Green and sustainable is the main theme of the preparations for the Beijing Winter Olympics. The countdown to the Beijing Winter Olympics has been less than 20 days, and some innovative technologies related to the Beijing Winter Olympics have been continuously disclosed by the media, among which "water cube" has become "ice cube", and green and low-carbon technologies such as solar green building wooden models have attracted special attention. In June 2019, the Beijing Winter Olympic Organizing Committee officially released the "Beijing 2022 Winter Olympic and Paralympic Winter Games Low-Carbon Management Work Plan", working closely with all parties to jointly promote the implementation of low-carbon venues, clean energy and other measures, and strive to achieve carbon neutrality of the Winter Olympics, so that green will become the most beautiful background color of the Beijing Winter Olympics.
Patents transform the venue gorgeously
The National Aquatics Center, known as the Water Cube, made its debut at the 2008 Beijing Olympics. Today, the "Water Cube" has transformed into the "Ice Cube", once again stunning the world, becoming the world's first "double Olympic" venue to realize the "water ice conversion".
During the Beijing 2022 Winter Olympics, Ice Cube will undertake curling and wheelchair curling competitions, and it is necessary to set up a curling track on the pool and complete the curling field with 4 standard tracks. This is the first time in the history of the Winter Olympics that the difficulty is evident. 116 days, 35 construction plans, 35 tests, 485 design drawings... Talking about the process of water ice conversion, Sun Deyuan, chief engineer of the Ice Cube Project of China Construction First Bureau Group Construction and Development Co., Ltd., recorded the process of innovation with a set of numbers.
In the construction process, Sun Deyuan's team used a number of invention patents such as "turnable lightweight steel structure and concrete prefabricated panel structural system and its construction method" and "a kind of elevated floor that can be used as a static pressure box and its construction method", using lightweight modular steel components, simplifying the installation structure point, supporting structure can be assembled and dismantled many times, meeting the requirements of lightweight, stable, small deformation, ice surface without cracking, reducing solid waste pollution. When recycling the ice pipe, the application of the invention patent "an electric removable ice pipe recovery table and construction method" can quickly, safely and non-destructively recover about 34,000 meters of ice pipe one by one, avoiding the loss of refrigerant.
In order to ensure the constant temperature and humidity of the ice surface, the team developed and owned invention patents such as "a air supply system and its construction method", and sent the dry and cold air with low speed and good uniformity to the ice surface area through the new air supply system, which ensured the environmental requirements of low temperature and low humidity of the ice project, and reduced energy consumption and air pollution during production and transportation.
In addition, for the temperature problems in different areas of the venue, the team applied the ice rink environment intelligent control platform to achieve the partition control of the temperature of the indoor tall space. At present, the ice surface temperature of the curling stadium competition hall and curling track reaches -8.5 °C, the temperature at 1.5 meters above the ice surface is maintained at 10 °C, and the temperature of the grandstand is 16 °C to 18 °C, which not only meets the needs of the curling competition environment, but also creates a comfortable viewing environment for the audience. "At present, the team has successfully completed three 'water ice' conversions, and the conversion time has been shortened from the initial 60 days to 20 days today, which is a huge improvement." Sun Deyuan said that the team will fully protect the Beijing Winter Olympics and The Winter Paralympic Games in the future.
Ice plates create movable ice rinks
In order to allow more people to participate in ice and snow sports, the "Science and Technology Winter Olympics" key special project "ice and snow sports promotion and popularization of key technology product research and development and demonstration" project has been in full swing a few days ago. Beijing Institute of Technology undertook the project "Key Technologies for Mobile Removable Artificial Refrigeration Ice Rinks".
"We and Bloomage Ice and Snow Sports Management (Beijing) Co., Ltd. jointly developed the theme of the Winter Olympics 'Environmental Protection, Wisdom Mobile Ice Rink', the entire mobile ice rink demolition takes less than 46 hours, the service life is more than 10 years, the recycling rate of the ice rink has reached more than 98%, and it is suitable for more than 5 kinds of ice sports such as speed skating." Zhu Rui, a professor at the School of Astronautics of Beijing Institute of Technology, introduced that the ice rink adopts the world's leading carbon dioxide transcritical ice making technology, which is the first environmentally friendly and fast-moving ice rink in China to realize the localization of the whole process.
In addition, the team has many original technologies in the vibration and noise reduction related to the environmental protection technology of the ice rink, holds a number of patents such as "a six-degree-of-freedom ground vibration isolation system", and has submitted patent applications such as "vibration damping control device and vibration damping system for its application". It is worth mentioning that the team used the relevant patents to create a number of 1 meter × 6 meters of ice plates, according to the actual needs of the scene, 60 meters × 26 meters (Winter Olympic ice hockey standards), 1200 square meters (curling competition venue) and other sizes of the scene at will, to meet the needs of different ice sports and public activities.
"The ice plate is small, but it has a dry inside. Through them, the ice rink can be monitored and intelligently managed at all times. Zhu Rui said that the team configured temperature, humidity and other sensor devices inside the ice plate, and developed the first intelligent full-time ice rink monitoring system in China. The system combines a heat transfer simulation method to effectively manage the temperature of the ice surface to ensure the stable and safe use of the ice surface by athletes and the general public.
Photovoltaic panels create "zero energy buildings"
In June 2021, The China University of Mining and Technology and the AGH University of Science and Technology in Krakow, Poland, jointly designed the "Zero Energy Building" - a wooden model of the solar green building, which was officially selected for the final round of the 2021 China International Solar Decathlon Competition. As an important part of the Zhangjiakou National Renewable Energy Demonstration Zone Application Technology Industrial Park, the building was completed in September 2021 and will serve the Beijing Winter Olympics.
"The building uses solar photovoltaic panels and solar collectors and other equipment to generate electricity and heat energy, achieving energy self-sufficiency." Professor Chen Ning of China University of Mining and Technology introduced that the team applied modular construction technology to achieve rapid construction of buildings; the use of tubular collectors for photothermal conversion, to achieve suitable internal temperature of the building, but also to meet the needs of bathing and other needs, and made substantial progress in energy system innovation. The team submitted a number of patent applications around the relevant technology, such as "a self-locking modular steel structure connection node".
Extremely cold weather of -40°C may occur in the Zhangjiakou Zhangbei area in winter, and the heating design of the energy system in winter is a major challenge for the team. To this end, the team proposed a collector cross-seasonal heat replenishment scheme, which combines solar solar heat with cross-seasonal energy storage in buried tubes to realize the storage of the heat of the summer sun into winter use.
In addition, the team also explored the use of the atrium space of the building, and applied technologies such as landscape, water treatment, and humidification integration to organically combine building structure, landscape, energy, water supply and drainage, which not only saved space but also beautified the environment. Chen Ning said that in the future, the team will continue to explore in the fields of solar energy utilization, storage, construction and environment, form more innovative achievements, and contribute to the low-carbon Winter Olympics. (Liu Hongyi)
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