How to maintain the water-cooled chiller for more than two years?
In winter, when the chiller is operated in severe cold weather, especially in the north, the chiller must remember to take anti-freezing measures. If it is not done properly, a good chiller will cause irreparable losses due to this trivial matter.
And along with the severe cold weather, many factory chillers began to shut down, but before closing, the water in the system pipes must be drained. Use in the coming year can proceed smoothly to avoid production delays caused by damage to the units.
The following editor will take you to review the specific measures for anti-freezing of the chiller: it is very simple, you can see it at a glance.
Different protective measures for different types of chillers:
Air-cooled chillers, because most of the chillers are placed outdoors, and the temperature is relatively lower than indoors. For air-cooled chillers, there is no cooling water circulation system, so you should increase the antifreeze of the fan, check and add appropriate amount of lubricating oil.
If the air-cooled unit is not used for a long time, the air-cooled unit should be cleaned up, coated with protective oil, and the frostbite unit should be placed; during intermittent use, ensure sufficient water flow and pressure in the system to prevent the internal water from freezing and freezing the unit.
Although water-cooled units are generally located indoors or underground, and the ambient temperature is slightly higher than that of air-cooled units, water-cooled units rely on water circulation to transfer heat instead of fans to dissipate heat. Therefore, water-related piping and systems must take adequate antifreeze measures .
Water-cooled units are antifreeze. One is to add an appropriate amount of antifreeze. Because the content of antifreeze is too high or too low, it will bring harm to the system. Adding less will not have the antifreeze effect, and adding more will cause corrosion of pipelines, pipe walls and towers.
The second is to pay attention to the condition of refrigerant and refrigerating oil. The characteristics of refrigerant may change at too low temperature, and refrigerating oil will increase its viscosity due to too low temperature, which will cause the compressor to wear. So pay attention to the condition of freezing oil and refrigerant in winter.
If the ambient temperature in winter drops below 0 degrees and the chiller is not used for a long time, the equipment should be drained in time, and the chiller, pipes, pumps, chillers, valves, and connections should be drained to prevent water from freezing. Damage to the equipment.
The following is a summary of the method of drainage combined with our equipment:
1. Condenser, open one end of the condenser to drain the internal water.
2. For the evaporator, open the drain valve under the evaporator to drain the water. It is best to keep the drain valve normally open and turn it off next year.
3. Water pumps and pipes, the water pumps and pipes should be drained from the lowest point.
4. For the cooling tower, open the drain valve of the cooling tower water pan to drain the water.
5. At the end, the drain valve at the bottom of the coil is opened to drain water, and it is in a normally open state. It will be closed in the coming year.
Antifreeze selection and precautions:
There are many types of antifreeze, such as ethanol, glycerin, ethylene glycol, etc., but most domestic and foreign use ethylene glycol as antifreeze, and concentrated antifreeze needs to be softened and adjusted to a certain concentration according to the temperature of use. be usable.
For example, in areas with a low temperature of -5°C, ethylene glycol antifreeze with a volume concentration of 12.8% can be used; in areas with a low temperature of -10°C, a concentration of 22.0% can be used, and in areas with a low temperature of -30°C ; Available volume concentration is 43.8%.
When using antifreeze, pay attention to the corrosiveness of the antifreeze to the unit. If it has been used for a long time, it should be replaced. Do not mix different brands of antifreeze!
Taking anti-freezing measures in accordance with scientific methods in winter will protect the equipment from frostbite in low-temperature environments and extend the service life to a certain extent. Here, Kai Deli reminds industry friends to take anti-freeze measures, intermittent use, please keep the pipeline water Flow, and add antifreeze, remove the water from the system if it is not used for a long time, and it can be used normally and safely in the coming year.