How to Select Antifreeze for Chillers?

In order to smoothly improve the cooling performance of the chiller, after a period of use, enterprises need to regularly maintain the chiller.

When conducting maintenance, especially in winter, do not neglect to replace the antifreeze of the chiller. If the antifreeze is not replaced or refilled during the maintenance of the chiller, the cold winter temperature is likely to cause the pipes to freeze. Then, when the chiller is operated for a long time, the equipment is prone to various common faults, which seriously affect the service life of the equipment and even lead to a continuous increase in the operating cost of the chiller.

High-quality antifreeze can keep the chiller running safely and stably. If the enterprise neglects to replace the antifreeze during the maintenance of the chiller, the equipment is likely to experience high-temperature faults after running for a long time. When the chiller is in a high-temperature fault situation, it not only affects the operating power of the chiller but also leads to a continuous shortening of the operating life of the chiller unit. The shortening of the chiller's life affects the cost of the enterprise using the chiller, resulting in more energy consumption as the enterprise uses the chiller for a longer time.

So, how should the antifreeze for the chiller be selected?

When replacing the antifreeze product, it is necessary to select an antifreeze that is suitable for the operating standards of the equipment.

If the operating indicators of the antifreeze are low, it is likely to cause common faults of the chiller, endangering the operating safety and life of the equipment. Replacing the antifreeze suitable for the equipment can extend the service life of the antifreeze and provide conditions for saving the operating costs of the industrial chiller.

Commonly used antifreezes mainly include:
① Ethanol.

Both the freezing point and boiling point of ethanol are relatively low. To prevent ignition, it is generally not used.
② Glycerol. The price after mixing with water is very high, and it is not very economical.
③ Ethylene glycol. The freezing point of ethylene glycol is -11.5°C and the boiling point is 197.4°F. After mixing with water, the lowest freezing point can reach -68°F; Ethylene glycol is prone to corrode metals, and an anti-corrosion agent should be added when preparing the antifreeze. Generally, 2.5 to 3.5 grams of disodium hydrogen phosphate and 1 gram of dextrin are added to each liter of antifreeze; Ethylene glycol has strong hygroscopicity, and the storage container should be sealed; Ethylene glycol is not easy to volatilize, and the dosage is small during preparation, so it is widely used. The thermal expansion of various antifreezes is relatively large, and it can only be filled to 95% of the total capacity of the cooling system during filling; When preparing the antifreeze, its freezing point should be 5 degrees lower than the lowest temperature in the area of use.