What are the application of plate heat exchanger?
Heat exchanger is a kind of highly efficient and compact heat exchangers, 1880s first as a continuous low temperature sterilization device developed, to the last century began in 20s applied in food industry. Because there are some unique features in the manufacture and use of plate heat exchanger. Therefore, the heat exchanger has been widely used in petroleum, chemical industry, light industry, electric power, metallurgy, machinery, energy and other industries, become very competitive in the heat exchanger in the family of varieties. China is to begin production of plate heat exchanger from the last century since 60s, heat exchanger in many areas of China have been widely used.
In refrigeration, heat exchanger is indispensable for refrigeration equipment, condenser, evaporator, heat exchanger and intermediate cooler heat transfer equipment, not only in the weight, volume and the consumption of metal on the refrigeration equipment accounted for more than 50%, but will also have a significant impact on the performance of refrigeration. So the heat transfer cooling heat exchanger, reduce the weight and volume, reduce metal consumption has been the development direction of refrigeration technology, now there is a new, welded plate heat exchanger type in the refrigeration technology application, and showed a strong development potential.
Refrigeration process and heat exchanger compared with the shell, in addition to the general characteristic of the heat exchanger, the refrigeration heat exchanger also has the following characteristics.
Refrigerant filling amount is small, it is conducive to environmental protection and reduce operating costs
The volume of shell side and tube side of shell and tube heat exchanger is very large, it is necessary to fill a large amount of refrigerant in order to make the cooling system work normally, and it may cause environmental pollution. On the one hand, and the heat exchanger has the advantages of small volume, on the other hand, the gap size is small.
The freezing tendency is little and the frost resistance is high.
Because the water at low flow rates, can form highly turbulent flow in a plate heat exchanger, the temperature distribution is very uniform, thereby reducing the tendency of frozen water freezing. Even if freezing occurs, it is more able to withstand the pressure generated by the freeze, rather than the shell and tube heat exchanger so easy to crack, and can continue to use.
The evaporation is thorough, and the economy is high.
The refrigerant evaporates in refrigeration heat exchanger is very easy to achieve complete evaporation to liquid level, so in most cases, the refrigeration system without setting the gas-liquid separator. And very easy to realize the unit, the installation is simple and convenient, maintenance and transportation can save costs, reduce costs.
As compared with traditional shell and tube heat exchanger, heat exchangers used has obvious advantages in refrigeration, since the last century in 70s began to be applied in refrigeration equipment, has been increasingly valued by people, especially in many developed countries, such as Europe and the United States, Japan and Australia have attached great importance to research and application of plate heat exchanger cooling. Japan began to study the refrigeration heat exchanger in the last century in 80s, and used in refrigeration equipment, has received good economic benefits, some of the world famous companies such as Carrier refrigeration grams, and Hitachi were in refrigeration device used in heat exchanger. After entering 1990s, the refrigeration heat exchanger has been further developed, a heat exchanger can be used in ammonia refrigeration system in Sweden Stehr company successfully developed. This new type of heat exchanger combines the characteristics of frame type and brazing type. Compared with the freon refrigeration system using ammonia refrigeration system, the heat exchanger not only has the obvious superiority in the unit material, volume weight, and the coefficient of performance is high to 10%~20%. At present, this system has been formed 8 products, the amount of cold from 10kw~1000kw. With the development of successful ammonia heat exchanger, not only broaden the scope of application of plate heat exchanger in refrigeration technology, but also has an important significance for protecting the atmospheric ozone, protect the environment, but also will promote the further development of refrigeration technology.
China began to produce heat exchanger, since the last century at the beginning of 60s to 1994, in the heat exchanger manufacturers of energy-saving products reached 15 points, and some manufacturers have carried out research work of plate evaporator and heat transfer, however, these manufacturers are limited to production of plate type heat exchanger (DHE). In our country, the refrigeration application of plate heat exchanger is still in its infancy, many days before refrigeration manufacturers are their products used in refrigeration heat exchanger, and its products are widely favored by the users. Can be expected, with the heat exchangers used in understanding refrigeration, heat exchanger with high efficiency heat transfer, compact structure, energy saving and environmental protection features etc, will be more and more widely used in refrigeration equipment.
Heat exchanger is a kind of high efficient and compact heat transfer equipment, which involves the application of almost all industrial areas, and its types, structure and scope of use is still evolving. In recent years, welded plate type heat exchanger compact, light weight, good refrigeration performance, low operating cost advantages have been recognized by more and more people. With the development of China's economy, the future development of refrigeration technology is ambitious, especially industrial refrigeration and air conditioning large refrigeration device used for the rapid development of the various refrigeration exchanger is adopted to provide a broad market