I'm looking for a solution for -7 C using in super cold storage tank. If i use water it will be change phase to solid.
The solution has the following properties:
- still liquid phase at -7 C may be to -10 C in Atmospheric pressure.
- non-corrosive to copper
- cheap price
- not toxic to the respiratory system
- not-flammable
Best regards, Mongkon
Dear Mongkon Taweebunlon many thanks for asking this interesting technical question. Personally I'm not an engineer, but to the best of my knowledge mixtures of glycol (= ethylene glycol) and water are best suited for this purpose. In this context please have a look e.g. at the following potentially useful link:
WHAT IS GLYCOL? HOW IS IT USED IN A CHILLER?
https://www.jcyounger.com/glycol-chiller/
According to this link mixtures of water and 30% ethylene glycol freeze at -13.7 °C (7.3 F). Glycol is cheap, and the mixtures are non-flammable. Concerning the corrosion properties, please also see the following relevant articles:
Galvanic Corrosion Study in Ethylene Glycol
Article Galvanic Corrosion Study in Ethylene Glycol
and
Monopropylene glycol based heat transfer fluid: Effects of green and synthetic corrosion inhibitors on copper and aluminum with ageing tests
Article Monopropylene glycol based heat transfer fluid: Effects of g...
Both papers are freely available as public full texts on RG.
Please stay safe and healthy! With best wishes, Frank Edelmann
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