Heat exchange in heat exchangers
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Question: For a soft water heat exchanger, is it better to have high inlet and low outlet, or low inlet and high outlet? Additional note: The heat exchange medium is circulating water and soft water; the outlet of the heat exchanger is connected to a pump that sends the fluid to another reaction vessel, while the inlet receives fluid returning from that reaction vessel ； Soft water is supplied at the outlet of the heat exchanger, which is also the inlet of the pump; excess water at the inlet of the heat exchanger is directed to a higher point for drainage.
Liquid feed is generally supplied from low to high, which facilitates heat exchange and also makes it easier to exhaust air from the heat exchanger. If feeding from top to bottom, the vaporization of the liquid will reduce the thermal conductivity, affecting the heat transfer efficiency
In heat exchangers, generally, the hot source has high inlet and low outlet, while the cold source has low inlet and high outlet.
Personally, I think it’s better for pipe routines to have low input and high output