Twisted Tube Heat Exchanger is to strengthen the turbulence of the flowing gas/fluid, so that the gas and the tube wall contact thoroughly. In addition to enhancing heat transfer, the twisted tube heat exchanger also has the advantages of reducing scaling, self-supporting between tube bundles, no baffle plate elements and so on.
With that being said, novel Twisted Tube Heat Exchanger is much more efficient than conventional tubular heat exchanger, or Shell And Tube Heat Exchanger. Twisted tube heat exchangers are also used in applications where the fluids are corrosive or contain particulates, as they are better able to handle these conditions than other types of shell and tube heat exchangers or Air Heat Exchanger.
Twisted tube heat exchangers are constructed from a series of twisted tubes arranged around a central tube. The tubes are twisted in such a way that the fluid will change direction multiple times as it passes through the exchanger. This increases the turbulence of the fluid and creates a larger surface area for the heat exchange, which increases the efficiency of the exchanger.
The shell is usually made from a thick metal such as carbon steel, which increases the durability of the exchanger.
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In September, the total sales volume of major products in the construction machinery industry increased by 11.16% year-on-year, with loader growth of 16.9%, motor grader growth of 32.09%, roller growth of 32.57%, and excavator growth of 15.78%.
After the decline in sales in 2012, the construction machinery industry continued to suffer from the lack of market demand this year and faced downward pressure. Faced with the severe situation, construction machinery companies actively responded to market changes, accelerated the transformation and upgrading, and the industrial economy showed gradual recovery and steady development.
According to statistics, the construction machinery industry began to experience different degrees of monthly sales growth from March, but sales are still at a relatively low level. Based on the data for the first nine months of the year, sales of products other than truck cranes and pavers have narrowed down. From August onwards, the total increase of all products has turned from negative to positive. By the end of September, the loaders, bulldozers, industrial vehicles, and road rollers The sales volume has achieved positive growth, and the monthly decline in the excavator's peacemaking machine has gradually decreased. It is expected that positive growth will be achieved by the end of the year.
From the aspect of import and export, the import and export trade volume of China's construction machinery in the first three quarters was US$18.414 billion, the import amount was US$3.64 billion, and the export value was US$14.774 billion. On the one hand, the decline in imports has gradually narrowed. In September, imports fell by 6.45% and returned within 10%. On the other hand, exports of construction machinery are at a high level of slight growth. Since the beginning of this year, exports have always maintained relatively low growth. By the end of September, the growth in exports has dropped to only 0.23%, continuing the trend of cumulative export growth since May of less than 1%. It is not easy to maintain export growth after high export growth for consecutive 33 months. It also indicates that China's export of construction machinery products will embark on the track of slow and steady growth.
“At present, the development trend of the construction machinery industry tends to be stable. From the data point of view, the sales volume has already got rid of the decline channel, but operating income and profits are still showing a negative growth trend.†Lu Ying, Director of Statistical Information Department of China Construction Machinery Industry Association, said this year In the first three quarters, the overall demand for the construction machinery market was relatively stable, and the market demand showed structural changes. Market demand for small and medium sized excavators, road rollers, piling machinery, tower cranes, and forklifts increased. In contrast to the expectation for a market turnaround, companies focus more on internal quality improvement, technological innovation and new product R&D than ever before, and companies pay more attention to the improvement of sustainable development capabilities. This is important for the long-term healthy development of the construction machinery industry in the future. basis.
Lu Ying believes that although there are still many difficulties in the current operation of the industry, this is a “pain period†that should be experienced during the period from rapid growth to stable growth. It takes more time for companies in the industry to assess the situation and spend more time on scientific development goals than to pursue temporary market indicators.
“At present, the impact of the national steady growth policy on the development of the industry is gradually emerging. The long-term and stable macroeconomic environment can be expected. The construction machinery industry will gradually embark on the road to stable development. It is expected that the overall situation of the industry will stabilize in the next two years. "Lv Ying suggested that all construction machinery enterprises should continue to accurately grasp the market situation, closely follow the needs of users, absorb the lessons of excessive competition in the previous period, avoid blind pursuit of market share and sales rankings, abandon unhealthy distribution methods and rush to develop Concept, strengthen the risk prevention and control system, digest the adverse consequences of the previous overdraft market, so as to maintain the just-established business turnaround situation and realize the healthy development of the company.