Premier immeuble "zéro carbone" à Hong Kong

L'immeuble mis en service à Hong Kong va au delà des exigences d'un bâtiment à "énergie zéro" puisqu'il produit de l'énergie et la redistribue sur le réseau. (en anglais)
Hong Kong buildings account for 89% of total electricity consumption, mostly generated by fossil fuels. All generated electricity accounts for 68% of total greenhouse gas (GHG) emissions.

In order to set an example, Hong-Kong’s Construction Industry Council commissioned its first Zero Carbon Building (ZCB).
A ZCB goes beyond the common definition of zero energy buildings (ZEB) producing on-site renewable energy and exporting part of it to the grid.
In this case, energy is produced by biodiesel trigeneration. The building constructed following a careful study of the local microclimate and at a distance from potentially overshadowing buildings also integrates 1015 m² of crystalline PV panels with high output.
ZCB gives priority to energy conservation by passive design, thus reducing its reliance on mechanical systems. A greenery coverage of about 3,700 trees occupies over half the site, providing shade and acting as a carbon and heat sink. The building’s emplacement was carefully planned to receive the south easterly prevailing wind and daylight is harvested from the double-height north windows, while interior brightness is amplified thanks to a sloped reflective ceiling.
A large open-plan and cross-ventilated layout allows for a minimized AC cooling load in peak summer periods.
The AC system consists in under–floor air-supply combined with radiant cooling and dessicant dehumidification which pre-treats the air before cooling, allowing for energy savings. It provides desired room conditions of 26°C and 55% relative humidity. High Volume Low Speed (HVLS) fans are used in non–summer periods providing gentle and uniform air velocity.

Over Arup & Partners HK limited, the engineers who designed the building with architects from Ronald Lu & Partners stress the importance of occupant behavior in contributing to more sustainable buildings. Hong Kong ZCB itself is open for public visits or tours as an information centre offering an opportunity to educate people on a green lifestyle through real experience.

First Zero Carbon Building in Hong Kong, A. Lai et al., CLIMA 2013

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