Zouk Mosbeh, Lebanon

College Notre Dame de Louaize

NDL School is situated in Zouk Mosbeh, Lebanon, which dates back to 1960. The school aims to renovate the existing building with reduction in energy consumption as the goal. The school aims to replace the building's aluminum windows and the lighting system. In addition, a new HVAC system and roof insulation will be installed as well.


Old single-glazed windows are affecting the operation of the heating system and the indoor conditions, so they will be replaced by double-glazed system. The old lighting system will be replaced with modern fluorescent lamps. An efficient sandwich panel will be integrated in the roof structure for more energy savings and new efficient DX inverter systems will be installed in the new labs and classrooms.

Project info

Construction phase
Building type
Non-residential building
Detailed building type
Net floor area
40000 m2
4 stories
Construction type
Original construction year of the building
Project contact
Pere Charbel Haddad
Contact email address

Project team

Energy efficiency consultant(s)
Apave Liban
HVAC consultant(s)
Apave Liban

Building Rating and Certifications systems

Rating and certifications systems
Not applicable

Building Envelope

External walls

Description of construction
Double Wall (15cm - 3 cm gap - 10 cm) with cladding
1.21 W/(m²*K)


Roof type
Double Pitch Roof
Description of construction
Brick 5 cm - Sandwich panel 5 cm. The additional insulation to the roof structure has reduced the cooling load to 56.65 kW and resulted in a total savings of 4.2% of the total electricity bill.
0.37 W/(m²*K)

Openings and windows

Glazing type
Double glazed
Frame material / description
Overall u-value window
2.78 W/(m²*K)
Description of construction
The previous thermal load was estimated around 369.74 kW, but with the new double glazed installations, a reduction of 130 kW is achieved. The new windows are double glazed with an aluminum frame, resulting in a U-value of 2.78 W/m2 compared to 5.8 W/m2 of the previous windows.

Basement floor

Description of construction
30 cm concrete
1.92 W/(m²*K)

Technical Building Systems

Space cooling system

Primary space cooling system
Mounted single-split or window air conditioner│Usually a visible smaller system mounted outside the wall or above the window just supplying one room
Inverter type AC unit with different capacities. The use of inverter AC units will save 7.06% of the total electricity bill.
Manufacturer(s) / products

Lighting system

Primary lighting system
Linear fluorescent lamps (LFL)
The old system was based on obsolete fluorescent T12 lamps with magnetic ballasts. The new system will use T18 fluorescent lamps with electronic type ballasts, which leads to energy savings and higher lumens output. The changes to the lighting system will lead to 1127 $/year savings.
Manufacturer(s) / products

Financial Aspects

Project construction cost
599256.3636 EUR
Estimated costs of energy efficiency and renewable energy measures
599256.3636 EUR
Financing sources
Financing/funding institution
IBL Bank