Synthetic refrigerants, such as hydrofluorocarbons, are currently being phased out by the European Union.
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According to the revised F-gas Regulation recently signed into EU law, all new self-contained refrigeration equipment, with the exception of chillers, installed from January 2025 on must use refrigerants with a global warming potential (GWP) value of less than 150. Existing systems may still be used and repaired for the remainder of their economic life.
However, effective from 2032, refrigeration systems using refrigerants with a GWP value above 750, apart from chillers, can no longer be refilled during maintenance and service.
From 2027, further restrictions on the maximum amount of synthetic refrigerants that can be placed in the EU market will be introduced, capping the amount at about 20 million tonnes CO2 equivalent per year. This will increase the price of synthetic refrigerants, making equipment, such as milk cooling tanks with outdated technology, more costly to purchase and operate. This will create an incentive to invest in technology that is more modern and environmentally sustainable.
Early refrigerants back in favor
The phasing out of harmful refrigerants is a process that has been ongoing for nearly 40 years. During the 1980s, the first evidence of holes in the ozone layer started to emerge. Since then, successive regulatory regimes have heralded new product generations of refrigerants, each less harmful than the previous one.
Early refrigeration systems, back in the 1800s, used natural refrigerants such as CO2, ammonia, or hydrocarbons. However, these refrigerants weren’t practical to use with the manufacturing technology and safety practices prevalent at the time. During the 1930s, Freon was introduced, providing effective refrigeration at low pressure while also improving safety.
Freon started to be phased out after the ratification of the Montreal Protocol in the 1980s, due to its high ozone depletion potential. Since then, there has been a shift of focus back toward natural refrigerants. CO2 has a GWP of 1 and an ozone depletion potential of 0, making its environmental impact neutral.
CO2: An effective refrigerant
The first milk cooling tank in the European market to use CO2 as a refrigerant in standard cooling systems of the direct-expansion cooling type has been introduced by Wedholms. The tank is compatible with the revised F-gas Regulation that will be mandatory in the European Union beginning in January 2025.
The DFC 953 range of milk cooling tanks is available for robotic milking with one to eight robots, with a capacity ranging from 3,200–30,000 liters.
“Refrigerants that are environmentally friendly are being introduced across the board, and milk cooling tanks are no exception,” says Stefan Gavelin, managing director of Wedholms. “Refrigeration is an essential process in the farming and dairy industries, and we need to use processes that work in harmony with the natural environment that we depend on.”
CO2 is a very effective refrigerant. Its unique properties, both as a vapor and a fluid, ensure high energy efficiency, reducing operating costs significantly. This also enables the use of small components and small-diameter lines, minimizing the footprint of components and reducing the cost of parts and repairs.
The high energy content of compressed CO2 produces heat as a byproduct of the process. This is recovered by the DFC 953 system and used to provide hot water for auxiliary systems.
Direct expansion cooling is the most common type of cooling system. It works on the principle that the temperature of the gas is lowered when the pressure is reduced, and the gas expands. The cold gas absorbs heat from inside an enclosed space and releases its heat content to the outside.
“We are coming full circle, with natural refrigerants once again becoming the norm. CO2 refrigeration requires a high operating pressure, but thanks to technological advancements, such systems have, over the last decade, become viable for both commercial and industrial use in many different applications,” says Gavelin.
“At Wedholms, we have chosen to work with CO2 as refrigerant,” he says. “Ammonia is toxic as well as corrosive; hydrocarbons, such as propane, are flammable. CO2 has none of these disadvantages. In addition, it is readily available in large quantities and at low cost.”
Compatible with all milking robots
The compressor of the DFC 953 range of milk cooling tanks operates with frequency control, running at exactly the speed required by the process. A small batch with 20 liters of milk is refrigerated to exactly the right temperature just as effectively as larger batches of 200 liters. This prevents ice formation in the tank.
The DFC 953 range of milk cooling tanks is compatible with all robotic milking machines. A variety of adapter kits is available.
The control system provides a wide range of options for efficient agitation and temperature control as well as advanced alarm functions. A home consumption button allows users to obtain milk.
Thorough cleaning is provided by a spray head designed to eliminate calcium deposits and bacteria growth across the entire inside of the tank with a powerful water jet.
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