Ethylene glycol and propylene glycol are organic compounds. Propylene glycol, another common coolant, has an even lower specific heat… Its common use is for heat transfer for things such as hydronic, heat pump, and solar heating systems. 's, as water with a heat capacity of 1, the mass flow rate will need to increase. In burst protection liquids, propylene glycol, with its inherently high boiling point, lowers vapour pressure.. A balanced inhibitor system, to protect common metals of construction. In HVAC applications, ethylene glycol is more widely used because of its lower cost, lower viscosity and better heat transfer properties. In food processing systems the common heat-transfer fluid is based on propylene glycol. As well as this, due to the lower viscosity of ethylene glycol it possesses excellent heat transfer properties. Propylene Glycol: Propylene Glycol is used as a solvent for intravenous, oral, and topical pharmaceutical preparations. They are alcoholic compounds due to the presence of –OH groups. Identify glycol to water ratio. Hydronic fluids are heat transfer fluids composed of three key ingredients: Water, to provide heat transfer Ethylene or propylene glycol, to depress the freeze point of the fluid. Propylene glycol is less toxic and is considered when toxicity is a concern. Heat transfer performance comparison of propylene glycol and ethylene glycol solutions. Glycol Sol. Ethylene glycol-based glycol-based fluids. Ethylene vs. Propylene Glycol Typically either ethylene glycol or propylene glycol are used in HVAC closed loops, with the type of glycol and its concentration determining the freeze point and other physical properties (see Table One). Ethylene glycol and propylene glycol are organic compounds with alcohol functional groups. Online retailer of Dow® Inhibited Propylene and Ethylene Glycol. ThermalStar® is the propylene glycol based heat transfer fluid manufactured by Thermal Fluids and is widely used in secondary cooling and heating applications specifically where incidental contact with humans, food, or beverage products may occur. Best heat transfer rates of all glycols and often selected ahead of propylene glycol for this reason. Conclusion. Dynalene offers pure ethylene glycol that is available in technical grade. Blended with propylene glycol or ethylene glycol base, MAXTECH HTF can increase system performance and longevity while … Table 1 - Ethylene Glycol Versus Propylene Glycol Thermal Conductivities Temperature (F) Ethylene Glycol Thermal Conductivity [Btu/(hrft^2)(F/ft)] at 30% Volume It transfers heat better than propylene glycol, and can function at temperatures as low as -100º F. Ethylene Glycol is an excellent choice for protecting natural metals. Ethylene Glycol is widely used as an antifreeze and automotive heat transfer fluid. The other side is that I in my first car - a '66 Impala with a 327 engine - I changed the anti-freeze (ethylene glycol) twice a year. Since we recommend propylene based glycols because of their non-hazardous nature, we must be aware of the effects on the standard refrigeration heat … What is Inhibited Glycol? and toxicity. ... anticipated temperature (also known as the burst point) by adjusting the antifreeze mix ratio, or the concentration of glycol in the heat transfer fluid. differences between ethylene and propylene glycol fluids: viscosity and toxicity. Propylene and Ethylene glycol are commonly used heat transfer fluids for protection in Industrial and Commercial closed loop, water based HVAC, and cooling systems. or accounts needed. Heat transfer fluids One substance - multiple benefits. Propylene glycol is much less toxic than ethylene glycol. Glycol Capacities and Correction Tables The charts, above, illustrate the differences between propylene based and ethylene based glycol. Water is nature’s heat transfer fluid, a liquid used since the dawn of time to heat and cool. Propylene Glycol’s primary function is to absorb water. If a substance like glycol (ethylene or propylene) is mixed with water it in effect lowers the heat capacity of the liquid (.97-.93) depending on the concentration. Heat Transfer Fluids (LTHTFs), which are described in this brochure. Propylene glycol (PG) has become the most common heat transfer fluid used in closed-loop solar heating systems that contain antifreeze. Mono Ethylene Glycol, or simply, Ethylene Glycol is an organic compound having the molecular formula as CH2OHCH2OH. Significantly less viscous (lower viscosity) than propylene glycol, especially at sub-zero temperatures. Dynalene Propylene Glycol is an inhibited non-toxic propylene glycol heat transfer fluid which offers users a stable, safe, and efficient product for applications where freeze protection is needed. The most common antifreeze fluid - ethylene