Heat Transfer Fluids and Thermal Oils Information
Heat transfer fluids and thermal oils are used to carry thermal energy in process heating, metal working, and machine cooling applications. There are several types of products. Circulating coolants, chiller fluids, anti-freezes, and refrigerants are used to transfer heat or provide cooling within machinery, process equipment or combustion engines. Hot oils, heater oils, and other thermal fluids are used to provide or transfer heat to a region near machinery or process equipment. Typically, products such as refrigerants, hot oils, and anti-freezes provide indirect heating or cooling and do not come into contact with the machinery or equipment. By contrast, metal working fluids and quenchants contact the workpiece or component directly. Most heat transfer fluids and thermal oils are used in circulating process heaters, chillers or coolers between a heat source and heat sink. Primary refrigerants provide cooling via phase changes or a Rankine cycle that consists of evaporative cooling and heat transfer. Secondary refrigerants include both circulating coolants and anti-freezes.
Heat transfer fluids and thermal oils vary in terms of chemical composition. Synthetic products include ester and diester compounds, polyglycol and water-glycol fluids, and silicone-based greases and oils. They are formulated from alkaline organic and inorganic compounds and used in diluted form with concentrations ranging from 3% to 10%. Non-synthetic products consist of petroleum or mineral oils and may include water. Synthetic products are more expensive than non-synthetic fluids, but provide better fire resistance and cooling performance. The cost and heat transfer performance of semi-synthetic fluids falls between those of synthetic and soluble oil fluids. Chlorofluorocarbons (CFCs) are nonflammable chemicals that contain carbon, chlorine, and fluorine. Halogenated fluorocarbon (HFC), halogenated chlorofluorocarbon (HCFC), and perfluorocarbon (PFC) fluids are included in this group.
Heat transfer fluids and thermal oils vary in terms of kinematic viscosity, operating temperature, pour point, boiling point, and flash point. Kinematic viscosity is the time required for a fixed amount of fluid or oil to flow through a capillary tube under the force of gravity. Units of measure include stoke, centistoke (1/100 of stoke) and Saybolt universal seconds (SUS). Pour point, the lowest point at which a fluid flows, is generally 15° F to 20° F below the system’s lowest end-use temperature to prevent pump damage through cavitation. Flash point is the lowest temperature at which a liquid produces sufficient vapors to form an ignitable mixture in air near the surface. Fire point and autogenous ignition are important considerations when selecting fire resistant fluids. Fire point is the lowest temperature at which a liquid can produce sufficient vapors to form a mixture in air that continuously supports combustion after ignition. Autogenous ignition (AIT) is the temperature at which ignition occurs spontaneously.
Heat transfer fluids and thermal oils are used in a variety of applications and industries. Some products are used in aerospace, automotive, marine, or military applications. Others are used with combustion engines, processing equipment, compressors, piston pumps, gears, and final drives. Specialty heat transfer fluids and thermal oils can inhibit or prevent oxidation, corrosion, or microbial growth. Biodegradable products are designed to break down into harmless chemicals when released into the environment. Non-foaming characteristics are achieved through the use of additives that break out entrained air. Heat transfer fluids and thermal oils that are rated food, beverage, and pharmaceutical applications are also available.Read user Insights about Heat Transfer Fluids and Thermal Oils
Related Products & Services
Dielectric Greases and Insulating Fluids
Dielectric greases and insulating fluids are applied to electric terminals in high voltage equipment to minimize disharges, insulate and lubricate non-conductive surfaces, exclude moisture, and conduct heat.
Hydraulic Oils and Transmission Fluids
Hydraulic oils and transmission fluids are used to transmit power in hydraulic equipment and power transmission applications.
Industrial greases are thickened gels that consist of natural, synthetic, or semi-synthetic substances. They do not run off surfaces and are used in a variety of lubrication, sealing, and exclusion applications.
Industrial lubricants are oils, fluids, greases and other compounds designed to reduce friction, binding or wear and exclude moisture. Specialized characteristics may enhance thermal conduction across thermal interfaces or reduce electrical resistivity across electrical joints.
Metalworking Lubricants, Coolants, and Fluids
Metalworking lubricants, coolants and fluids are specialized coatings and carriers for metal forming, metal cutting, lapping, polishing, and grinding applications.
Mold Releases and Release Agents
Mold releases and release agents are film forming lubricating oils, solid lubricants, waxes, fluids or coatings that prevent other materials from sticking or adhering to an underlying surface.
Synthetic Oils, Greases, and Lubricants
Synthetic oils, greases and lubricants are based on synthetic compounds such as silicone, polyglycol, esters, digesters, chlorofluorocarbons (CFCs) and mixtures of synthetic fluids and water.