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 as a centre for training on retrofitting, so a well renovated building would be a big plus.
Renovation approach
A prefabricated wall to the north (windowless) and on the south wall, wooden caissons (boxes) mounted onsite to support the insulation. Ventilation with high performance heat recovery. Increased airtightness throughout and reduced thermal bridging to be achieved through the use of prefab elements and exterior insulation.
Modernisation proposal
A complete energy retrofit to EnerPHit level using some prefabricated elements: a prefabricated North wall and South wall that will be mounted on-site. Triple glazing and ventilation with heat recovery will be added.
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 |
25.0 kWh/(m2a) |
| Heating load |
15.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
– kWh/(m2a) |
| Cooling load |
– W/m2 |
|
| Frequency of overheating (> 25 °C) |
8.0 % |
|
| 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 |
74.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
69.0 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
Construction phase
Overall budget
550 000 €
Contact
Etienne Vekemans
CEO
PROPASSIF
Phone: 0145081335
E-Mail: e.vekemans@propassif.fr