[Explanation] Recently, the 2022 Beijing Winter Olympics have come to an end.
This Winter Olympics is based on the concept of "green, sharing, openness and integrity". A series of new technologies, new applications, and new products have been put into use. A large number of technological elements have been deeply integrated into the construction of venues and event guarantees to help the Winter Olympics with technological wisdom. .
[Explanation] Liu Kai, who graduated from Harbin University of Commerce, led the team to apply carbon dioxide (R744) transcritical direct cooling ice-making system technology to the construction of the first Winter Olympic venues in the first stadium group, which also helped the Winter Olympics become a historic event. It is the first Olympic Games to use energy-based refrigeration systems and environmentally friendly refrigerants on a large scale.
[Concurrent] Liu Kai, Refrigeration Technical Engineer
In terms of energy conservation and environmental protection, the GWP value of carbon dioxide is basically 1, and carbon dioxide itself, we call it a natural working fluid, so its carbon emission to carbon dioxide is basically zero, and it will not affect the atmosphere or other Contaminated.
[Explanation] Liu Kai told reporters that this system has the advantages of high safety, low energy consumption and operating costs, and environmental friendliness, and all the heat can be recycled, which enables the efficient operation of the venue's energy system with integrated cooling and heating.
In addition to being green and environmentally friendly, carbon dioxide ice-making has another important advantage: the ice-making is fast and the temperature of the ice surface is uniform.
The uniform temperature and the smaller the temperature difference, the smoother the ice surface, the more conducive to the skater's gliding, and the more conducive to creating good results.
[Concurrent] Liu Kai, Refrigeration Technical Engineer
Figure skating requires an ice temperature of minus 3.2°C to minus 3.5°C for international ice-skating masters. Because some movements such as three-and-a-half and four turns of the body must be considered, the ice quality of the ice is required to be softer, but also The required uniformity of the ice surface is very good, so that our athletes can perform well.
The short track is the required minus 6.7 ℃ to minus 7.0 ℃, the purpose is that the ice of the short track is slightly harder, but to achieve the result, that is to say, to reach its optimal point of minus 6.7 ℃ to minus 6.8 ℃, and at the same time The overall uniformity must be very good to get results.
[Commentary] The Winter Olympics schedule is coherent, and the ice quality required for figure skating and short track competitions is also different.
Liu Kai told reporters that after a game, it is necessary to quickly adjust the ice temperature, and to complete the change of the venue in a short time without affecting the subsequent games.
[Concurrent] Liu Kai, Refrigeration Technical Engineer
The actual difficulty of changing the ice temperature is that there are many times. After the trick competition is over, it will switch to a short track and enter the competition. The warm-up competition is only three hours, and the time is short. At that time in Korea, it was It took three hours to convert, and then to our Capital Gymnasium, it was possible to convert in two hours, and it could be completed in two hours.
[Explanation] Liu Kai said that it is not only for the energy conservation and environmental protection of the Winter Olympics, but also for the "proofing" in the Winter Olympics. It is hoped that this technology will also promote "green refrigeration" in the future, making refrigeration more low-carbon and environmentally friendly.
[Concurrent] Liu Kai, Refrigeration Technical Engineer
The practice of transcritical carbon dioxide itself is the Green Winter Olympics. If the whole area of refrigeration is implemented in the future, it will accelerate the advancement of green environmental protection technology. After the Olympic Games are done, some things that everyone dared not do will gradually become clear. Turning to civilian use, as well as turning to cold chain, will turn in this direction.
Sun Hanlun and Zhou Zhibo report from Harbin, Heilongjiang
Responsible editor: [Cheng Chunyu]