The “DIB” method (Direct Ice Bank) or otherwise known as the glycol cooling tank operates under the same principle as the DX system. The exception instead of using refrigerant gas which passes through the cooling plates (evaporator), a glycol / water mixture is circulated via water pumps instead. This glycol mixture is pre-cooled firstly using a refrigeration unit before entering the evaporator, thus this type of cooling method is known as secondary refrigeration cooling.
The horizontal construction is space saving and the efficient evaporator ensures quick trouble free milk cooling, coupled with the agitator the milk is evenly stirred ensuring optimal heat exchange and prevention of freezing.The agitator doubles to expedite the efficient cleaning via the rotojet cleaning powerball. All internal surfaces are smooth and thus are no bacteria traps.
High quality stainless steel AISI 304.
Insulation is compact (CFC Free) polyurethane
•Dolphin control system – electronic control system for control of cooling, washing and agitation.
•The Dolphin control system also has an alarm system to alerts of any irregularities.
•Refrigeration glycol chiller units – sized and built to meet Australian standards of cooling and also to meet harsh climatic conditions.
•High pressure cleaning system from a dynamic spray ball integrated in the agitator of the vat.
•Other usual standard components on a Packo vat include: adjustable legs, non return valve
•Highly efficient laser welded evaporator.
•Refer to vat features for more detail.
What is a “Glycol Cooling” (DIB) Packo milk tank?
A Glycol cooling tank other wise known as a “DIB” model works under the same principle as a direct expansion (DX) system. The cooling plates which normally carry the refrigerant gas on a DX system instead are used to carry a water / glycol mixture. The water / glycol mixture is firstly pre-cooled down to a super low temperature using a refrigeration compressor or a dedicated on call chiller system. A small storage vessel that is insulated holds the cooled water / glycol mixture until it is required, upon call water pumps circulate the mixture through the cooling plates (evaporator) which removes heat from the milk. The warm water / glycol returns back to the chiller unit for instantaneous refrigeration and holding again in the glycol storage vessel. This form of cooling is known as secondary refrigeration, a refrigeration compressor is still used but instead cools the glycol which again is used to cool the milk.
Uses for “Glycol Cooling” (DIB) Packo milk tanks-
The DIB / Glycol system is ideal for the large volume milk producer or the intermediate producer requiring the advantages of DIB cooling.
Unlike direct expansion (DX) systems, glycol on call chiller compressors are sized for milk flow from the platform instead of milk tank volume like the DX system. This means that the maximum flow rate of incoming milk is what the system can cool and is capable of achieving.
In most cases a secondary plate cooler or heat exchanger is fitted in line after the first ground water plate cooler. Milk enters the secondary plate cooler which also has the glycol mixture passing through the plates, dependant on size of chiller selected, the incoming milk can be reduced in temperature and can enter the tank at 4 degrees.
The evaporators of the milk cooling tank use the glycol mixture via another pump to maintain milk temperature or to further reduce temperature to the 4 degree cut off in warmer months. The secondary plate cooler is not required but is the most effective and efficient means when coupled with a DIB milk cooling tank using an on call glycol chiller compressor.
The ultimate advantage is that milk can enter the tank already cold and at set point temperatures. The quality of the milk is at first class levels with minimum bacteria. The other advantage is that be it one drop of milk or a whole tank full, milk is cooled without issues of freezing or over running of the compressors. Thus this system is perfect for large volume milk producers.
Why should I chose a Packo “Glycol Cooling” (DIB) milk tank?-
Packo Inox is the world’s oldest manufacturer of milk cooling tanks. Countless hours and years of refinement, testing and development is the product you see today which sits behind the Packo name plate. Laser welded evaporators unlike competitors spot welded plates is the first sign that Packo is a technological leader in the industry. Superior wash systems and computerized control systems, designed not only for advancement but also ease of use puts Packo ahead of the rest.
We have a saying at Dairy-Tech Refrigeration, “If you have to clean a Packo tank manually, then you simply have a problem”. And it is as simple as that, a Packo tank leads all others in the field of not only cooling but also washing technology.
Others have tried but there is only one type of milk cooling tank that is as good as a Packo tank, and that is- “A Packo Tank”
On call glycol chiller systems used for “Glycol Cooling” Packo milk tanks-
Dairy-Tech Refrigeration uses the “Fluid Chiller Australia” on call chiller system on all installations. Based in Melbourne, “Fluid Chillers” are an Australian made and operated company, using components that are available Australia wide through refrigeration wholesalers ensures that spare parts and reliability is maintained.
The on call chiller system is a stand alone arrangement which means less add on components when installing on site. The glycol storage cylinder, pumps and accessories are all part of the complete stand alone package. In some instances pump stations or separate storage cylinders may be used, but generally the unit is complete.
The on call chiller system has the major advantage where the system can be used to not only cool the milk tank, but also pre-cooling of the milk through plate coolers and other components. Things like calf milk tanks and even a second milk tank. Where a DX system is limited to what it is connected too, a chiller system is not. A chiller system can be used as your total refrigeration and pre cooling system for all tanks and plate coolers.
Add on features like “heat recovery” are fitted on the chiller as an option before delivery to farm. Two valves sit on the chiller wall ready to connect for future usage. All refrigeration heat exchangers and other components are fitted and ready for that time when heat recovery gets connected. The system can run without heat recovery usage un affected allowing the farmer to connect when time and money allows. Heat recovery is the means where the heat generated in normal compressor usage, is captured and used to heat storage water raising the temperature to approx +/- 65 degrees. This heated water is then used to fill the main dairy hot water systems thus saving money on heating costs using normal electrical heating elements.
“The Packo Glycol Cooling (DIB) milk cooling tank is the answer for the large producer”
For quotes regarding complete installed packages contact ph 03 5662 3277.