Page 201 - AGC_EN_iBook

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WateR maNaGemeNt
Run-off water is retained on site.The building’s low water con- sumption, combined with the treatment of waste water and the management of run-off water, limits the amount of water needing to be discharged.
The low water consumption is due to the use of sanitary xtures tted with ow limiters (self-closing taps, water-saving shower heads, dual ush toilets, low- ow rinsing hoses in the kitchen, etc.), as well as to the use of rainwater from the roof for ushing toilets and watering plants. A waste water treatment unit also providing water for ushing toilets rounds off the system. Rainwater is returned to the site, limiting the building’s in uence on groundwater.
In ltration basins (to the east of the building) compensate for the impermeable roof surfaces (7,500 m2).
A rainwater cistern with a capacity of 120 m3 serves as a buffer, taking in run-off water from the roof.
The planted patios also allow for the partial retention of rainwater. Roadways are made of open-jointed clinker bricks allowing rainwa- ter to lter down into the soil.
Last but not least, storm water is retained in drainage ditches constructed along the various grass-free zones.
Rainwater drainage on site
1 - the recovery rate represents the proportion of energy the system can recover, and corresponds to the ratio between actual transfer and maximum theoretical transfer.
2 - the useful output (ηuseful) of a boiler refers to its heat transfer ef ciency when the burner is on, and corresponds to the ratio between the energy content of the fuel input and the calori c value transferred to the heating water.
3 - the Lower Calori c Value (LCV) corresponds to the thermal energy released by the complete combustion of a unit of fuel, retaining the
water present at the end of the reaction in the form of vapour.
4 - Building management System.
5 - the Bacnet protocol (Building automation and Control Network), speci ed by aSHRae (american Society of Heating, Refrigerating and air Conditioning engineers), has now become an international standard.
6 - a heat pipe is a heat-transfer device that combines the principles
of both thermal conductivity and phase transition to ef ciently manage
the transfer of heat between two solid interfaces.
7 - the air ow of the installed system is 35% lower than that of a simple extraction hood and 47% lower than that of an induction hood.
8 - ‘Free cooling’ in this case involves using a chilled uid to cool the building via thermal exchange with the outside air or the ground when
the temperature of the latter is below a set temperature. apart from the electricity needed for the auxiliary equipment (circulating pumps, etc.),
the energy used is considered to be free.
9 - kWp = kiloWatt peak. Photovoltaic power capacity is measured as maximum power output under standardized test conditions (StC): sunlight (1,000 W/m2), temperature (25°C) and the spectrum of light (am 1.5). For Wallonia, peak power roughly corresponds to the concept of maximum power.