I am wondering if someone can please advice on how to improve the effectiveness of a cooling system I am using. I am trying to cool a substance using an 8m long conveyor belt with 3 air conditioning units with two outlets on each unit blowing down on the material. The current set up I have tried has had the a/c units equally spaced out along the belt. I am now considering either grouping all the units together at either the start or end of the belt and I am not sure what will be more effective. Delta T will be greatest at the beginning but the ambient air temperature may do a lot of the work for me and I should then possibly concentrate the a/c units at the end of the belt or blast it at the start? Material temperature = 45 degree Ambient temperature inside room = 20 degree a/c set to lowest setting = 1 degree material spread to a thickness around 10mm conveyor speed - 0.072 m/s Any thoughts?