1 2 3 Reno is a support tool for renovating existing individual and collective housing.
The tool has been developed by a team of professionals who are all contractors in construction, maintainence and building renovation.
Urban planning design firm:
Architecture, town planning email@example.com
HABITAT ET SOCIETE firstname.lastname@example.org
developing the tool and its functions
The approach firstly consisted of characterising housing stock in Mediterranean and Alpine regions built up the 2000’s. 14 categories were subsequently defined; 8 categories of individual housing and 6 categories of collective housing.
Secondly, 14 buildings belonging to each of these categories were visited. These buildings formed the basis of the study.
Energy consumption calculations were conducted for each building (see paragraph on calculation method) and recommendations for improvements were tested. These recommendations, when combined, constitute the building work packages.
In parallel, a (non-exhaustive) list of renovation work was produced. This work is grouped into 8 themes. They represent the initial household “project” and form the gateway to the energy-efficiency renovation project. Some of this work can have an effect on the type of energy-efficiency renovation work.
The aim of the final tool is therefore to propose energy-efficiency building work packages linked to the renovation project in relation to the type of housing.
Documents provided by the tool
The modifiable documents provided by this tool are:
-a typology form: providing a description of each category of housing, when it was built, the composition of the walls, its architectural and technical characteristics, etc.
- an advice form: providing guidance on the capacity for development of this type of housing, the lifestyle and culture of the building as well as architectural and technical recommendations.
- a building works form: a summary sheet providing a recap of the initial situation, the features comprising the work package selected, its performances as well as further information to begin renovation work.
PROCESS leading to PRODUCTION OF THE BUILDING WORKS FORM
The user begins by selecting the renovation project corresponding to their situation.
Once the project has been selected, the user chooses the corresponding housing category. The typology and advice forms, which can be modified at this stage, provide additional information.
The “Building works packages” page gives the user the option of generating a package of building work using the “package generator”.
The geographic zone in which the project is located (Department) must be indicated as the energy consumption figure stated on the building works form is dependent on this.
The package generator
The 1 2 3 Reno generator is configured to the housing categories and the range of solutions proposed is based on this.
In the case where the initial project has an impact on energy-efficiency renovation work, certain types of building work will not be proposed. For example, repainting internal surfaces will be referred to energy-efficiency renovation projects in which the walls are insulated internally (the external insulation option being rejected).
Certain inputs to the project such as “reducing energy bills” or “improving internal air quality” give access to all the building work packages.
No building work item takes precedence over another in the simulator. The first entry can be “joinery” or even “heating equipment”. This enables the user to enter work that has already been undertaken on their housing so that they can see the remaining work required to meet Factor 4 performance levels. This function also makes it possible to firstly enter the “limiting” parameter for the project, e.g. heating energy and/or domestic hot water production available on the site.
Sometimes, only one technical solution might be proposed in a single building work package. If this is selected, no other building work items can be added and the package appears straight away.
As concerns the summer comfort measure, building work items cannot be selected individually. They must all be undertaken in accordance with the existing situation.
Once the building works package has been selected, the building works form containing all the information can be modified.
Different calculating methods were used for the following purposes:
checking the consistency of the building work packages proposed
definition of target values to reduce energy consumption for each method
The TH-C-E-ex MEthod
Software programme used: BBS Slama CLIMAWIN Version 4.19.1
Method: TH-C-E-ex in accordance with Decree of 13 June 2008 – existing overall TR
Purpose in the protocol: checking that the BBC-effinergie Rénovation® level has been reached
Most renovation projects on existing buildings are now subject to “thermal regulations for existing buildings element by element” (Decree of 3 May 2007). Thermal calculations are not mandatory for this regulation.
In order to measure the energy performance of renovation projects, it was therefore decided to use the “overall thermal regulations for existing buildings” which applies to major renovation projects.
This regulation is enforced and requires regulatory calculations to be made for energy-efficiency renovation projects on buildings with a surface area greater than 1,000 m² built after 1948, when the cost of building work exceeds 25% of the value of the building concerned.
Primary energy consumption (Cep) is expressed in kWhEP/m² net floor area/year and takes into account the following types of energy consumption:
The primary energy conversion coefficients are by convention equal to 2.58 for electricity, 0.6 for wood and 1 for other forms of consumption.
