What are the black technologies of the new speed skating hall in Beijing Winter Olympics?

Green Olympics is one of the characteristics of previous Beijing Olympic Games, and this Winter Olympics has also brought green and low carbon to a new height. Known as? Ice ribbon? The National Speed Skating Hall is also the only new venue for the Beijing Winter Olympics. ? Ice ribbon? In Wukesong Sports Center, the carbon dioxide transcritical refrigeration system is adopted, the ice temperature difference is controlled within 0.5℃, and the carbon emission is close to zero. At the same time, the integrated design of refrigeration and heating is adopted to recover the residual heat of refrigeration, and the energy efficiency is improved by 30%-40%. This technology was first applied to the Winter Olympics on a large scale.

In addition, during the Olympic Games, there will be more than 700 hydrogen fuel buses in Yanqing and Zhangjiakou, and the trial-produced hydrogen fuel cell emergency generator will replace the diesel generator, which has been tested and stored in the National Speed Skating Hall and the National Alpine Skiing Center.