Due to the presence of colloids, heat exchanger dirt, impurities in the colloidal state. As a result, it can also cause damage to heat exchangers, and the performance of heat exchangers has also been improved. The application of heat exchangers in refrigeration industry will become more common. As technology advances, the characteristics of heat exchangers should be taken into account, and strength and weakness should be prevented in practice. Mud microorganisms are mainly iron compounds.

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