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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According to Kyodo News, an advanced car care company in Hyogo Prefecture will open a branch for wealthy people in Dalian, China in the summer of 2013. With the popularity of electric vehicles in Japan, the traditional car maintenance market will shrink dramatically. The company is looking forward to the development of the Chinese market: “The development of overseas businesses is a great challenge for us. We will rely on meticulous Japanese-style service to make a success in China.â€
The company will dispatch special personnel to cooperate with local Dalian companies to open 500 square meters of car maintenance companies in high-end residential areas. The maintenance company mainly serves local affluent people, adopts a membership system, and strives to develop 100 members.
In order to upgrade the store's grade, the shop has installed glass curtain walls, providing services such as car washing and coating. The Japanese car maintenance company will highlight the difference with local counterparts through Japanese high-end services such as manual car washing and interior cleaning. Some Japanese companies also plan to open a special paint factory for high-end cars in Dalian in 2016 to expand their business.
The global sales of Japanese cars have also driven the development of supporting industries. Over the years, the Japanese automobile maintenance field has formed a complete service system. In recent years, Japan's auto maintenance market has become increasingly saturated and fiercely competitive. In order to seek greater development, major companies have turned their attention to the Chinese market.