Fixed tube heat exchanger consists of tube bundle, tube plate, shell, head, folded plate, etc. Tube bundle ends fixed in the tube plate, the tube can be expanded (the inner hole of the tube with mechanical expansion, so that the tube wall from the inward to outward extrusion and fixed in the tube plate) or welded to the tube plate. The tube bundle is placed within the tube shell, with headers and flanges fixed at both ends. In this way, one fluid flows from the inside of the tube and the other from the outside. The space between the two heads and the tube plate is used to distribute or collect the fluids inside the tube. The two fluids do not mix with each other, but only exchange heat through the tube wall.
Advantages: simple and compact structure, high pressure resistance, low cost and easy to clean the tube side.
Disadvantages: Risk of blockage when the tube is damaged or needs to be replaced.
When the difference between the wall temperature of the tube bundle and the shell or the coefficient of linear expansion of the material is large, a large thermal stress will be generated in the shell and the tube bundle. A flexible compensation ring (also called expansion joint) should be installed on the shell to reduce the thermal stress.
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In 2012, Mercedes-Benz trucks hit another record high in China, delivering more than 6,100 units of their products throughout the year, which still achieved a 5% year-on-year growth in the context of a 30% decline in overall domestic sales of medium and heavy trucks. With this outstanding performance, China has surpassed the United Kingdom as the world's third-largest import market for Mercedes-Benz trucks, with sales volume equal to sales in major European markets.
Mercedes-Benz trucks account for more than half of China's high-end imported truck market, and its advantages in the special vehicle and construction vehicle segment markets are particularly evident, thanks to Mercedes-Benz trucks. The extensive product lineup and its tailor-made solutions are always tailored to the needs of users.
“The year 2012 was a challenging and successful year for Mercedes-Benz trucks. In the event of a drop in the overall market, we still achieved sales growth and consolidated our competitive advantage,†said Daimler Truck China. Mr. Robert, Vice President, said: “Looking forward to the new year, we believe that in 2013, especially in the second half of the year, China’s heavy truck market will recover. With the gradual recovery of the market, our leading edge in the high-end imported truck market will also be furthered. Consolidate because we see more and more customers realizing that Mercedes-Benz trucks with outstanding total cost of ownership are their most valuable options."
In the past year, Mercedes-Benz trucks continued to increase their investment and attention in the Chinese market, such as the launch of a Mercedes-Benz team star specifically tailored to the Chinese market. In addition, Mercedes-Benz Trucks introduces the innovative Total Cost of Ownership (TCO) concept to the Chinese market, aiming to reduce the cost of trucks throughout their entire life cycle through reliable, efficient and durable products.
The increase in sales also benefits from the extensive service network of Mercedes-Benz trucks. At present, the number of Mercedes-Benz trucks in China is 41, which ranks first among European truck brands in terms of network density and service expertise.
Mercedes-Benz trucks believe that 2013 is a year in which opportunities and challenges coexist. The market demand for medium and heavy trucks will no longer reach the peak of 2010 and 2011, which will be a challenge for all truck manufacturers. However, as the logistics industry becomes more and more specialized, more and more Chinese users are beginning to favor high-end, high-quality products such as Mercedes-Benz trucks because reliable, efficient, and durable products will reduce overall product quality for them. Cost of ownership.
About Mercedes-Benz Trucks
The Mercedes-Benz truck is one of the world's largest commercial vehicle manufacturers and one of Daimler Truck's five truck brands. As one of Daimler AG's businesses, Daimler Trucks supplies a full range of products from light to heavy trucks to more than 180 countries worldwide. In addition to the Mercedes-Benz brand, Daimler also owns four truck brands, Freightliner, West Star, Fuso and BharatBenz, and the American school bus brand, Thomas Bus. Daimler Trucks manufactures and produces its full line of products through its assembly production network in 27 regions around the world.
At present, Daimler Trucks sells imported Mercedes-Benz Actros, Axor, Atego, Econic trucks and Mercedes-Benz Unimog and Seitese vehicles in the Chinese market.