The antifreeze properties
The most often encountered in connection with antifreeze liquid cooling system for motor vehicles, and countless myths circulating about them. Which one to choose? When to replace? How many degrees is good? These are the questions we try to answer.
The engine generated excess heat is typically an active liquid cooling system to deliver, man a little, the energy used is only 30-40% of the kinetic energy is utilized as a. Heat transfer point of view, we would be best to clean water, whereas, the maximum heat capacity, so a given amount of water can supply most of the energy. However, there is one very serious drawback, namely that 0 During freeze ° C, and thus cause irreversible damage to the fridge. The most commonly a glycol-based antifreeze meet the market. To protect the refrigerant mixed corrosion inhibitors are marketed, actually this is the crucial difference between the products. A number of standards exist in the antifreeze they regulate a large number of parameters.
A key priority is the antifreeze properties. When shopping for the most important, Always read the label carefully, that purchased freeze concentrated to, diluted or already are dealing with. The label of a commercially available anti-freeze fluids usually meet with a table, which shows for different mixing ratios, how much will the freezing point of the coolant. Concentrated antifreeze are dealing, has 1:1 dilution is approximately. -36˘ ° C. More precisely,, this value is the initial crystallization temperature, Whereas, according to the standard definition of this is done, that the liquid is continuously cooled, while watching, occurs when the first appearance of solid crystals. Most often, however, check the anti-freeze protection for the determination of the refractive index, for the gas stations can be found in "Pervert", the hand-held refractometer. It is not quite accurate, but good results can approximate. For a given ethylene glycol / water ratio of the refractive index is constant and the characteristic value of the freezing point. Other components of the coolant contained in, However, somewhat distort the results, it is useful in practice. The handheld devices are not usually in the refractive index, but once the freezing point is given as a result, ethylene glycol-water mixture are already on the market were calibrated. However, there are propylene glycol, ethanol, calibrated instruments other substances, of course they are going to give false results, so always read the instructions for this instrument.
Antarctica -40 and -60 Temperature range ° C characteristic, even one day in July 1983 -89 ° C to below the temperature. If we go there by car, not a good solution, that -72 ° C in the refrigerator filled with antifreeze, because there is no such. At best, these products are half and half -36 ° C frost protection promise, which in turn must be true also, but not in a concentrated -72, although according to the established practice of the label many times this value in. Ethylene glycol freezing point -13 °C, However, strong hydrogen bonding of water molecules bound to prevent the formation of crystals, diluting the initial crystallization temperature starts to decrease. The lowest freezing point is about. 70% antifreeze and 30% water mixture is achieved, which -68 Around C is. Concentrated antifreeze liquid contained within the already small amount of water, Due to other substances and used about. -21 °C-on fagynak. The characteristic curve diagram of propylene glycol-based fluid is shown in red, This is a concentrated -58 ° C for frost protection, continuously diluted freezing point, while not increasing linearly. The cost of higher, de mivel a propylene glycol German toxikus, food industry such as, solar collectors is often used.
As mentioned at the beginning, In addition to the freezing point of the corrosion protection, which is the most important feature of the coolant in here and I'll see the biggest differences between the various configurations. Traditionally antifreeze fluids is achieved by the corrosion protection, it contains inhibitors that form a protective layer on the surface, thus excluded it from the corrosive water and glycol,. Many of these inorganic oxide compounds, silicates, borátok, phosphates. Their content in the design of the protective film is continuously decreasing, eventually you run out of fluid, therefore it is advisable to replace at least 3 year, even, if adequate frost protection. Such is the Samatan blue frost resistance is.
The modern anti-freeze fluids, mint in Glicosam piros, products manufactured or purple, OAT are known technology. Complies with currently recommended by most car manufacturers requirements, among which the most famous Volkswagen Group has become standard G12. Ezek nirvána, amin, nitrate and phosphate products, corrosion resistance and organic acids, given neutralized salts produced carboxylates. The most significant difference, it does not form a protective layer, it reacts with the protected metal corrosion spots. As a result, better thermal conduction parameters, and longer service life, these fluids. Is much more resistant to thermal degradation, relevant priority reaching extremely high temperatures can be solar systems, and in the case of hot aluminum surfaces. Recommended replacement 5 year, engines use aluminum alloys is highly recommended. The G13 specification changes made so far, these liquids contain some inhibitor containing silicate (kb. 400-500 mg/l) is, protective effect of the organic acid salt to be completed. In addition to all the glycol glycerin is included, thus reducing the coolant “ecological footprint”.