Closed systems usually use circulating heating, and the heat transfer oil is circulated in a closed system without contact with air. The open system directly heats the heat transfer oil through an external heat source, and the heat transfer oil is in contact with the air and is easy to oxidize.
Since the heat transfer oil in the closed system does not come into contact with the air, it can effectively prevent the oxidation and deterioration of the heat transfer oil. The heat transfer oil in the open system is in contact with the air for a long time in a large area, which is easy to oxidize to form organic acids, which further promotes the polymerization reaction of the heat transfer oil and condensation into cement, which increases the viscosity, resulting in the slowing down of the flow rate of the heat transfer oil, the deterioration of the heat transfer effect, and the deterioration of the heat transfer oil and the shortening of the service life of the heat transfer oil.
Closed systems are typically more efficient at heat transfer than open systems. In a closed-type system, the heat transfer oil is circulated and heated, resulting in a more uniform heat transfer and a higher heat transfer efficiency. In an open system, the heat transfer efficiency is relatively low due to the direct heating of the heat transfer oil from an external heat source.
In summary, the main differences between closed and open systems are in terms of system design, oxidation control, and heat transfer efficiency. In practical applications, it is necessary to choose the right system type according to the specific needs and production conditions, and the right heat transfer oil should be selected for different systems, so as to achieve better use results.