Application of ammonia refrigeration technology in plate heat exchanger
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.
Shell and tube heat exchanger shell and tube side of the volume is very large, in order to make the refrigeration system working properly, must be filled with a lot of refrigerant, but also may cause environmental pollution. Plate heat exchanger, on the one hand, small size, on the other hand, the size is small.
Low freezing tendency, high frost resistance
Because of the low flow rate, the water can form a highly turbulent flow in the plate heat exchanger, and the temperature distribution is very uniform. Even if there is a freeze, it is more able to withstand the pressure generated by the freezing, rather than the shell and tube heat exchanger as easy to crack the heat pipe, and can continue to use after freezing.
The evaporation is thorough, the economy is high
When the refrigerant is evaporated in the refrigeration plate heat exchanger, it is easy to realize the full evaporation to reach no liquid level. The utility model has the advantages of easy realization of the unit, simple and convenient installation, maintenance and transportation, and low cost.
As with the traditional shell and tube heat exchanger compared with heat exchanger has obvious advantages in refrigeration, since the last century in 70s began to be applied in refrigeration equipment, has been increasingly the attention of people. Began to study the refrigeration heat exchangers used 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 in 1990s, the cooling plate heat exchanger has been further developed, a kind of plate heat exchanger can be applied to ammonia refrigeration system developed successfully in Stehr, sweden. This new type of plate heat exchanger combines the characteristics of plate and frame type. Compared with freon refrigeration system, the ammonia refrigeration system with the plate heat exchanger not only has obvious advantages in the material, volume and weight of the unit, but also has a high coefficient of performance (10%~20%). At present, this system has 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.
