September 8, 2021

Grab Headquarters (by Ascendas REIT)

Designed to provide a green and sustainable workplace environment, Grab Headquarters is a Built-to-Suit business park property comprising two tower blocks, with a total GFA of 42,310 sqm. It incorporates lush greenery on the ground and mid-level sky terraces that is integrated with communal spaces and public pedestrian thoroughfares. The use of recycled building materials and low emissive glass facade helps to reduce solar heat gain to the building’s interior. The building has won a Green Mark Gold Plus Award under the New Non-Residential Building category, at BCA Awards 2020.

New Built-to-Suit Development

The building has been well designed to fit its purpose, meaning there is not “over designing” which will lead to wastage of resources, as in most new construction. With an Envelope Thermal Transfer Value (ETTV) of 33.54 W/sqm, which is in fact better than the standards set for Super Low Energy (SLE) building, means that the build is able to keep out heat gain from the surrounding environment, and thus reducing the energy consumption required to operate the air-conditioning system. Various new technologies have also been incorporated to cut down on energy usage.

  • Total installed cooling capacity of 1650RT, with Chilled Water Plant efficiency at 0.6 ikW/RT, which is 7.7% better than Green Mark Gold Plus standard.
  • Combined airside efficiency of 0.23 ikW/RT.
  • Use of high efficiency equipment such as VSD Maglev Chillers, pumps and cooling towers coupled with energy efficient Variable Speed Drives (VSDs).
  • Design ETTV of 33.54 W/sqm using low heat emissive materials for façade.
  • Use of energy efficient LED lighting at all areas.
  • Carbon monoxide sensors used to regulate the carpark mechanical ventilation system.
  • Energy sub-metering and monitoring, with a permanent M&V system.

Innovative Technologies to Increase Airside Efficiency

With the use of EC fans in Air Handling Units, the airside efficiency is able to achieve on of the best-in-class for office buildings. Moreover, making use of thermal diffusers for the air distribution allows for autonomous adjustment of airflow into the air-conditioned space, and cut down installation of Variable Air Volume (VAV) boxes. Spaces will be cooled with cold air based on demand, and mechanical faults of conventional VAV boxes can be greatly reduced, thus increasing maintainability.

Advanced Chilled Water Valve System

The building also uses Energy Valves for its chilled water distribution system into the air handling units (AHU). These valves modulate the flowrate of chilled water required while maintaining a pre-set temperature difference. As a result, the amount of energy required by the chilled water pumps can be optimized, reducing the energy used and yet not compromising on the occupants’ comfort level.

LED Lighting System

With a 100% use of LED lighting, the lighting power budget has also been greatly reduced from the baseline set out by Singapore Standard SS530 (or previously called Code of Practice). As a result, lower energy will be consumed to provide the same amount of lighting for indoor spaces. This in turns also reduces the need for cooling air to remove the heat generated by the lighting system.

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