How to approach green construction in the tropical zone

Photo: BCA

Photo: BCA

While nearly zero energy projects in Europe focus on reducing heat demand, green buildings in tropical Singapore require lower cooling loads. To study and discuss methods to meet cooling needs, construction and energy experts from all around the world met in Singapore in late October for a two-day workshop organised by the Building & Construction Authority Singapore (BCA) and the IEA’s Buildings and Communities Programme (EBC).

The FBF Think Tank Workshop 2017 brought together around 60 invited experts from seven of the IEA’s Technology Collaboration Programmes (TCP), for example, Solar Heating and Cooling (SHC), District Heating and Cooling (DHC), and Photovoltaic Power Systems (PVPS). Findings will be available in the first quarter of 2018. “During the workshop, we concentrated on the issue of efficient and renewable space cooling in hot and humid climates, and this will also be the focus of the results report,” said Andreas Eckmanns, Chair of the IEA EBC programme. Previous Think Tank Meeting reports from 1990, 1995, 2001, 2007 and 2013 are available for download.

Important input came from the BCA, an agency managed by Singapore’s Ministry of National Development. Dr Gao Chun Ping, Director of the Green Building Research Department at the BCA´s Built Environment Research and Innovation Institute, presented milestones in green building from across the city (see photo above). Since the launch of the BCA Green Mark scheme in 2005, Singapore has experienced exponential growth in green building construction. The number of structures went from 17 in 2005 to more than 3,100 in 2017, which translates into about 92 million m² of gross floor area, 34 % of the total around the country. The Green Building Movement said that 80 % of the building stock would be ‘green’ by 2030.

Singapore’s energy standards on non-residential buildings (Source: BCA)

2005’s average baseline consumption in commercial buildings was 244 kWh/m²a, of which more than half was used for air-conditioning and ventilation (see the figure above). The current Green Mark scheme has lowered specific energy demand to 160 kWh/m²a, but the BCA has been setting up pilot projects that show even greater efficiency. One example is the BCA Academy’s Zero Energy Building, whose annual energy demand of 83 kWh/m² will be met by an on-site solar photovoltaic system. Since there is limited roof space on high-rise buildings, district cooling solutions are becoming ever more important. For new developments, construction companies have begun to look for ways to connect newbuilds to district cooling systems.

Building owners who want their buildings to be certified according to the BCA’s Green Mark can receive up to 140 points based on 5 sections, 16 criteria and 52 sustainability indicators: 

  • Climatic Responsive Design (Leadership, Urban Harmony, Tropicality)
  • Building Energy Performance (Energy Efficiency, Energy Effectiveness, Renewable Energy)
  • Resource Stewardship (Water, Materials, Waste)
  • Smart and Healthy Building (Indoor Air Quality, Spatial Quality, Smart Building Operations)
  • Advanced Green Efforts (Enhanced Performance, Demonstrating Cost Effective Design, Complementary Certifications, Social Benefits)

Today, the BCA Green Mark is also used for supermarkets, restaurants, healthcare facilities and supporting infrastructures, data centres, rapid transit systems, and even parks.

The 2,600 m² collector field which is currently being set up on the roof of Swedish furniture company IKEA shows that solar thermal cooling can play a lead role in meeting the BCA’s ambitious green building targets in Singapore. The solar heat will be used to run an 875 kW (250-tonne) absorption cooling machine and the system is said to start operating by the end of 2017.

Bärbel Epp (

Similar Entries

Excelsior Energy Capital (“Excelsior”), a renewable energy infrastructure fund focused on long-term investments in wind and solar power plants in North America, and Unico Solar Investors (“Unico Solar”), a wholly owned subsidiary of Unico Investment Group LLC that develops, owns and operates commercial and community solar installations, announced the completion of a 300-kilowatt solar energy system at Central Station, a new four-story, 125,000-square-foot office building. Developed by SteelWave and owned by Principal Real Estate Investors, the building is located at 285 Sobrante Way in Sunnyvale, California.

Under the motto "Think Ahead", the meteocontrol team will be presenting innovative solutions for the energy transition at Intersolar Europe at its booth B3.574. pict.: meteocontrol GmbH

Under the motto "Think Ahead", meteocontrol GmbH will be demonstrating at its booth B3.574 at Intersolar Europe how more efficient operational management can save time, increase yields and thus drive forward the energy transition.

Solarpark Kabai: MET Group and IBC Solar Energy started their successful cooperation in 2020. The result was a large-scale PV project with an output of 43 MWp (pict.: IBC Solar Energy)

IBC Solar Energy, the international project division of IBC Solar AG, has signed contracts for the realization of two megawatt solar parks in Hungary with a nominal capacity of 51 megawatt peak (MWp) and 45 MWp.

The experience of the TÜV SÜD experts has shown that even in the case of different WEC types, wind farms can often be assessed as a total complex (pict. TÜV SÜD)

Twenty years does not have to mean the end. Many wind-energy converters (WECs) can continue to feed power into the grid far beyond their original service life. TÜV SÜD experts know what is important in the Assessment and Verification of the Lifetime Extension of Onshore Wind Energy Converters (LTE) and how to leverage opportunities.