Why CHW line always connect in bottom side of AHU

Greetings from Dynamic HVAC,
I am going to share about why do we use CHW inlet line in bottom side of AHU,CSU etc. When we connect CHW inlet line in upside so here we face a problem that cooling not properly happen due to heat is not exchanging in cooling coil because of water is not full in line there is air bubble. This is the reason we connect CHW inlet line in bottom side.
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