Beirut , Lebanon
LOS Office Building
The project achieved the LEED Gold certification in 2019. Some climate-friendly features of the building include external vertical shading, PV panels, efficient double-glazing, a high-efficiency VRF system and solar water heaters. A full 3D energy model was conducted to estimate the energy costs reduction compared to an ASHRAE-prescribed baseline scenario resulting in 13.1% energy improvement. LOS has one fully glazed curtain wall on the Eastern façade with efficient double glazing. External vertical shading elements on the western façade with a reduced window-to-wall ratio also help reduce the solar gains. The roof is insulated with 5 cm extruded polystyrene and shaded by photovoltaic panels. A high efficiency VRF system is used for space cooling and heating. solar water heaters are used for domestic hot water and PV panels are also installed.
Project info
- Construction phase
- New construction
- Building type
- Non-residential building
- Detailed building type
- Office
- Net floor area
- 1701 m2
- Land plot size
- 586 m2
- Stories
- 4 stories
- Construction type
- Concrete
- Original construction year of the building
- 2019
- Project contact
- Imad Ladkani
- Contact email address
- i.ladkani@losgroup.net
Project team
- Developer(s)/owner(s)
- Imad Ladkani
- Architect(s)
- Avedissian & Partners Architects
- Energy efficiency consultant(s)
- EcoConsulting
- HVAC consultant(s)
- Ibrahim Mounayar
- Building services
- Ibrahim Mounayar
Building Rating and Certifications systems
- Rating and certifications systems
- LEED
Building Envelope
External walls
- Description of construction
- 30cm concrete wall incl. thermal insulation
- U-Value
- 0.26 W/(m²*K)
Roof
- Roof type
- Flat roof
- Description of construction
- Concrete slab with 5cm extruded polystyrene insulation
- U-Value
- 0.52 W/(m²*K)
Openings and windows
- Glazing type
- Double glazed
- U-Value glass
- 3.3 W/(m²*K)
- G-Value glass
- 0.54
- Frame material / description
- Aluminum frame
- Overall u-value window
- 2.79 W/(m²*K)
- Description of construction
- Low E double glazing 5, 5, 5
Basement floor
- Description of construction
- Concrete slab
Technical Building Systems
Ventilation system
- Type of ventilation
- Mechanical ventilation system without heat recovery
Space cooling system
- Primary space cooling system
- Centralised chiller │Usually a central system located in the basement
- Description
- VRV System
- Secondary 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
- Description
- DX System for the server room
Space heating system
- Primary Space heating system
- Air-conditioning system (reversible for heating; air-air heat pump)
- Description
- VRV System
Water heater system
- Primary water heater system
- Solar Thermal collector on the roof
Lighting system
- Primary lighting system
- LED (Light emitting diode lamps)
- Efficiency
- 100
Shading devices
- Type of shading system installed
- Static (fix) shading systems as part of the building architecture (e.g. Maschrabiyya, porch roofs, pergolas)
- Description
- Vertical shades are installed on western facade between windows. They are perpendicular to the façade and protrude 35 cm.
Photovoltaics
- Capacity
- 11.52 kWp
- Description
- Installed on the roof
Final Energy Demand
- Energy carrier (1)
- Electricity
- Annual heating demand
- 10 kWh/(m²*a)
- Annual cooling demand
- 15.65 kWh/(m²*a)
- Annual lighting demand
- 14.76 kWh/(m²*a)
- Annual hot water demand
- 4.85 kWh/(m²*a)
- Total specific final energy demand
- 78.88 kWh/(m²*a)
Financial Aspects
- Project construction cost
- 1700000 EUR
- Certification costs
- 3555 EUR
- Financing sources
- Own + subsidised loan
- Financing/funding institution
- NEEREA
