freeze point, viscosity, certain gravity and particular heat of ethylene glycol based heat-transfer fluids, or brines
Ethylene Glycol based water remedies are usual in heat-transfer applications where the temperature in the warmth transfer liquid can be below 32oF (0oC). Ethylene glycol is also commonly supplied in heater applications the temporarily may not be operated (cold) in surroundings with freezing conditions - such as cars and machines v water cooled engines.
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Ethylene Glycol is the most typical antifreeze liquid for typical heating and also cooling applications. Ethylene glycol must be avoided if there is a slightest chance of leakage to drinkable water or food processing systems. Instead solutions based on propylene glycol are typically used.
Specific heat, viscosity and certain weight of a water and also ethylene glycol systems vary significantly with the percent the ethylene glycol and also the temperature that the fluid. Properties different so much from clean water that heat transfer solution with ethylene glycol have to be calculated thoroughly for really temperature and solution.
Freezing suggest of Ethylene Glycol based Water Solutions
Freezing points of ethylene glycol based water remedies at assorted temperatures are suggested below
Due to possible slush creation, ethylene glycol and also water solutions have to not be provided in conditions close to freezing points.
Dynamic Viscosity of Ethylene Glycol based Water Solutions
Dynamic viscosity - μ- that ethylene glycol based water options at assorted temperatures are shown below
below freezing point over boiling suggest
Note! The dynamic viscosity of an ethylene glycol based water equipment is increased compared with the dynamic viscosity of clean water. Together a an effect the head loss (pressure loss) in the a piping system with ethylene glycol is increased contrasted to clean water.
Specific heaviness of Ethylene Glycol based Water Solutions
Specific gravity - SG - the ethylene glycol based water services at miscellaneous temperatures are shown below
below freezing point over boiling point
Note! The specific gravity that ethylene glycol based water solutions are increased contrasted with particular gravity of clean water.
Densities of Ethylene Glycol based Water Solutions
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A furnace with fluid volume 0.8 m3 is freeze defended with 50% (by mass, mass fraction 0.5) ethylene glycol. The environment temperature of the mechanism is down to 0oC and also the maximum tool operation temperature is 80oC.
From the table above we watch that the density of the equipment at surroundings temperature deserve to be as high as 1090 kg/m3 - and also the medium density at procedure temperature deserve to be as low together 1042 kg/m3.
The mass of the fluid at installation can be calculated as
minst = ρinst Vinst (1)
= (1090 kg/m3) (0.8 m3)
= 872 kg
minst = massive of liquid at environment (kg)
ρinst = density at installation (kg/m3)
Vinst = fluid volume at installation (m3)
Mass the the fluid in the system throughout operation will be very same as the massive in system during installation
minst = mop (2)
= ρop Vop
mop = fixed of fluid at procedure (kg)
ρop = density atoperation (kg/m3)
Vop = fluid volume atoperation (m3)
(2) can be modified to calculate liquid procedure volume as
Vop = minst / ρop (2b)
= (872 kg) / (1042 kg/m3)
= 0.837 m3
The required growth volume to prevent pressure can be calculated as
ΔV = Vop -Vinst (3)
= (0.837 m3) - (0.8 m3)
= 0.037 m3
= 37 liter
ΔV = growth volume (m3)
Expansion volume can be calculate as
ΔV = (ρinst / ρop - 1) Vinst (4)
Specific heat of Ethylene Glycol based Water Solutions
Specific warm - cp - of ethylene glycol based water remedies at assorted temperatures are suggested below
Turn the display screen to the totality table.
Note! The specific heat of ethylene glycol based water remedies are less 보다 the certain heat of clean water. For a heat transfer mechanism with ethylene glycol the circulated volume must be increased contrasted to a system only through water.
In a 50% solution with operational temperatures over 36 the the particular heat volume is reduced with approximately 20%. The diminished heat capacity must be compensated through circulating more fluid.
Note! The density of ethylene glycol is higher than water - check the certain gravity (SG) table above, for this reason the net impact on the warmth transport volume is reduced. Example - the details heat of an ethylene glycol water solution 50% / 50% is 0.815 in ~ 80 of (26.7 oC). Specific gravity at the same problems is 1.077. The net affect can be estimated to 0.815 * 1.077 = 0.877.
Automobile antifreeze solutions have to not be provided in HVAC systems since they contain silicates that may cause fouling. Silicates in auto antifreeze are offered to protect aluminum engine parts.
Note! Distilled or deionized water should be offered for ethylene glycol solutions. City water may be treated with chlorine i beg your pardon is corrosive.
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Systems for automatic makeup water should not be used because a leakage would contaminate the environment and dilute the antifreeze defense of the system.
Boiling clues Ethylene Glycol Solutions
For complete table v Boiling points - revolve the screen!