In a 50% solution with operational temperatures above 36 o F the specific heat capacity is decreased with approximately 20%. For a heat transfer system with ethylene glycol the circulated volume must be increased compared to a system only with water. Note! The specific heat of ethylene glycol based water solutions are less than the specific heat of clean water. Freezing point 100% ethylene glycol at atmospheric pressure is -12.8 oC (9 o F).Ethylene Glycol Water Solution Heat-Transfer Fluid - Specific Heat Ethylene Glycol Solution Specific Heat - c p - of ethylene glycol based water solutions at various temperatures are indicated below Specific Heat of Ethylene Glycol based Water Solutions
![density of water gl density of water gl](https://amazingconverter.com/images/page/density-of-water.jpg)
The required expansion volume to avoid pressure can be calculated as (2) can be modified to calculate liquid operation volume as
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Mass of the liquid in the system during operation will be same as the mass in system during installation V inst = liquid volume at installation (m 3 ) Ρ inst = density at installation (kg/m 3 ) M inst = mass of liquid at installation (kg) The mass of the liquid at installation can be calculated as įrom the table above we see that the density of the solution at installation temperature can be as high as 1090 kg/m 3 - and the medium density at operation temperature can be as low as 1042 kg/m 3. The installation temperature of the system is down to 0 oC and the maximum medium operation temperature is 80 oC. Ethylene Glycol Water Solution Heat-Transfer Fluid - Density Mass Fraction of Ethylene Glycol in SolutionĮxample - Expansion Volume in a Heating System with Ethylene GlycolĪ heating system with liquid volume 0.8 m 3 is freeze protected with 50% (by mass, mass fraction 0.5) ethylene glycol. Densities of Ethylene Glycol based Water Solutions Note! The specific gravity of ethylene glycol based water solutions are increased compared with specific gravity of clean water.
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Freezing Point of Ethylene Glycol based Water Solutionsįreezing points of ethylene glycol based water solutions at various temperatures are indicated belowĮthylene Glycol Water Solution Heat-Transfer Fluid - Specific Gravity Temperature Properties differs so much from clean water that heat transfer systems with ethylene glycol should be calculated thoroughly for actual temperature and solution. 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. Instead solutions based on propylene glycol are commonly used. Ethylene glycol should be avoided if there is a slightest chance of leakage to potable water or food processing systems. Ethylene glycol is also commonly used in heating applications that temporarily may not be operated (cold) in surroundings with freezing conditions - such as cars and machines with water cooled engines.Įthylene Glycol is the most common antifreeze fluid for standard heating and cooling applications. Ethylene Glycol based water solutions are common in heat-transfer applications where the temperature in the heat transfer fluid can be below 32 o F (0 oC).