DELTA GREEN LIFE
International “Net Zero” system makes building more eco-friendly
DEF 2021/02

Energy use and modes of transport determine success of zero energy consumption and carbon emissions goals
Whether a building can reach net zero energy consumption and carbon emissions depends on the types of energy it uses, the amount of electricity used, how it offsets the consumption with renewable energy, and the commuting modes of the residents. To achieve net zero carbon and energy consumption, many large commercial buildings must seek more renewable energy sources; for example, the energy consumption of the outer shell, AC systems, and lighting equipment of a building must first be reduced while regular maintenance is carried out to save energy.

Water use and resource efficiency are keys to achieving net zero water and waste
The calculation for water use is slightly complicated: when subtracting the total alternative water used from the total potable water consumed and adding the amount of water returned to original source, the result must be zero. Alternative water can be produced through collecting roof runoff, rainwater flowing on the ground, AC condensate water, steam water, and reclaimed water. Water returned to the original water source refers to water collected from the building systems; for instance, rainwater harvested from the water conservation facilities is returned back to the ground and local catchment areas. By doing so, floods can be prevented, and a sponge city can be created.

The EU has required all new buildings built in 2021 to be zero-energy buildings. Last year, a global initiative—“Zero Carbon Buildings for All”— was launched at the UN Climate Action Summit. China already publicized its criteria for zero-energy buildings and issued its manifesto for zero-carbon buildings. Taiwan can seriously consider keeping up with global trends, formulating relevant regulations for net zero energy, and maximizing the positive contribution that buildings can make to the environment.

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amaxia Ming Chuan Elementary School has achieved its “net zero energy consumption” goal for consecutive years, hoping to obtain the LEED Zero Energy certification.