This calculation also assesses the conventional internal temperature (CIT) linked to summer comfort.
To obtain the BBC-effinergie Rénovation® certification, energy consumption must be less than the formula:
Cep < 80 x (a+b) kWhep/m²/yr
Coefficient “a” ranges between 0.8 and 1.3 based on the climate zone while the coefficient “b” is between 0 and 0.2 according to the altitude of the project.
THE 3CL Method used in the energy performance certificate
Software programme used: Perrenoud DPEV4 Version 4.0.8
Method: 3CL (conventional calculation of consumption in homes)
Purpose in the protocol: for checking the level B energy label has been reached
The 3CL method, which is used in energy performance certificate scheme (EPC), is a simplified regulatory calculation method designed to assess a house or apartment building’s thermal and energy performance.
Primary energy consumption is expressed in kWhEP/m² net floor area/year and takes into account the following types of consumption:
domestic hot water
The primary energy conversion coefficients are by convention taken to be equal to 2.58 for electricity and 1 for other forms of energy consumption.
The EPC enables energy consumption-related greenhouse gas emissions to be calculated. These are expressed in kgequivCO2/m²/year.
Hypotheses and adaptations
The buildings entered into the system correspond to the categories visited including the removal of those with initial energy-efficiency renovation work (replacement of windows, loft insulation, etc.). This was done to establish a common basis for 14 building types as a starting-point for an energy-efficiency renovation process.
The energy consumption results indicated in the “building work forms” are as follows:
Building work forms for individual houses: result from the EPC calculation
The weather files used to calculate TH-C-E-ex are those applying to the RT2012 thermal regulation.
Corresponding climate zone
Site entered into the software programme
Corresponding to the site
04 / 84
06 / 13 / 83
To calculate EPC, the weather files correspond to those used in the EPC method.
Corresponding climate zone
04 / 84
06 / 13 / 83
Taking account of wood and including thermodynamic water heaters
The following hypotheses have been used to harmonise the EPC and TH-C-E-ex calculations:
application of the primary energy conversion coefficient for wood (0.6) to calculate EPC
as the thermodynamic water heater (TDWH) does not figure in the regulatory calculation motor, energy consumption for hot water has been divided by 2 to include a global COP of 2 to calculate the TH-C-E-ex, (2 is the arbitrary value given based on bibliographic research of this technology and initial feedback).
OTHER CALCULATING AND ANALYSIS METHODS
DYNAMIC THERMAL Simulations (DTS)
Software programme used: Izuba Energies Pléiades+COMFIE Version 220.127.116.11
Use in the protocol: checking summer comfort is maintained or improved with building works packages.
This dynamic thermal calculating method measures the effect of the architectural and technical solutions employed in terms of heating requirements and the way the building behaves during the summer.
Calculations are made on hourly time intervals.
Changes in summer comfort (maximum temperature reached, percentage of discomfort, etc.) will vary with the following parameters:
protection against sunlight (shade)
the action of inertia depending on the climate zone
use of night-time ventilation
keeping internal heat gains under control
SIMPLIFIED METHOD USING UDD AND HEAT LOSSES
Purpose in the protocol: this method makes it possible to quickly visualise the order of magnitude of the building’s heating and domestic hot water consumption.
Heat losses: heat losses through conduction and by renewing air, calculated using the Pléiades software programme
UDD: recording UDD from the nearest weather station, the period of data collection being based on the dates figuring in available energy bills
Delta T: difference between the preset temperature and the baseline external temperature (Base.exT - site dependent)
Intermittence, solar gains: values belonging to the buildings visited
The output of heating and domestic hot water systems: use of outputs defined by the Decree of 15 September 2006 concerning applicable methods and procedures for EPC
DHW volume: annual consumption based on 35 l of hot water at 55°C per day and per person
AnalysIS OF BILLS AND SUBSCRIPTIONS
Collection and analysis of energy bills from buildings visited
Number of years analysed: based on on-site availability
Use in the protocol: to compare actual consumption and bills with theoretical consumption
On the basis of site visits, we see:
a lack of these bills (the occupant no longer knows where they put them)
an orderly (or disorganised) record of bills in hard copy
a trend for paper-free bills (bills received by e-mail)
Energy supplier subscriptions and statement/billing methods differ from household to household.
