The main function of a glycol system, also known as a glycol cooling system or glycol chiller, is to maintain the temperature of draft beer as it is dispensed from kegs to tap faucets, especially in long-draw beer systems or situations where the kegs are located at a distance from the tap faucets. The glycol system serves several important functions:

 Temperature Control: The primary function of a glycol system is to control and maintain the desired temperature of the beer throughout the dispensing process. The glycol mixture, typically a blend of propylene glycol and water, acts as a coolant.

Heat Transfer: The glycol mixture has excellent heat transfer properties, allowing it to efficiently absorb the heat generated by the beer as it travels through the lines. This prevents any temperature fluctuations and ensures that the beer remains consistently chilled from the keg to the tap faucet.

 Cooling Beer Lines: The glycol system circulates the chilled glycol mixture through insulated beer lines. As the glycol passes through the lines, it cools the beer lines, glycol beer system maintaining a constant temperature and preventing any warming of the beer due to ambient conditions. This helps preserve the quality and freshness of the beer during dispensing.

4. Prevention of Foaming: Keeping the beer lines and faucets cold helps prevent excessive foaming when the beer is poured into a glass. Cold beer lines and faucets help maintain the carbonation level and minimize the release of carbon dioxide, resulting in a smoother and more controlled pour.

5. Long-Distance Dispensing: In long-draw systems or setups where the kegs are located far away from the tap faucets, a glycol system is essential for maintaining the beer's temperature. By using insulated beer lines and cooling jackets, if necessary, the glycol system ensures that the beer remains cold and fresh even over extended distances.

6. Temperature Stability: Glycol systems provide precise temperature control, maintaining a stable and consistent temperature throughout the dispensing process. This stability is crucial for preserving the flavor, aroma, and overall quality of the beer, ensuring that it is served to customers in the best possible condition.

Overall, the function of a glycol system is to regulate and control the temperature of draft beer, providing a consistent and enjoyable drinking experience for customers. By utilizing the cooling properties of the glycol mixture and properly insulated lines, the system helps maintain the beer's freshness, carbonation, and taste from the keg to the tap faucet.