project is also the practical support for research conducted in 2015 by a PhD student at the University of CERTOP Toulouse. The research aimed to understanding the influence of occupant behavior on the performance of homes, 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 4-room house.

See more details about this project

http://www.habitatsocialpositif.com

Data reliability

3rd part certified

Stakeholders

Manufacturer

Investor

Environmental consultancy

Others

Designer

Thermal consultancy agency

Certification company

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, and 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

Primary energy need : 36 kWhep/m².an
Primary energy need for standard building : 60 kWhep/m².an

RT 2012

CEEB : 0.0002

Final Energy : 56 kWhef/m².an

Breakdown for energy consumption :

Actual energy consumption 2014:
- Heating kWhfe = 19.8 / m² / year
- ECS: 2.9 kWhfe / m² / year
- Lighting + auxiliary ventilation: 2.3 kWhfe / m² / year
- Total RT2012: kWhfe 25 / m² / year
- specific consumption: 30.74 kWhfe / m² / year

More information :

Actual consumption :
- Heating: kWhfe 37.86 / m² / year
- ECS: 3.17 kWhfe / m² / year
- Lighting + auxiliary ventilation: 1.78 kWhfe / m² / year
- Total RT2012: kWhfe 42.41 / m² / year
- specific consumption: 29.02 kWhfe / m² / year

Envelope performance

Envelope U-Value : 0 W.m^-2.K^-1

More information :

- External walls: Brick BMI isolated monolith Terreal + coating + ext plasterboard U = 0.268 W / m².K
- Internal walls: placbric partitions Terreal + int + coated insulation: U = 0.309 W / m².K
- Floor Screed insulation + compression slab + isoleader 23: U = 0.130 W / m².K
- Ceiling height lost: plasterboard + 36 cm of blown wool U = 0.154 W / m².K

Building Compactness Coefficient : 1

n50

Air Tightness Value : 0

Real final energy consumption

2 014

Systems

Heating system :

Electric heater
Wood boiler

Hot water system :

Solar Thermal

Cooling system :

No cooling system

Ventilation system :

Humidity sensitive Air Handling Unit (Hygro B

Renewable systems :

Solar photovoltaic

Renewable energy production : 340 %

GHG emissions

GHG in use : 1 KgCO₂/m²/an

Product

Structural work / Structure - Masonry - Facade

System of isolated monolithic bricks the height of one storey (30 cm insulated). The façade is asymmetrical so as to concentrate most of his side mass inside the house, thus giving a better inertia therefore a better summer comfort. The system also allows an excellent result to the air impermeability test.

View the videos shot during the construction with the interview of the building company which explains how the product is arises and what are its benefits : http://www.habitatsocialpositif.com/construire-hsp/en-images/videos/

HVAC, électricité / heating, hot water

Solar thermal hot water, usable in low sloping roof integration, it remains tight in slopes of 20%

Very well accepted by the roofing company, Terreal's integration kit was developed with traditional hedging techniques and a companion of duty.

Construction and exploitation costs

Total cost of the building : 134 750 €

Urban environment

The house is located in the eco-district of Vallons du Griffoul in Castelnaudary. The eco-district completes the existing urban fabric, in line with the sustainable development objectives of the municipality:
- Urban form and integration: limitation of heights, reduced car use, presence of bike paths, pedestrian paths, the proximity of public transport.
- Gender equality: homes will be individual, individual grouped and collective. A quarter of them will be in social housing.
- Water: recovery of rainwater, consumption control equipment, welcome booklets for future occupants.
- Biodiversity : conservation of woodlands.
- Bioclimatic orientation : living rooms south.
- Energy: low consumption buildings and solar thermal hot water.
- Waste: sorting and composting areas.
- Materials: local, natural, certified.
- Reasonable costs.
- Concertation.

Land plot area

500 m²

Parking spaces

A garage attached to the house

Les maisons HSP font la preuve de la réalité de l’énergie positive.

Après 18 mois d’habitation, toutes les consommations sont optimisées : celles des 5 usages de la règlementation et les consommations spécifiques des locataires et elles sont compensées en totalité par des énergies renouvelables. C’est pourquoi cette maison concourt dans la catégorie « Bâtiment zéro énergie »