When a large dairy's chiller plant failed and needed replacing, their refrigeration contractor called Aggreko to design and install a rental temperature control package to allow milk production to continue.
For health and safety reasons, the site's process cooling system used ice water through heat exchangers to cool the milk to its required temperature of between 3-4°C.
We therefore had to find a way to deliver ice water at 1°C across the entire site: too warm and the milk would spoil, too cold and the water would freeze.
Aggreko’s technical team worked fast to design a solution that could tie into the site’s water cooling process. We installed a number of 800 kW chillers providing a set point of 1°C. This was linked into a three way valve which then linked to a heat exchanger. The water from the dairy’s plant went into the heat exchanger and was cooled down to the exact required temperature by coolant from our chiller.
As it was key to deliver a constant water temperature of +/- 0.3°C, we installed a temperature gauge to read the temperature of the water leaving the heat exchanger.
When the water temperature began to rise, the three way valve opened allowing more coolant from the chiller into the heat exchanger to cool it back down. When the water temperature began to drop, the three way valve closed slightly, allowing warmer fluid from the heat exchanger to feed around the three-way value and back in again, without being cooled by the chiller.
The temperature sensors and three way value were extremely sensitive and precise to ensure accuracy for this critical process.
As the dairy operated 24/7 it demanded a robust chilling system that could support the whole site and ensure production levels could be met.
Aggreko’s temperature control package ensured the dairy could continue production whilst the chiller plant was repaired and bought back on line.
We saved the dairy from huge losses in production and the financial implications that this would have brought.