INTERNATIONAL CASE STUDY NATURAL VENTILATION
Ventilation louvres vent the atrium spaces
LEED is a new standard in China and not many local manufacturers of mechanical, electrical, plumbing and interior fit out products are aware of it Dr Vincent Cheng, Arup
from the main structures and effectively insulates the offices and retail space from the extremes of Beijing’s climate, which averages 25.9°C in July and -4.8°C in January. There are two atria cutting through the site
– a diagonal space bisects an L-shaped ‘high street’ to create the scheme’s four quarters. The building was designed to minimise
the amount of air conditioning and lighting required. Arup used extensive modelling to ensure that as much daylight as possible streamed deep into the building plan. The L-shaped ‘high street’ is 24 m-wide to allow as much light as possible to enter via the roof. For more than 60% of the year natural ventilation is sufficient to maintain comfortable conditions within the offices, hotel and retail areas. To encourage the heat stack effect, Arup incorporated ventilation louvres at the top of the envelope enabling the removal of hot air. ‘These act as chimneys, allowing the warmest air to escape and creating an upward flow. As the air escapes, cooler air is drawn up from the bottom of the building, creating air movement and natural ventilation. Cool fresh air or warm air is fed into the internal areas of the buildings as required,’ says senior engineer at Arup, Gigi Kam. To meet the LEED-CS Platinum rating,
Arup aimed for a 30% better energy performance rating, compared with the ASHRAE Standard 90.1 2007. The hybrid ventilation approach offers up to 60% energy savings in the summer, compared to a
56 CIBSE Journal September 2012
conventional office air conditioning system. Overall, an energy saving of 15,820MWh is achieved annually. Meeting the requirements in Beijing wasn’t
easy, says Cheng: ‘LEED is a new standard in China and not many local manufacturers of mechanical, electrical, plumbing and interior fit-out products are aware of the standard. ‘We needed to explain and work with them
on how to achieve this standard – an exercise which turned out to be worthwhile as we were ultimately able to source almost all the materials locally.’ As a result of LEED-CS compliant design,
Parkview Green FangCaoDi is able to save up to 44% in energy consumption and 48% in water consumption. Moreover, 25% of its total building construction material is made up of recycled content and Arup also managed to recycle 81% of its construction waste material. To achieve energy savings during operation,
a building management system integrates the building services systems between the four blocks for information sharing, data transmission and system management. Through Parkview Green FangCaoDi, Arup
has proved that sustainable building is possible in the economic hothouse of the world’s fastest developing major economy. Cheng concludes: ‘The prime objective was to create a new benchmark for a technologically innovative building that provides an energy effective solution for the client, as well as for visitors and occupiers. This has been fully realised and we are all delighted with the result.’ CJ
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