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Microbrewery Glycol Cooling System Temperature Control

For microbrewery construction, a well-designed glycol cooling system is important for both wort cooling and fermentation. A complete glycol system includes a glycol tank, cooler, pump and delivery piping. When designing a microbrewery, we usually have two smaller chillers instead of one large chiller, mainly because if one of the chillers goes out and takes time to fix, the other chiller can still maintain approximately the existing fermentation, thus protecting the beer.

Microbrewery Glycol Cooling System Temperature Control
Microbrewery Glycol Cooling System Temperature Control

Many customers are not very clear about the working process of 2 chillers when talking about their microbrewery design, here we explain this control process as follows.

Let’s assume a glycol system including 1x2500L GWT, 2x5hp chillers, 1xGWT pump, 1 cellar control panel. So let’s start.

1x2500L GWT has two glycol outlets and two glycol return ports.
Chiller 1 is connected to glycol outlet 1 and glycol return port 1.
Chiller 2 is connected to glycol outlet 2 and glycol return port 2.
Chiller 1 has a controller on the control panel (with two operating conditions, automatic mode switch/manual mode switch).
Chiller 2 has a controller on the control panel (with two operating conditions, automatic mode switch/manual mode switch).
PS: Automatic mode switch. Indicates that the chiller will be controlled automatically (on/off).
Manual mode switch. Indicates that the chiller will be controlled manually (on/off).

Auto Control

For example, we set GWT to 15F on the control panel.
We switch the working mode of both Chiller1 and Chiller2 to “Auto”.
When the actual temperature of GWT is higher than 15F (measured by temperature probe)
The controller will first command the glycol pump to recirculate the fluid to Chiller 1 and 2, after the fluid reaches Chiller 1 and 2.
Chillers 1 and 2 will work automatically to cool the liquid, the liquid will keep circulating and finally reach 15F, then all machines will stop automatically.

Manual control

We can also just let chiller 1 turn on the “Auto” switch and let chiller 2 turn on the “Manual” switch.
Then chiller 2 will not be controlled by the control panel during the whole process.
Only chiller 1 is involved in completing the above cooling process.

If you have more questions about setting up a microbrewery, please feel free to contact us.