This chemistry permits ethylene glycol to act as an intermediate in a wide range of reactions. Due to possible slush creation, ethylene glycol and water solutions should not be used in conditions close to freezing points. The mass of the liquid at installation can be calculated as, minst = ρinst Vinst (1), minst = mass of liquid at installation (kg), Vinst = liquid volume at installation (m3), Mass of the liquid in the system during operation will be same as the mass in system during installation, minst = mop (2), (2) can be modified to calculate liquid operation volume as, Vop = minst / ρop (2b), The required expansion volume to avoid pressure can be calculated as, ΔV = Vop - Vinst (3), ΔV = (ρinst / ρop - 1) Vinst (4), Specific Heat - cp - of ethylene glycol based water solutions at various temperatures are indicated below. 0000331244 00000 n
The specific gravity of ethylene glycol based water solutions are increased compared with specific gravity of clean water. trailer
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Its most common use is as an automotive antifreeze. 0000008674 00000 n
Ethylene glycol should be avoided if there is a slightest chance of leakage to potable water or food processing systems. Cookies are only used in the browser to improve user experience. The density of ethylene glycol is higher than water - check the specific gravity (SG) table above, so the net impact on the heat transport capacity is reduced. 0000350731 00000 n
Ethylene Glycol – The Versatile Performer From the table above we see that the density of the solution at installation temperature can be as high as 1090 kg/m3 - and the medium density at operation temperature can be as low as 1042 kg/m3. 0000346310 00000 n
ethylene glycol as an antifreeze is based on its ability to lower the freezing point when mixed with water. 0000355821 00000 n
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Professor of Chemistry, Whitman College, Walla Walla, Washington. 1801 0 obj
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For full table with Boiling Points - rotate the screen! Its most common use is as an automotive antifreeze. The hydroxyl groups on glycols undergo the usual alcohol chemistry, giving a wide variety of possible derivatives. Specific heat, viscosity and specific weight of a water and ethylene glycol solution vary significantly with the percent of ethylene glycol and the temperature of the fluid. �"25�B��� Omissions? 0000264493 00000 n
If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Distilled or deionized water should be used for ethylene glycol solutions. Especially significant is resin formation, including the condensation with dimethyl terephthalate or terephthalic acid resulting in … Note! The physical properties of ethylene glycol-water mixtures are therefore extremely important. Automobile antifreeze solutions should not be used in HVAC systems because they contain silicates that may cause fouling. 0000002466 00000 n
City water may be treated with chlorine which is corrosive. The specific heat of ethylene glycol based water solutions are less than the specific heat of clean water. The name ethylene glycol refers literally to “the glycol made from ethylene.” Its systematic name is ethane-1,2-diol. The installation temperature of the system is down to 0oC and the maximum medium operation temperature is 80oC. hެVkL�g>�����EPڊ\l� "����]� In addition to its use in antifreeze, ethylene glycol is used as an ingredient in hydraulic fluids, printing inks, and paint solvents. Specific gravity at the same conditions is 1.077. �%3��m�B�mDz? 0000000956 00000 n
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Specific gravity - SG - of ethylene glycol based water solutions at various temperatures are indicated below. Some of our calculators and applications let you save application data to your local computer.