30% Propelyene Glycol/Water Mixture
30% Propelyene Glycol/Water Mixture
(OP)
I am trying to find the specific heat of a 30% Propylene Glycol/Water mixture. Is the heat transfer capability lower or higher than just pure water? If the heat transfer is lower, why are solutions like this used instead of just water in heat exchange systems (corrosion?)?
Thanks.
Thanks.





RE: 30% Propelyene Glycol/Water Mixture
RE: 30% Propelyene Glycol/Water Mixture
RE: 30% Propelyene Glycol/Water Mixture
Lots of systems can be out of service - either intentionally or by accident - in sub freezing weather. Water filled systems will freeze and split.
RE: 30% Propelyene Glycol/Water Mixture
Beside this, ethylene glycol mixture has higher boiling point than the water which allow for the working of the radiator at higher temperature.
RE: 30% Propelyene Glycol/Water Mixture
The kinematic viscocity is also higher than water and has a pump energy penalty.
RE: 30% Propelyene Glycol/Water Mixture
www.flatplate.com/software.htm
RE: 30% Propelyene Glycol/Water Mixture
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JMW
www.ViscoAnalyser.com
RE: 30% Propelyene Glycol/Water Mixture
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RE: 30% Propelyene Glycol/Water Mixture
The specific heat varies with both concentration and temperature. According to the old program I have from Dow, the specific heat of 30% propylene glycol is:
.901 @ 10 F
.933 @ 100 F
.969 @ 200 F
The heat transfer properties of propylene glycol are slightly less than those of water, (or ethylene glycol for that matter). The reasons are (1) lower specific heat (2) lower thermal conductivity, and (3) higher viscosity.
Glycols are usually used to prevent freezing. However, it appears that the freezing point of 30% propylene glycol is around 8 deg F.
Regards,
Speco
RE: 30% Propelyene Glycol/Water Mixture
RE: 30% Propelyene Glycol/Water Mixture
I'm not 100% sure but aqueous ammonia might, although by a small margin.