Lista zgłoszonych artykułów

Modern car engines are achieving increasingly higher power. This is achieved by improving technology and using increasingly better materials that can withstand the increasing stresses and forces occurring in the engine. One possibility is also to increase the engine\'s operating temperature, which, however, causes a problem with dissipating a significant amount of heat. The condition for the proper operation of an internal combustion engine is the dissipation of heat by the cooling system. It is estimated that this is up to 35% of the heat generated in the combustion chamber, which means that the cooling system must dissipate an amount of heat comparable to the useful power generated by the engine. Two types of cooling systems are commonly used. The direct system consists of extensive heat exchange surfaces and does not require the use of a cooling liquid, but manufacturers are moving away from using this type of system due to the increasingly higher power obtained from a single cylinder displacement. The more commonly used cooling system today is an indirect system filled with a mixture called coolant. Water was the first coolant used, which was replaced by aqueous solutions of glycols and alcohols. The presentation will present a comparison of the properties of water and an aqueous solution of ethylene glycol, as well as the advantages and disadvantages of each of these solutions based on tests of the properties of the liquid at elevated engine operating temperatures.