What is Milk chilling and bulk milk coolers?
Milk chilling is the rapid cooling of raw milk after milking to slow bacterial growth before it reaches a processing plant. Bulk milk coolers at farms and village chilling centers hold milk in insulated, refrigerated tanks, which makes them a distributed refrigeration and power load that dairies often cannot see.
What it is
Raw milk leaves the animal warm, and bacteria multiply quickly at that temperature. Chilling brings it down fast and holds it cold until a tanker collects it. Quality programs and buyers set the target temperatures and time limits, so operators should follow the rule that applies to their supply chain.
Bulk milk coolers are stainless steel tanks with a refrigeration unit, an agitator and a temperature controller. Larger chilling centers may use plate chillers or ice bank systems that build ice during off-peak hours and release cooling during collection.
In many dairy supply chains, especially in India, hundreds of coolers sit at village collection points with unreliable grid power and diesel backup. Each one affects both milk quality and the cost of cooling.
Who it applies to / where it is used
Bulk milk coolers are used by dairy farms, cooperatives, village collection centers and chilling centers that feed processing plants. Dairies with procurement networks carry the quality risk of every cooler, even when they do not operate them directly.
How it is measured / what evidence it needs
Evidence for chilling is a continuous temperature record from fill to collection, alongside the energy it took to get there.
- Milk temperature from the start of fill to tanker collection
- Time to reach target temperature after each fill
- Compressor run time and electrical energy per liter chilled
- Power source: grid, diesel generator or solar
- Door, agitator and power failure events
How Aqueduct helps
Aqueduct connects distributed coolers to one portfolio view, so procurement and quality teams see every site against the same baseline.
- aQ Core takes temperature and power readings from coolers over LoRaWAN, LTE or Wi-Fi gateways
- aQ EnergySmart compares energy per liter chilled across centers
- Alerts flag slow pull-down or rising temperature so a technician can be routed through the customer's CMMS
- aQ PredictIQ watches compressor behavior for early signs of failure