Judge the inlet and outlet lines
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The existing fan does not have any markings indicating the inlet and outlet water points; it is not clear whether the cooling water flows into the bearing box of the coupling first or into the bearing box on the impeller side
My opinion is: cool the bearing housing on the coupling side with the lower temperature first, and then the bearing housing on the impeller side with the higher temperature. It’s just my personal opinion\ud83d\ude0a
Regardless of the direction, just follow the principle of entering at low levels and exiting at high levels.