Oily fluids with decent heat transfer properties ?

[Externet]

Hi.

Replacing water-based coolant in a ICE engine with a thin oily derivate that can perform near decently ?  Like kerosene, transmission fluid, hydraulic oil,  transformer, diesel, vegetable...   Which  could work, even increasing the radiator size, not boiling under 300F ? 

[John Cuthber]

Water is cheap, non toxic, and non flammable.

Good luck convincing people to change,

[Externet]

Thank you, John.

Respect to cheap, the antifreeze fluid that goes with the water is about $14/gal here. 

For the toxic part, a vehicle already has the antifreeze, the oils, fuel, the brake fluid, transmission fluid in it.

For the flammable part, a vehicle already has is oils and fluids plus fuel.  Exploring for an alternate oily coolant would not be of much impact.

Am not trying to convince anyone to change.    Ah... it would not boil that easy, would allow higher operating temperatures for more efficient/cleaner? operation,  would not freeze that easy,  no pressurizing needs, recycling/reusing possible...  Is it considering such too far from reality ?

[MigL]

IIRC many years ago, PCB based organic fluids were used for heat transfer/fire resistance in transformers.
Very unreactive and non-degradable.

But since they pose various health risks, are no longer available.

[Strange]

I can’t see any possible downside to using liquid sodium as a coolant in automobiles ...

[swansont]

15 hours ago, Externet said:

Hi.

Replacing water-based coolant in a ICE engine with a thin oily derivate that can perform near decently ?  Like kerosene, transmission fluid, hydraulic oil,  transformer, diesel, vegetable...   Which  could work, even increasing the radiator size, not boiling under 300F ? 

How about listing their specific heat capacities. It might become a little clearer.

[Externet]

Thanks.

Clearly, common oily compounds have around a quarter of thermal conductivity and specific heat as water has.

A random document ----> http://www2.eng.cam.ac.uk/~mpfs/papers/articles/WTC2005/pdfs/t-3/WTC2005-64316.pdf

There is specialized products that should be reasonable closer to water characteristics, if they are reasonably priced.  An additional important benefit not mentioned in post #3 is avoiding rust in cooling chambers.

Commercial example ----> https://www.mabayco.com/buy/heat-transfer-fluids/mobiltherm-605/