Traditional cooling medium defects
Water is a type of cooling medium. Water has been chosen as a cooling medium for a long time, mainly because of its safety and easy accessibility. However, the inherent defects of water, such as low boiling point, icing, corrosion, scale, etc., make it unable to meet the needs of modern engine development. In the history of the development of the automotive industry for more than a hundred years, it has undergone many technological changes, but the cooling medium has never been fundamentally changed, and it is always inseparable from water. In the past, people's understanding of the internal working state of the cooling system was vague. When using aqueous coolant, the high temperature and heat exchange generated during cylinder operation were not due to the low boiling point of water and the fact that the generated water vapor layer hindered the heat conduction. Come out, the engine works in an overheated state, resulting in pre-combustion, knocking, engine performance degradation, increased fuel consumption, and increased failure rate. Many automakers have added pressure devices to the cooling system to alleviate the problem of overheating “opening the pot”, which not only increases the manufacturing cost, but also does not solve the problem fundamentally. All engines will be exposed to this hazard as long as they use an aqueous cooling medium. Moreover, scale and water rust are generated in the cooling system pipeline, and the system works under high pressure, so that the life of the cooling system is greatly shortened.