The difference between direct freezing and indirect freezing

issuing time ：2019-06-14

The cooling principle of cold water direct freezing in electroplating (oxidation) industry is that the water in the bottom basin of cooling tower is transferred by water pump to the condenser of the chiller to cool the condenser, and then flows back to the cooling tower through the fan on the top to cool the water and then flows back to the bottom basin of cooling tower. At the same time, the refrigerant in the condenser dissipates heat, and then flows into the evaporator for evaporation, which absorbs heat and cools the sulfuric acid (bath liquid) in the cold gun. After cooling, the sulfuric acid is sent to the electroplating (oxidation) tank by water pump, which is a cycle process of direct freezing in industrial chiller. Fast cooling.

The cooling principle of cold water indirect freezing in injection molding and electroplating (oxidation) industry is that the water in the basin at the bottom of the cooling tower is transferred to the condenser of the chiller through the pump to cool the condenser. When it flows back to the cooling tower, the water is cooled by the fan at the top of the cooling tower, and then flows back to the basin at the bottom of the cooling tower, thus running round and round. Condenser cooling inside the refrigerant liquid at the same time, and then flow into the evaporator through evaporation, and evaporation to absorb heat, thereby cooling of the water in the tank, after cooling water through the pump to the heat exchanger (middle separated, sulfuric acid, while water), again through the heat transfer process of sulfuric acid is cool, so a cyclic process. This product has the advantage of easy installation, long service life compared with direct freezing, acid and alkali are not easy to corroded chiller. But it doesn't cool as fast as freezing it directly.

It can be seen from the above that direct cooling is better than indirect cooling in terms of cooling speed, but it is obvious that direct cooling chiller is not as safe as indirect cooling chiller, and the former is prone to corrosion and has a shorter service life. However, compared with the service life, indirect freezing chiller is several times longer than direct freezing chiller, so the value of indirect freezing chiller can be calculated.