U tube heat exchanger is suitable for the large temperature difference between tube side and shell side. The shell side media is easy to scale and needs cleaning, while the tube side media is clean and not easy to scale. It is also suitable for high temperature, high pressure, fluid corrosive working conditions.
Each heat exchange tube is bent into U-shape, the two ends are fixed in the upper and lower areas of the same Tube Sheet, and divided into two chambers of inlet and outlet with the partition in the tube box. This kind of heat exchanger completely eliminates the thermal stress, the structure is simpler than the floating type, but the tube side is not easy to clean.
The number of tubes is small, the utilization of the tube sheet is not frequent, and the shell side fluid is easy to short circuiting, which is unfavorable to heat transfer. If there is a leak or damage in the tube, the external U-tube can be replaced, while the broken inner tube can not be replaced, only plugged, and one broken U-tube means two broken, so the U-tube easily scrapped.
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According to the report of the China Securities Daily on March 14, an enormous irresistible natural disaster may change people’s consumption psychology in the affected areas, and changes in consumer psychology will curb consumption in the short term, but in the medium to long term it will stimulate domestic demand and promote Consumption growth. The strong earthquake in Japan, the short-term shutdown of the auto industry and other factors may affect the rapid decline in production and sales. In the medium term, the demand for domestic purchases soared and the output increased.
Japan’s auto industry’s current export dependency has averaged over 50%, and overseas markets are bound to cause short-term market share decline due to the impact of short-term export of whole vehicles and related parts and components. Japanese companies with strong export dependence may be affected. Larger.
The earthquake in Japan may affect the short-term consumption structure of China's auto industry and accelerate the process of localization of Japanese auto parts. The suspension of production by auto companies in the short term caused by the Great Earthquake in Japan may accelerate the change in the consumption structure of the domestic auto market. Judging from the structure of China's current imported vehicle sales, German cars have a fierce momentum in catching up with high-end brands. In the same period, the proportion of Japanese car imports fell slightly. The parking of Japanese auto giants Toyota, Honda and Nissan, which were caused by the earthquake in Japan, will further reduce the short-term market share of high-end brands such as Lexus in the Chinese market and indirectly benefit the imported German car market. In addition, from the perspective of the domestic auto market structure, the trend of accelerated development at both ends of the market may become even more apparent, which will help confirm the advantages of high-end imported models to further promote the German cars whose brand has a rallying force in the mid-range market, and continue to be the main cost-effectiveness. And to further seize the Korean cars in the third and fourth line market in advance.
The earthquake in Japan may affect the short-term consumption structure of the Chinese auto industry and accelerate the process of localization of Japanese auto parts. The suspension of production at Toyota, Honda, and Nissan plants will reduce the short-term market share of high-end brands such as Lexus in the Chinese market, and indirectly benefit the German and other imported car markets.