Closed Circuit without glycol

 Using glycol has many drawbacks :

• Cost; 
• lower heat transfer coefficient so higher investment cost with larger exchange surfaces;
• higher power consumption to compensate lower heat transfer; 
• pollution as glycol is polluting liquid and freezing risk after time as the concentration may decrease during make up with water.

So, Jacir - Air Traitement has designed full ranges of closed cooling towers which do not require glycol and do not have freezing risk. Indeed, in case of power stop, the water of the secondary circuit flows downs to be basin, so that space in given in the plate heat exchanger to let the primary circuit freeze without any damages.