The annual statement with monthly payments is the least useable way of analysing bills.
Ad-hoc deliveries of wood, heating oil or propane gas are also difficult to exploit because there is no way of knowing the exact seasonal consumption dedicated to heating and domestic hot water.
In some cases, there is a higher rate of power supply than that actually needed for the household lifestyle and requirements.
ComparING DIFFERENT CALCULATING METHODS
It is observed that theoretical consumptions calculated using different calculating methods differ from actual consumption figures. This is already a known fact. As a reminder, theoretical regulatory calculations are used to assess the energy performance of buildings, to establish rules for construction and to make comparisons between different buildings, but they are not intended to estimate actual consumption between buildings. Too many uncontrollable parameters come into play (preset temperature inside each building, available solar heat gains, actual weather conditions, actual energy performance of each piece of equipment, etc.).
Using the cases studied, a number of similarities can be identified between the different calculating methods and actual consumption figures, but none of these methods completely mirrors the reality.
Overall, the results differ, but when the building work packages are applied, we see that reductions in consumption are of the same order of magnitude.
1 2 3 REno BUILDING WORK PACKAGE CONSUMPTION TARGETS
The 1 2 3 Reno tool has been developed as part of the national target to reduce greenhouse gas emissions and energy consumption by a factor of 4 by 2050.
As a result, the building work packages aim to reach this goal.
In order to use the existing French thermal regulation benchmarks, the “Factor 4” performance is equated as being equivalent to the following results:
EPC Label B using the 3CL method for individual houses and apartment buildings
BBC-effinergie Rénovation®levelusing the TH-C-E-ex method for apartment buildings
The reduction in consumption indicated as a percentage on the building work form is based on the EPC calculation in climate zone H3 (French Departments 06, 13 and 83). This percentage reduction is often similar to that for other Departments and also close to the TH-C-E-ex calculation method.
BUILDING WORK PACKAGE FIGURES
The costs of work proposed in the “building work sheets” are estimates.
They are based on various projects undertaken by the software programme design team.
Basic principles for costings:
costs concern energy-efficiency renovation work and summer comfort improvements. Project management costs as well as technical control procedures and support are not included.
costs are in Euros excl. VAT per square metre of habitable floor area (€ exc. VAT / m² HFA)
costs take into account the concept of differences in scale between building work on an individual house and an apartment building.
costing the building work package takes account of the initial situation
for example, if the initial situation concerns an old gas-fired central heating system with radiators, the cost of the “gas condensing boiler central heating” package will only cover replacing the heat production system, i.e. the gas condensing boiler. Internal fittings (radiators) will be retained and therefore not costed.
Technical clarifications for certain types of work:
all the building work packages in which the heating system is renovated include the installation of a regulator with a programmer and thermostatic valves.
the replacement of external shutters is not costed in the renovation work except when installing external wall insulation. This task requires significant work on the shutters (moving the hinges and adjusting for the window frames, etc.) and sometimes entails replacement shutters.
The following partners were consulted during the development of this tool:
Agence Nationale pour l’Amélioration de l’Habitat
Association Bâtiments Durables Méditerranéens
Association Envirobat Méditerranée
Association GERES – Group for the Environment, Renewable Energy and Solidarity
CAPEB - Confédération de l'Artisanat et des Petites Entreprises du Bâtiment
CERC PACA – Cellule Economique Régionale de la Construction
Chambre Régionale des Métiers et de l’Artisanat Provence Alpes Côte d’Azur
Communauté du Pays d’Aix
DREAL PACA - Direction Régionale de l’Environnement, de l’Aménagement et du Logement
Espaces Info Energie ou Points Rénovation Info Services
Fédération Régionale du Bâtiment
Territoires partenaires « Agir et Rénover + » : Ville de Fréjus et Pays dignois
Région Languedoc Roussillon
Région Provence Alpes Côte d’Azur
The project production team wishes to thank the owners and occupiers of the 14 buildings visited and studied as well as all persons and organisations having participated and given their opinions in the study and the creation of the tool.