Beirut , Lebanon

LOS Office Building

The project involves the construction of the new office building of Ladkani Office Solutions (LOS), a company delivering hardware and software solutions. 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.

Description

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 used as a pergola to shade part of the roof terrace to reduce environmental and economic impacts associated with fossil fuel energy use.

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
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
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
U-Value
0.22 W/(m²*K)

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)

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 final energy demand
78.88 kWh/(m²*a)

Financial Aspects

Project construction cost
1700000 EUR
Certification costs
3555 EUR
Financing sources
Own + subsidized loan
Financing/funding institution
NEEREA