Heat exchanger heat transfer enhancement technology
Heat exchangers are one of the most widely used equipment in a wide range of industries. Its performance is improved, not only to improve energy efficiency, but also to miniaturize equipment. With the development of science and technology and the improvement of people's living standards, the world's energy consumption is growing rapidly, and it is particularly important to improve the efficiency of heat exchangers and reduce energy consumption. Generally, the performance improvement of the heat exchanger is achieved by an increase in the convective heat transfer coefficient between the fluid and the solid wall in the heat exchanger. Heat transfer enhancement technology is the technology for this purpose. The performance of the heat exchanger can be improved from two levels. The first level is to improve the convective heat transfer coefficient between the fluid and the wall, including: various ribs, inserts, turbulence generators, etc.: second The level is to improve the performance of the heat exchanger under the same convection conditions. For example, changing the flow pattern of the hot and cold fluid in the heat exchanger will affect the performance of the heat exchanger. Under the same number of heat transfer units, the countercurrent heat exchanger has the highest efficiency, the downstream heat exchanger has the lowest efficiency, and the other heat exchangers such as cross flow have the same efficiency.
The worldwide energy crisis that emerged in the early 1970s has led to rapid development of heat transfer enhancement technology. Until the early 1990s, the literature on heat transfer enhancement published every year increased exponentially. In terms of specific technology, it can be divided into passive reinforcement technology and active reinforcement technology. The former refers to reinforcement technology that does not require external power, including extended surface (various ribs), inserts, cyclones and turbulence generators: the latter It refers to the strengthening technology that needs to input the external power, including mechanical vibration, application of electric or magnetic field, addition of additives in the fluid. By the end of the 1990s, some people believed that heat transfer enhancement technology gradually became a conventional technology. Coupled with the relative stability of world energy prices, the demand and enthusiasm for enhanced heat transfer technology research was not as high as before. However, Be sed espl believes that heat transfer enhancement technology is still expanding its new application areas, such as the process industry, which needs to be matured almost everywhere. These applications have called for the development of new heat transfer enhancement techniques such as three-dimensional ribs, three-dimensional rough elements, longitudinal vortex generators and composite strengthening techniques, which are known as third-generation heat transfer enhancement techniques.
The worldwide energy crisis that emerged in the early 1970s has led to rapid development of heat transfer enhancement technology. Until the early 1990s, the literature on heat transfer enhancement published every year increased exponentially. In terms of specific technology, it can be divided into passive reinforcement technology and active reinforcement technology. The former refers to reinforcement technology that does not require external power, including extended surface (various ribs), inserts, cyclones and turbulence generators: the latter It refers to the strengthening technology that needs to input the external power, including mechanical vibration, application of electric or magnetic field, addition of additives in the fluid. By the end of the 1990s, some people believed that heat transfer enhancement technology gradually became a conventional technology. Coupled with the relative stability of world energy prices, the demand and enthusiasm for enhanced heat transfer technology research was not as high as before. However, Be sed espl believes that heat transfer enhancement technology is still expanding its new application areas, such as the process industry, which needs to be matured almost everywhere. These applications have called for the development of new heat transfer enhancement techniques such as three-dimensional ribs, three-dimensional rough elements, longitudinal vortex generators and composite strengthening techniques, which are known as third-generation heat transfer enhancement techniques.
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