Temperature : The outlet temperature of the cooling water should not be higher than 60 ℃ to avoid serious scaling, the temperature difference at the high temperature end should not be less than 20 ℃, and the temperature difference at the low temperature end should not be less than 5 ℃. When performing heat exchange between two process streams, the temperature difference at the low temperature end should not be less than 20 ℃. When a multi-tube pass single shell pass heat exchanger is used and water is used as the coolant, the outlet temperature of the cooling water should not be higher than the temperature of the process fluid. The inlet temperature of the coolant should be higher than the freezing point of the easy-to-freeze components in the process stream. When condensing materials with inert gas, the coolant outlet temperature should be lower than the dew point of the process materials.

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