Abstract
In the practice of the Beijing Olympic Winter Games in 2022 for the renovation and reuse of the 2008 Olympic legacy venues, PVC film-based clips integrated with the black coated fabric were employed as a shielding material, to reduce the influence of sunlight under the ethylene tetrafluoroethylene (ETFE) air pillow ceiling system and maintain a good and stable indoor environment. Based on winter outdoor meteorological parameters, we measured the temperature; solar irradiance; and illuminance of the playing field, as well as the upper and lower surfaces of the ceiling enclosure and its internal cavity. Meanwhile, a simulation of the indoor environment before and after the shielding was carried out. The distribution and transmission mechanism of light, humidity, and heat in the venue were studied. It was found that the shielding material can block more than 98% of the sunlight and solar radiation; and after the addition of shielding material, the temperature of the playing field changes throughout the day about 1 °C. The difference between the surface temperature under the ceiling and the indoor temperature is about 3 °C, which is not easy to condense. The physical characteristics of the shielding of the roof enclosure structure are revealed, and the shading and heat insulation performance of it is verified, so that the venue meets the requirements of the Olympic Winter Games in the indoor environment.
Highlights
There is a trend towards greater building transparency, strengthening the interaction between outdoor and internal spaces, and glass is the main type of transparent enclosure material used in practical engineering
A membrane structure that is commonly built with new materials such as ethylene tetrafluoroethylene (ETFE) is applied as an alternative to glass via the flexibility of the ETFE membrane for the curvature of the building [1,2]
The National Aquatics Center of China is the largest building in the world utilizing an ETFE air pillow structure as its building envelope
Summary
There is a trend towards greater building transparency, strengthening the interaction between outdoor and internal spaces, and glass is the main type of transparent enclosure material used in practical engineering. Numerous large-scale public buildings, such as stadiums, are constructed with ETFE air pillows as the roofs or building envelopes [3]. The National Aquatics Center of China is the largest building in the world utilizing an ETFE air pillow structure as its building envelope. A double translucent pillowed ETFE structure integrated with a cavity is employed in the National Aquatics Center. The transparent or translucent ETFE air pillows provide good lighting, and bring problems such as reduced indoor comfort and high cooling energy consumption in the summer. The lighting advantage of the ETFE structure has become a disadvantage in the Winter Olympics, while a large amount of solar radiation increases the load of the ice-making system. There is still limited information on the actual thermal and humidity behavior of the double ETFE air pillow structure.
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