Case Studies
Ajena
Lons le Saunier, France
Code: CS9
Original situation
1960s concrete non-residential building on the outskirts of Lons le Saunier. The building is used by AJENA, “Association Jurassienne d’Energies reNouvelAbles", as a centre for training on retrofitting, so a well renovated building would be a big plus, making obsolete its old fuel heating system and giving more sense to renewable energy on top of the building.
Renovation approach
Monitoring post-renovation is now underway. The project's certification is now completed and will be awarded on September 23, 2023, during the building's inaugual ceremony.
Modernisation proposal
Internal Insulation on the “blind” north wall. On the south wall: mounted on site “wooden boxes” to hold insulation . Comfort ventilation with high performance heat recovery. Air tightness and reduction of thermal bridges.
Efficiency improvement
The improvement that an EnerPHit renovated building can offer is huge in this cold part of Jura near Geneva, reducing heating demand by a factor of 10.
PHPP verification sheet before retrofit
| TFA | existing treated floor area (usable floor space) |
285.0 m2 |
|---|---|---|
| Space heating | Heating demand |
342.0 kWh/(m2a) |
| Heating load |
113.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
– kWh/(m2a) |
| Cooling load |
– W/m2 |
|
| Frequency of overheating (> 25 °C) |
9.0 % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.0 % |
|
| Airtightness | Pressurization test result n50 |
1.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
154.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
641.0 kWh/(m2a) |
PHPP verification sheet after retrofit
| TFA | existing treated floor area (usable floor space) |
285.0 m2 |
|---|---|---|
| Space heating | Heating demand |
14.0 kWh/(m2a) |
| Heating load |
12.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
– kWh/(m2a) |
| Cooling load |
– W/m2 |
|
| Frequency of overheating (> 25 °C) |
11.0 % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.0 % |
|
| Airtightness | Pressurization test result n50 |
1.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
101.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
65.0 kWh/(m2a) |
Key facts
Building typology
Office | administration building
Existing treated floor area (usable floor space)
285 m2
Building owner
AJENA
Consulting outphit partner
PROPASSIF
Project status
Certified
Overall budget
550 000 €
Contact
Etienne Vekemans
CEO
PROPASSIF
Phone: 0145081335
E-Mail: e.vekemans@propassif.fr