Plate heat exchanger is an important accessory on the refrigeration host, it is made of a group of corrugated metal plate combination, the plate has four angular holes for heat transfer of the two kinds of liquid through, guiding the fluid to flow through their respective channels alternately, heat exchange, they are arranged closely, high precision, small volume, high heat exchange efficiency, space saving, the use of the environment requires high, suitable for use in small refrigeration units. General air-conditioning equipment in the normal maintenance of maintenance can be used for 15 years to 20 years, but the host of the plate heat exchanger was struck through the case, the main reasons are analysed as follows:.
1, maintenance problems
Plate heat exchanger after a long period of operation, the need for regular cleaning, generally two years cleaning. Such as the current plate heat exchanger can be disassembled to a piece of individual cleaning, but the general refrigeration engineering host plate heat exchanger can not be disassembled, can only rely on the opening of the heat exchanger inlet and outlet pipe valves and silk plug to clean, so the heat exchanger is very difficult to clean, and easy to clogging, fouling, once a part of the channel in the heat exchanger is clogged, the rest of the channel will have to withstand the flow of all the unit of water, so that the The flow rate through the plate heat exchanger increases, the friction increases, and the wear and tear is accelerated.
2, plate for material problems
Compared with other heat exchanger heat transfer surface, plate heat exchanger heat transfer surface is quite thin, that is, 0.5mm, the maximum permissible corrosion degree of 0.05mm/year. The material of ordinary plate heat exchanger usually uses alloy material (304 or 316), 304 is one of the cheapest austenitic stainless steel, which is corrosion-resistant to a certain range of organics, but weakly resistant to hydrochloric acid and sulphuric acid. General air conditioning host plate heat exchanger material used is 304, then after 8 years, the plate will breakdown, corrosion is inevitable.
3, installation problems
The system is only equipped with a "Y" filter, not installed electronic water treatment devices, so it is difficult to ensure that the piping system does not scale. In addition, if the "Y" filter cleaning is not timely, so that the circulating water is still residual even on the shell and tube heat exchanger basically does not constitute a hazard of tiny gravel, there will be a wear and tear of the plate heat exchanger hazards.
4, plate for plate plate processing technology problems
Plate heat exchanger plate processing technology is not scientific, the overall plate wall thickness is not uniform, the normal use of the thinnest place is prone to perforation.
5, the use of environmental temperature problems
Plate heat exchanger using the ambient temperature is too low, plate breakdown is frozen, plate exchange content area is small, the structure itself there is not much room for expansion, a freeze will be bad.
6, the working conditions of water quality
At present, the plate heat exchanger using the poor water quality, and most of the purification, filtration treatment, scaling, corrosion is widespread. Resulting in plate heat exchanger plate is more likely to appear perforated. Other atypical reasons such as water hammer, collision and so on will not be mentioned.
