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The refrigeration principle of water-cooled direct freezing in the electroplating industry: The water from the bottom basin of the cooling tower is transported by a water pump to the condenser of the chiller for cooling, and then flows back to the cooling tower for spraying. When the water is cooled by a fan on the top of the cooling tower, it flows back to the bottom basin of the cooling tower, and the operation is repeated At the same time as the condenser dissipates heat, the refrigerant inside liquefies, and then flows into the evaporator inside the cold cannon for evaporation. During evaporation, heat is absorbed, which cools down the sulfuric acid in the cold cannon. The cooled sulfuric acid is transported to the electroplating tank through a water pump, and this is a cyclic process.

The refrigeration principle of water-cooled indirect freezing in the electroplating industry: The water in the bottom basin of the cooling tower is transported to the condenser of the chiller through a water pump to cool the condenser. When it flows back into the cooling tower and sprays down, the water is cooled by a fan on the top of the cooling tower, and then flows back to the bottom basin of the cooling tower, which runs in a cycle. The condenser dissipates heat while the refrigerant inside liquefies, and then flows into the evaporator in the water tank for evaporation. During evaporation, heat is absorbed, thus cooling the water in the water tank. The cooled water is transported to the heat exchanger through a water pump to separate it, with one side being water and the other being sulfuric acid, The sulfuric acid is cooled down through the process of heat transfer, which is a cyclic process. The advantage of this product is that it is easy to install, has a relatively longer service life than direct freezing, and is less prone to acid and alkali corrosion of the chiller

From the above, it can be seen that direct freezing and indirect freezing have the same usage effect, but it is obvious that direct freezing chillers are not as safe as indirect freezing chillers, and the former equipment is prone to corrosion and has a shorter lifespan compared to them. Direct freezing equipment has a slight advantage in price, but when compared to their service life, indirect freezing chillers are several times longer than direct freezing chillers, which can be used to calculate the value of indirect freezing chillers.