Tunis, Tunisia
HQ building of the STEG International Services
The STEG International Services built its HQ building in Les Jardins de Carthage District, Tunis in 2018. This Office Building comprises 4 floors and has in total a built-up area of 2668 m². The main measures to save energy are thermal insulation of roofs, the use of an energy-efficient lighting system, the use of low-emissivity double glazing, and the use of an energy-efficient air conditioning system. The implementation of these measures has resulted in an annual energy savings of around 140 MWh of electricity.
Project info
- Construction phase
- New construction
- Building type
- Non-residential building
- Detailed building type
- Office
- Net floor area
- 2688 m2
- Land plot size
- 1536 m2
- Stories
- 4 stories
- Construction type
- Mixed construction
- Original construction year of the building
- 2016
- Project contact
- STEG INTERNATIONAL SERVICES
- Contact email address
- stegis@steg-is.com
Project team
- Developer(s)/owner(s)
- STEG International Services
- Architect(s)
- TASMIM Architerture and Urban Planning Agency
- Energy efficiency consultant(s)
- Mr. Mohamed Sadok Bouallègue
- HVAC consultant(s)
- Mr. Abdelhamid Touil
- Other project team partners
- Electrecity consultant: SOGICE Company. Construction consultant: Building Concept Company.
Building Rating and Certifications systems
- Rating and certifications systems
- Other
- Other certification
- The building achieved the 1st rating per the Tunisian Thermal Regulation (65 kWh/m².a)
Building Envelope
External walls
- Description of construction
- The external walls are thermally insulated with these layers: exterior aluminium cladding, 5.5 cm rock wool insulation, 2.5 cm cement mortar, 20 cm 12-hole brick, 4 cm air gap, 6.5 cm 8-hole brick, and a 2 cm interior mortar coating.
- U-Value
- 0.565 W/(m²*K)
Roof
- Roof type
- Flat roof
- Description of construction
- The building's roof features: a 2.5 cm bastard mortar layer; 21 cm of 16 cm hollow-body plus 5 cm reinforced concrete; 3 cm cement mortar; a steam screen; 4 cm rock wool; polyethylene and glass veil; 4 mm waterproof membrane; and paving.
- U-Value
- 0.638 W/(m²*K)
Openings and windows
- Glazing type
- Double glazed
- U-Value glass
- 2.511 W/(m²*K)
- Frame material / description
- The frames of the bay windows are constructed from aluminium with thermal breaks, providing optimal thermal performance.
- Overall u-value window
- 2.467 W/(m²*K)
- Description of construction
- The bay windows feature aluminum frames with thermal breaks and low-e double glazing. They have 6 mm clear low-emissivity glass inside, a 12 mm argon gas layer, and 6 mm Stopray smart glass outside for optimal thermal performance.
Basement floor
- U-Value
- 2.192 W/(m²*K)
Technical Building Systems
Ventilation system
- Type of ventilation
- Free ventilation (windows)
Space cooling system
- Primary space cooling system
- VRF reversible air-air heat pump running on NG.
- Efficiency
- 1.15
- Description
- Cooling is handled by a VRF reversible air-air heat pumps running on natural gas and AHUs. The system offers high performance with a higher COP and can heat and cool multiple areas, suitable for the building’s orientation and occupancy.
- Manufacturer(s) / products
- LG / GP-W400B6C and GP-UW250B6C
Space heating system
- Primary Space heating system
- Air-conditioning system (reversible for heating; air-air heat pump)
- Description
- The building's space heating is provided by the same system, VRF reversible air-air heat pumps runing on natural gas and air handling units.
Lighting system
- Primary lighting system
- LED (Light emitting diode lamps)
- Efficiency
- 100
- Description
- The lighting system includes 43 W LED panels in offices, 12 W recessed LED spotlights in large areas and toilets, and 3 W spotlights in the parking area and terraces. Presence detectors control lighting in circulation areas and toilets.
Shading devices
- Type of shading system installed
- Static (fix) shading systems as part of the building architecture (e.g. Maschrabiyya, porch roofs, pergolas)
- Description
- Two types of shading devices have been installed to prevent direct solar irradiation on specific building façades. The first type is an aluminium "airplane wing" horizontal sunshade, which has been deployed for windows facing northwest and southwest. The second type is an aluminium "awning" horizontal sunshade, which has been installed for windows facing northeast and southeast.
Final Energy Demand
- Energy carrier (1)
- Electricity
- Energy carrier (2)
- Gas a
- Total specific final energy demand
- 85 kWh/(m²*a)
