Its thermal conductivity is higher than all other gases, it has high specific heat capacity, low density and therefore low viscosity, which is an advantage for rotary machines susceptible to windage losses. Hydrogen is used as a high-performance gaseous coolant. Air cooling uses either convective airflow (passive cooling), or a forced circulation using fans. The latter, when used to achieve below- ambient temperature, is more commonly known as refrigerant.Īir is a common form of a coolant. This coolant can either keep its phase and stay liquid or gaseous, or can undergo a phase transition, with the latent heat adding to the cooling efficiency. It has varying oil content from nil oil (synthetic coolant). Water-soluble coolant is oil in water emulsion. Industrial cutting fluid has broadly been classified as water-soluble coolant and neat cutting fluid. While the term "coolant" is commonly used in automotive and HVAC applications, in industrial processing heat-transfer fluid is one technical term more often used in high temperature as well as low-temperature manufacturing applications. Some applications also require the coolant to be an electrical insulator. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert and neither causes nor promotes corrosion of the cooling system. Short description: Substance used to reduce or regulate the temperature of a systemĪ coolant is a substance, typically liquid, that is used to reduce or regulate the temperature of a system.
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