Finned tube heat exchanger is one of the earliest and most successful discoveries in the process of improving tube heat exchanger. Up to now, this method is still the most widely used one among all kinds of heat transfer enhancement methods for tubular heat exchange surfaces. It is not only suitable for single-phase liquid flow, but also has great value for phase change heat transfer. However, before the 1960s, ordinary finned tube heat exchangers mostly used flat fins without any treatment on the surface structure. This type of fin has no other function of enhancing heat transfer except increasing the heat transfer area to achieve the effect of enhancing heat transfer. With the development of air cooling technology and the increasing trend of using gas medium in heat exchanger, finned tube heat exchanger has been paid more and more attention. Especially since the Sergles report on enhanced heat transfer was published at the Sixth International Conference on Heat Transfer, a large number of highly efficient fin surface structures have been developed continuously. At present, most of the finned tube heat exchangers used for live and clean gas use a new and efficient fin surface structure, which has achieved significant enhanced transfer effect.
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According to the "People's Daily" and the China Association of Automobile Manufacturers, China's auto market continued to grow steadily and rapidly in 2005, with 5.707 million cars produced in the year and 5.7852 million cars made in China; plus 160,000 imported cars throughout the year. About the sales volume, the total size of China's auto market was 5.92 million units, which surpassed the 5.8 million units in Japan, and it ranked second in the world, second only to the United States.
China's auto market continues to grow at an alarming rate, which proves that the national consumption ability and auto manufacturing capacity have improved. However, there is also a problem that cannot be ignored. It is behind the rapid increase in the size of the auto market and the developed countries in Japan and Europe. Compared with the region, there are many gaps in China's automobile society in many aspects such as the construction of laws and regulations, the structure of automotive products, the moral level of automobile drivers, and the ability to research and develop automobiles. If the pace of growth in these areas lags behind the growth rate of the auto market, it will be difficult for China's auto society to operate at a high speed.
At present, a major problem faced by the automotive society in China is the incompleteness of laws and regulations. Taking the auto three packs laws and regulations that consumers have been looking forward to for many years as an example, although many media are optimistic about the auto three packs regulations will be formally introduced in 2005, the “car three packs draft†has solicited opinions from the public for nearly a year and still has There is no news. Without the sword that protects the rights and interests of consumers, the automobile society will inevitably suffer from such discord and farce as car-rides and trailers.
Similar "missing laws and regulations" also call for perfect collision standards, standards for air pollution in cars, and so on. These policies, laws, and regulations that are closely related to automobile consumption are an important cornerstone of China's automobile society. Only by making them move toward perfection as soon as possible can we promote China's automobile society to become more humanized.
Another major challenge facing the automotive society in China is the unreasonable structure of automotive products, which is not conducive to building a conservation-oriented automobile society. For example, the “Opinions on Encouraging the Development of Energy-saving and Environment-friendly Small-displacement Vehicles†recently released by the six departments such as the National Development and Reform Commission pointed out that at present, the proportion of energy-saving and environment-friendly low-emission vehicles in developed countries and regions such as Japan and Europe accounts for 70% of the total. the above. China's energy-saving and environmentally friendly small-displacement vehicles are increasingly being favored by consumers and are growing rapidly, but the proportion is still low.
The "car morals" of the driver is an important "soft cornerstone" of China's automobile society. At present, we still have a big gap with European automotive developed countries in this respect. To get a driver's license today, you can buy a new car on the road tomorrow. However, the cultivation of driver morality requires a process that is related to the overall quality of the person. The driver can only build "harmony on the road" only by civilized courtesy.
In 2005, the performance of self-owned brand cars was impressive. In the first 11 months of the previous year, the sales volume of self-owned brand auto companies increased by 40.3%, which was nearly twice the increase in sales volume of joint ventures. Chery’s total sales of nearly 190,000 cars ranked sixth in domestic car sales, an increase of more than 110%. However, we must also clearly understand that the self-owned brand cars still need to continue their efforts in many aspects, such as the export of finished cars and the more profitable mid- to high-end car market. After all, from the total point of view, self-owned brand cars can not really provoke the "big beam" of the domestic automobile market. (Xinhua News Agency)
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