Propylene glycol, also known as Propane-1,2-diol is used as a heat transfer fluid and antifreeze, particularly as a low corrosion non-toxic substitute
to ethylene glycol based cooling systems. In aluminium based cooling systems
like HVAC/R, propylene glycol has shown efficacy comparable to ethylene glycol.
Benefits of PG:
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Low freezing point
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The ability to decrease the freezing point of water
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Burst protection
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Low mammalian toxicity
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Low flammability
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Excellent heat transfer properties
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A high boiling point, low vapor pressure
Water based fluids expand in volume when they
freeze, causing rupturing of pipes and containment vessels. Ethylene glycol has
severe toxicological and environmental implications making it unsuited for
cases of human exposure. Water-PG mixtures in low temperature conditions do not
create extra pressure on vessel walls and in case of leakage, they are not
hazardous. This makes Propylene glycol the ideal active ingredient as heat
transfer fluid in industrial systems.
DOWCAL 200 manufactured by
DOW Chemicals is propylene glycol based heat transfer fluid antifreeze that has a wide
range of application. It has been
formulated to operate at temperatures higher than what ordinary glycol fluids
can. It has a low acute oral toxicity and includes a specially designed
inhibitor package to prevent corrosion of common materials used in HVAC, Food
beverage processing, solar power plants etc.
Applications:
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Single fluid process heating and cooling
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Closed-loop water based heating & air conditioning systems
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Food and brewery industry
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HVAC systems
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Pharmaceuticals
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Secondary cooling and heating
·
Freeze and Burst protection
·
Renewable energy systems
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