C05 -- Water Systems Design and Operational Management Plans for an Interurban Bus Terminal Nearly Zero Energy Building (nZEB)

A modern Interurban Bus Terminal Complex for the city of Athens of 52,800 m² area in 8 floors, serving up to 67,200 passengers daily, housing terminals for interurban and international buses, local buses, a shopping mall, a hotel, a conference center, underground parking and a connection to a nearby Metro station is presented, with respect to its environmentally friendly water systems design. Specifically, grey water installations and their characteristics are analyzed, with various filtering and water treatment schemes which lead in re-using the discharge water from rainwater, green roofs irrigation, bus washing and bus floor areas cleaning, into hygiene rooms WCs, bus washing and bus floor areas cleaning and irrigation of the green surrounding areas and green roofs. For the building complex, a total yearly water consumption of 230.000 m³ is estimated, with 22.000 m³ of collected rainwater, 25.000 m³ of irrigation needs and eventually with 38% of the overall water consumption being efficiently recycled and re-used, without using biological treatment installations. Energy consumption is also minimized for hot water production using extensive solar panels of 680 m² area providing up to 70% of the required water temperature increase, as well as heat exchangers coupled with high temperature heat pumps, reducing the daily CO₂ production by 0,6 tons.