CHILLED WATER CHILLING SYSTEM
Chilled water units can be a lower Capital cost option to cool milk,
Chilled water requires either a large refrigeration system to cool the milk directly during milking (direct online cooling) or a smaller capacity unit to cool down a large volume of water before milking (around 25000
Pre-cooling a body of water and running a unit during milking is also an option that offers a compromise between the above options.
We have a range of sizes available to suit whatever your requirements are however we would need to confirm the capacity of your power supply to ensure a direct online unit won’t overload your system and require a very costly electrical upgrade.
Our chilled water units can be run on Glycol if required to give a cooler temp into the Plate Cooler.
While Glycol can give you a colder temp, it has a lower specific heat capacity than water, meaning it removes less heat than water for the same volume.
We are not fans of Glycol for several reasons and with 30 years of experience, we have seen the same problems on a regular basis.
Glycol concentration needs to be monitored. If the ratio of Glycol to water changes, this alters the freezing point of the mix which can lead to freezing up of the heat exchangers, in most cases causing damage beyond repair. This will not happen in the short term, but over the longer term, maintenance can be overlooked leading to issues.
The common cause of this is after a period of running, the solution level drops and gets top up either through evaporation or small leaks developing in the system. The solution is often topped up with water and can change the freezing point from -5deg to say-1 deg, with a system set to operate at -3°C, the system will fail.
With Glycol operating below 0°C, as it passes through the plate cooler with the milk, if there is a hold-up or reduced flow with the milk, the milk will freeze in the plate cooler, more than likely damaging the plates.
In a dairy application, as it is so close to the milk, the potential of contamination has much more serious consequences (should you get a leak between plate cooler plates) than chilled water or ice-bank system.
With Glycol there is an extra cost for the Glycol, this can be a substantial cost, which we believe would be better put toward larger chilled water, or one of our ice-bank systems which will give you payback in energy savings.
Should you have a Glycol (chemical) spill on site, this can be a costly exercise to clean up and there is the added cost to replace the lost fluid.