Case Studies

Université de Lorraine

Metz, France

Code: CS38

Outside view
© ProPassif
Current building status
© ProPassif
Windows
© ProPassif
Pipe work under the building
© ProPassif
Building plan after retrofit
© ProPassif
Fire testing of prefab modules
© ProPassif

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.

Renovation approach document

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)

2730 m2

Building owner

Université de Lorraine

Consulting outphit partner

ProPassif

Project status

Planning phase

Overall budget

2000000 €

Contact

Etienne Vekemans
CEO
PROPASSIF
Phone: 0145081335
E-Mail: e.vekemans@propassif.fr