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GLYCOL SYSTEMS
Glycol Concentration
The system must be filled with water and the appropriate amount of glycol (either ethylene or propylene)
to protect against winter freeze-up. To achieve the approximate glycol concentration, it is necessary to
know the total system volume. This consists of the sum of the fluid cooler volume, the evaporator unit
volume and the volume of the interconnecting piping.
The following tables can be used for arriving at an approximate system volume. After installation,
the glycol percentage should be checked. The glycol percentage should also be checked at regular
intervals to ensure freeze protection.
Internal (Fluid) Volume
Fluid Cooler Internal Volume
Information regarding fluid cooler (or often referred to as a “dry cooler”) operation and internal volume,
the volume of the interconnecting piping and the freezing point of aqueous solutions can be found in
the individual Fluid Cooler Operation and Maintenance Manuals which should be referred to for more
complete details.
Brazed-Plate Condensers
Data Aire water cooled units use brazed-plate condensers as a standard. Brazed-plate condensers
are constructed of plates brazed together to form an assembly of separate channels. Refrigerant is
confined to the space between the welded plates and is exposed to gaskets only at the ports. Such
condensers have a higher range of capacity.
The stainless-steel plates are configured with a wave pattern, which results in high turbulence and low
susceptibility to fouling. Because of the compact design, these condensers require a low refrigerant
charge. The construction of brazed units does not allow mechanical cleaning, and internal leaks usually
cannot be repaired. Thus, it is recommended to use closed-loop cooling systems with good filtration or
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