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As the temperature drops, the pace of winter gradually accelerates. Shang Yu friendship reminds that the antifreeze measures of the chiller need to be understood and prepared as early as possible to avoid unnecessary losses. Today, Xiaobian and everyone share the antifreeze method and operation precautions for the industrial cold water chiller unit in the cold winter season.
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Antifreeze method for air-cooled chiller
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For air-cooled chillers, because of the air-cooling heat dissipation, there is no water-cooling system for water-cooled chillers. Only the fans need to be anti-freeze in the heat-dissipating part of the air-cooler. The focus should be on the lubricating oil of the fan. If you run continuously, you don't need to worry about the antifreeze of the lubricating oil. If the chiller is used intermittently or not used for a long time, you should pay attention to antifreeze.
SUNNY-HVAC cold box type chiller
If it is not used for a long time, the air-cooled machine should be cleaned and coated with protective oil. It is best to be waterproof to prevent frostbite in the air-cooled machine caused by cold weather in winter. If it is used intermittently, the fan oil should be scraped off when the production is stopped, and then apply an appropriate amount of lubricant when using. In the case of normal operation of the air-cooled chiller, sufficient water flow and water pressure are ensured, and the problem that the chilled water is frozen is not substantially caused.
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Antifreeze method for water-cooled chiller
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Unlike water-cooled chillers and air-cooled chillers, the cooling and cooling components of water-cooled chillers are water circulation systems rather than fan systems, so the anti-freezing task is even more difficult, even during normal operation.
Start with the water cooling system to check and prevent the cooling and freezing. In general, the water-cooled chiller is used in winter. It is recommended to add antifreeze to the cooling water, but the concentration of antifreeze in the water, the ratio of antifreeze to cooling water. Make it clear that adding less can not achieve the anti-freeze effect, and adding more will cause corrosion to water-cooled systems such as pipes and seasonings, water towers and so on.
SUNNY-HVAC water-cooled screw series chiller
In addition to the water cooling system, it should also start from the refrigerant. When the temperature is too low, the refrigerant may have a problem of changing the properties. In winter, the water-cooled chiller is not practical for a short time. It should be warmed up frequently before the formal use. It is also necessary to first open the water pump, cooling the water tower, and then open the compressor.
Pay attention to the opening and closing sequence of the industrial chiller
To ensure that the chiller can operate normally after starting, it is necessary to ensure that the condenser is well cooled, otherwise the condensing temperature and the corresponding condensing pressure will be too high, so that the chiller high-pressure maintenance device measures to stop, and even cause problems.
The cold water in the evaporator should be circulated, otherwise it will stop because the cold water temperature is low, causing the cold water temperature maintenance device to move, or because the evaporation temperature and the corresponding evaporation pressure are too low, the chiller's high-pressure maintenance device measures to stop, and even cause The cold water in the evaporator freezes and damages the equipment.
Therefore, the order of starting the industrial chiller is: (must be strictly adhered to).
Cooling tower fan on → Cooling water pump on → Cold water pump on → The chiller is on.
The order of shutdown of the industrial chiller is: (must be strictly adhered to).
The chiller stops → the cooling tower fan stops → the cooling water pump stops → the cold water pump stops.
Pay attention to:
1 Before running the refrigeration cycle, make sure that the heating circuit piping valves are all closed.
2 When the machine is shut down, the chiller should be shut down half an hour before leaving work. The cold water pump will be shut down after work, which is conducive to saving power and preventing the downtime and maintenance of the unit.
Antifreeze precautions
The function of the antifreeze for the industrial chiller is to prevent the heat exchanger, the pipe or the cylinder block of the engine from bursting due to the freezing of the coolant. Therefore, the replacement of the appropriate antifreeze is very important for the stable operation of the equipment and the extension of the service life.
It should be noted that the following important principles must be observed in the process of using and replacing antifreeze:
1. The concentration should be as low as possible. Because it has a certain degree of corrosiveness, the lower the concentration of the compound chiller, the safer it is when it meets the antifreeze performance of the industrial chiller.
2. The shorter the time used, the better. Any kind of material has a certain time limit. For example, if the antifreeze solution is used for a long time, it will deteriorate. The antifreeze after the deterioration will be more corrosive and the viscosity will change. In order to ensure the safe and stable operation of the industrial chiller, the enterprise must Pay attention to regular replacement.
3, can not mix different brands of antifreeze. When each manufacturer produces antifreeze, the ingredients used are different, and the additive formula is different. Therefore, it is forbidden to mix different types of antifreezes of different brands to avoid chemical reaction, precipitation or bubble generation, thus affecting industrial cold water. The machine runs stably.
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