After two minutes of starting the system, the seawater pumped in will turn into liquid ice. Depending on needs, users can adjust the density of the ice.
Scientists from the Center for High-Tech Development, Vietnam Academy of Science and Technology announced on November 22 that the snow ice making system has been approved by the Directorate of Fisheries, Ministry of Agriculture and Rural Development. recognized as technical progress in the agricultural sector in the fisheries sector.
This system was successfully implemented by scientists after 18 months of research and design, which can directly use sea water to form ice to preserve offshore caught seafood.
With this new technology, instead of ship owners having to buy fresh water ice from the mainland, then grind it or leave the whole plant in a cold storage compartment on board, now it is only necessary to install a system on board, pump sea water to run. through the refrigerating unit and the output will be snow ice.
The ice machine was installed for testing at Bach Long Vi fishing port. Photo: PP.
Master Le Van Luan, a member of the research team, said that the advantage of the seawater ice-making system compared to traditional freshwater ice is that this technology has created snow-shaped ice products. Morphologically, liquid ice is a mixture of small ice crystals and water, maintained in the temperature range from -6 degrees Celsius to -2 degrees Celsius. This is a transition state between liquid and solid phase, so there is pumpable from the liquid ice chamber to the storage tanks or fish storage compartments on the ship.
The time to produce liquid ice is also very short. Sea water is pumped directly into the system through the circulation tank into the cooling chamber, the output is ice product. That is, just a few seconds after starting the system, the output will be snow ice.
Although cooling is fast, the melting of liquid ice is much slower than that of freshwater ice. The density of liquid ice can also be adjusted automatically according to the needs of the user.
Because the ice is pumped from the machine to the storage chambers, the ship owner will not have to spend extra labor on threshing and spreading the stone, both reducing costs and not affecting the quality of the fish due to the sharp edges of the stone being scratched during the process. preserve.
Model of snow ice machine installed on the deck.
To save installation space, the research team designed the product in the form of discrete modules. The ice production part is located on the deck, the compressor and cooling part is located in the engine hold, the control part is located on the cabin of the ship.
The automatic control software is integrated to adjust the temperature according to each different fish compartment, users only need to adjust the temperature on the control panel. The machine also has a self-warning system when an error occurs on the screen so that fishermen know which parts need repair.
The team also set up software to calculate how many tons of ice the system has made, how much oil and electricity is consumed, for users to balance.
The product of the project’s snow ice machine currently has a capacity of 1,250 kg/24h, but the actual demand on fishing vessels every sea trip requires up to 50-60 tons of ice to preserve. To achieve this requires a machine with a larger capacity, equivalent to about 5,000 kg/24h.
To meet the actual demand, scientists at the Center for High-Tech Development are carrying out a State-level scientific mission to research and manufacture snow ice machines with a capacity of up to 10 tons/24 hours. .
Mr. Luan said that the product has the same quality as imported goods, but the price is only half that. Because the equipment is installed on ships running at sea, scientists also calculate the choice of anti-corrosion materials to ensure the durability of the product.
Diagram showing the details of the system for making snow ice from seawater.