U-tube refers to a heat exchange tube shaped like a U, which is an important part of a U Type heat exchanger. Advantages of U-shaped tube: The U-shaped tube heat exchanger has only one tube plate, both ends of the tube are fixed on the same tube plate, the tube can be stretched freely, no thermal stress, and the thermal compensation performance is good; the tube side adopts double tube side, The process is longer, the flow rate is higher, the heat transfer performance is better, and the pressure bearing capacity is strong. The tube bundle can be drawn out from the shell, which is convenient for maintenance and cleaning, and the structure is simple and the cost is cheap. The disadvantage of the U-shaped tube is that due to the limitation of the radius of curvature of the bend tube, the arrangement of the heat exchange tubes is less, the innermost tube spacing of the tube bundle is relatively large, the utilization rate of the Tube Sheet is low, and the shell-side fluid is easy to form a short circuit, which is harmful to the transmission. When the tubes are leaked and damaged, only the U-shaped tubes at the periphery of the tube bundle are easy to replace. If the inner heat exchange tube is damaged, it cannot be replaced, but can only be blocked. Moreover, one damaged U-shaped tube is equivalent to two damaged tubes, and the scrap rate is relatively high.
U-tube,U Shaped Tube,Bundle Tubes,U Tube Bundle Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.jiemaheatexchanger.com
The incident of NVC's equity has ended. Wu Changjiang was arrested on suspicion of misappropriation of funds. Wang Donglei became the chairman of NVC Lighting, and NVC was on the road to the rule of law. However, NVC lighting paid a painful price. During the NVC equity crisis, some of NVC's operations were suspended for more than two months, which adversely affected the normal operation and annual performance of NVC Lighting Group, making NVC Lighting's 2014 results unsatisfactory. According to NVC Lighting, revenue reached 3.471 billion yuan in 2014, down 8% year-on-year; gross profit was 742 million yuan, down 7% year-on-year; loss before tax was 315 million yuan, down 188.8% year-on-year; profit attributable to owners of parent companies was - 354 million yuan, a decrease of 244.52% compared with 2013. In fact, NVC Lighting achieved a revenue of 3.798 billion yuan in 2011. In other words, in recent years, NVC's market competitiveness has been steadily declining, even in the back. NVC Lighting's dispute over power in 2014 is completely giving the market to its competitors. It has broken the hearts of dealers and agents in the market layout and sales channels, and it has also brought deep concern to consumers and investors. Questioning. After Wang Donglei became the chairman of NVC Lighting, he said that he would resume normal business structure and market confidence as soon as possible. At present, Wang Donglei is actively promoting NVC's enterprise transformation. First, establish O2O (online to offline) marketing system, transform to mobile Internet, establish a digital marketing system; second, carry out LED technology transformation and increase research and development of LED With production, master the right to speak in the industry. Under the leadership of Wang Donglei, the transformation of NVC has achieved initial results. The O2O platform has opened online payment function. After the first round of pilot projects in Shandong and Jiangsu provinces, NVC O2O stores expanded rapidly to 300. The traditional offline store O2O interface has been re-installed and will be further in 14 provinces across the country. 30 counties and cities landed. At the 2015 China LED Fengyun Conference on October 19th, NVC Lighting won three heavyweight awards: NVC Lighting won the top ten outstanding technology companies in the LED industry; NVC LED downlights won the LED single product king; NVC Lighting Wang Donglei, Chairman of Dehao Runda, won the LED industry's top ten with his excellent case of the synergy between DHL and NVC in upstream and downstream resources, and NVC's strategic transformation of leading the industry transformation and implementing O2O operational changes. The honorary title of Fengyun. These awards prove that NVC has a solid foundation in the LED field and is a leader in the LED industry. Wang Donglei also has enough strength to lead NVC to a better future. In the past six months, Wang Donglei, whether facing the industry or facing the media, he did not hesitate to say that our goal is very clear. NVC is already a leader in the domestic industry and will hit the top three in the future. The development of NVC to the top three in the world has become the goal of Wang Donglei's second half of life. Since the beginning of this year, NVC Lighting's overseas market business has steadily advanced. Under the leadership of Wang Donglei, NVC vigorously promoted the sales of the NVC brand in foreign mainstream channels, replicated the successful experience of the UK market, and comprehensively accelerated the expansion of NVC's overseas market, focusing on emerging markets such as India, Brazil, the Middle East and Africa. At the beginning of this year, NVC Lighting's overseas business unit held a new product promotion conference in five countries in the Middle East to showcase a variety of LED products, covering light source, hotel, office, outdoor and other fields. The excellent quality of the products was widely praised by the guests. . While gradually regaining its position in the lighting market, NVC is still expanding its overseas market and expanding its market share. In the future development plan of NVC Lighting, Wang Donglei has already had a blueprint in his heart. In the future, NVC will continue to plow in the Chinese market, do better and better, and gradually occupy the global market.