Case Studies
Université de Lorraine
Metz, France
Code: CS38
Original situation
1970's non-residential concrete building on the campus in Metz. The building is used as a training centre for the activities of IUT GMP, Lorraine University. A fast, high quality renovation process is the goal of this project and would save 350 MWh fossil gas per year.
Renovation approach
External insulation with airtightness treatment on a structure with a complex shape to receive and fix an insulation. Reduction and treatment of thermal bridges in the façade by use of prefabricated elements.
Modernisation proposal
Prefabricated global retrofit to EnerPHit level thanks to a prefabricated wall system produced by the company "Hunsinger". Triple-glaze windows and a comfort ventilation system are already inserted into the wall.
Efficiency improvement
The improvement of an EnerPHit renovated building has an enormous effect in this cold part of the Jura near Geneva: it shows a plus 6x reduction on the heating demand!
PHPP verification sheet before retrofit
| TFA | existing treated floor area (usable floor space) |
2730.0 m2 |
|---|---|---|
| Space heating | Heating demand |
128.3 kWh/(m2a) |
| Heating load |
55.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
– kWh/(m2a) |
| Cooling load |
– W/m2 |
|
| Frequency of overheating (> 25 °C) |
2.0 % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.0 % |
|
| Airtightness | Pressurization test result n50 |
3.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
144.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
319.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
– kWh/(m2a) |
|
| EnerPHit classic |
no |
PHPP verification sheet after retrofit
| TFA | existing treated floor area (usable floor space) |
2730.0 m2 |
|---|---|---|
| Space heating | Heating demand |
23.5 kWh/(m2a) |
| Heating load |
13.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
– kWh/(m2a) |
| Cooling load |
– W/m2 |
|
| Frequency of overheating (> 25 °C) |
1.0 % |
|
| 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 |
62.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
70.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
– kWh/(m2a) |
|
| EnerPHit classic |
no |
Key facts
Building typology
School | campus | university
Existing treated floor area (usable floor space)
2 730 m2
Building owner
Université de Lorraine
Consulting outphit partner
ProPassif
Project status
Planning phase
Overall budget
2 000 000 €
Contact
Etienne Vekemans
CEO
PROPASSIF
Phone: 0145081335
E-Mail: e.vekemans@propassif.fr