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Comparing ethylene glycol and propylene glycol antifreeze properties.
Characteristics of ethylene glycol and propylene glycol as antifreeze:
Antifreeze - Ethylene Glycol vs. Propylene Glycol
Property Ethylene Glycol Propylene Glycol Comments
Freeze point depression
More antifreeze is needed of propylene glycol to achieve the same freeze point
Heat transfer efficiency/capability
Ethylene glycol has superior heat transfer efficiency due to lower viscosity - but more fluid must be circulated to transfer the same amount of energy since Propylene glycol has higher specific heat.
Propylene glycol increases major head loss in the systems. Pumps head increased.
Chemical oxygen demand
degrades in 10 - 30 days
needs more than 20 - 30 days to degrade
A carcinogen is any substance or agent that promotes cancer
High level of acute when taken orally, targets the kidneys
Lower level of acute
Ethylene glycol should never be used in any drinking water or food processing system
Propylene glycol is used in small amounts in cosmetics
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Freeze protecting of cooling systems - temperature rating vs. required amount of antifreeze.
Online calculator, figures and tables showing density and specific weight of ethylene, C
2H 4, at varying temperature and pressure - Imperial and SI Units.
Specific heat of Ethylene Gas -
C - temperatures ranging 2H 4 175 - 900 K.
Properties like freezing point, viscosity, specific gravity and specific heat of ethylene glycol based heat-transfer fluids, or brines.
Comparing antifreezes used in water based heat transfer fluids or brines.
Freezing points of propylene glycol based heat-transfer fluids suitable for the food processing industry.
Comparing properties like specific gravity, freezing points and viscosity for secondary coolants like calcium chloride, sodium chloride, ethylene glycol and propylene glycol.
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