glycol - must not be used where there is a chance of leakage to potable water or food processing systems. The major use of ethylene glycol is as a medium for convective heat transfer in, for example, automobiles and liquid-cooled computers. Our line of RECOTHERM (ethylene glycol based) and RECOFREEZE (propylene glycol based) LTHTFs provide the same level of manufacturing expertise, product quality, consistency and reliability for which Recochem is known. Why Choose Inhibited Glycol? Depending upon the application, PSC offers Heat Transfer Fluids in varying viscosities and degrees of thermal stability. Ethylene glycol is primarily used in antifreeze formulations (50%) and as a raw material in the manufacture of polyesters such as polyethylene terephthalate (PET) (40%). Ethylene glycol is commonly used in applications where efficiency is important and there is no human or animal contact due to the toxicity of the ethylene glycol chemistry. This can be used as a raw material in a number of different applications or as a heat transfer fluid. Between the two, ethylene glycol (C 2H6O2) is a better heat transfer fluid than propylene glycol (C 3H8O2). To be able to transfer the same number of B.T.U. The specific heat capacity of ethylene glycol–based water solutions is less than that of pure water. For example, freeze point depression is much more effective using ethylene glycol – so more propylene glycol would be required to maintain the same freeze point as ethylene. Regarding base fluid, conventional heat transfer fluids such as water, ethylene glycol or propylene glycol are usually used as single base fluids or single phase liquid mixtures. View glycol concentration chart or use our calculator to determine freezing point and burst point of propylene glycol and ethylene glycol. As with other Dynalene glycol products, raw ethylene glycol is offered as a full concentrate or we can blend it with DI water to any concentration required. ThermalStar hydronic heat transfer fluid is a fully inhibited propylene glycol based solution designed for applications where incidental contact with humans, food, or beverage products could occur. No order mins. 877.244.5525 (U.S.) However, due to its moderate toxicity, it is subject to reporting requirements in the event of a spill or discharge (> 5,000 pounds). Coolant and heat-transfer agent. It is for this reason that ThermalStar is produced using only new GRAS propylene glycol. Glycols are normally used for industrial HVAC, Process cooling/heating, and antifreeze. Ethylene glycol has a melting point of 197.3 °C.

Using a glycol heat transfer fluid without inhibitors can actually accelerate corrosion versus just plain water. Ethylene glycol-based fluids are less viscous than propylene glycol-based fluids. Heat transfer efficiency/capability: better: less: Ethylene glycol has superior heat transfer efficiency due to lower viscosity - but more fluid must be circulated to transfer the same amount of energy since Propylene glycol has higher specific heat. High viscosity fluids require greater pumping-energy and therefore cost more to run. With unmatched product and systems application knowledge, our team helps each customer do the job right the first time. In engine coolants, propylene glycol is mainly used to reduce the freezing point of the liquid, thus preventing the cooling system and the engine from corrosion, overheating and freezing. Ethylene Propylene Ethylene Propylene Glycol Glycol Glycol Sol. Both glycol based fluids can provide fluid freeze protection to -60F and system burst Ethylene vs Propylene Glycol . Read More Ethylene (EG) & Propylene Glycol (PGIG & PGFG) HEAT TRANSFER SOLUTIONS ATLANTIC CHEMICAL & EQUIPMENT COMPANY'S heat transfer products ACE ETHYLENE GLYCOL(EG)and PROPYLENE GLYCOL (PG)are the ideal answer to inadequate freeze protection of HVAC systems. It has a long track record over many decades in this application and is widely available from a number of sources. There are two main types of glycols, ethylene glycol and propylene glycol with propylene glycol available in industrial and food grades. It is clear, colorless and practically odorless liquid completely soluble in water. For many heat-transfer applications it is necessary to use a heat-transfer fluid with lower freezing point than water. Table 2 shows the relative heat transfer of the two Glycol solutions compared to water for various coolant flow rates, further illustrating that the heat transfer perfor-mance of this downflow radiator is considerably less when using the Propylene Glycol solution than when using the Ethylene Glycol solution at coolant flows below 5.05 L/s (80 gpm). Ethylene Glycol based water solutions are common in heat-transfer applications where the temperature in the heat transfer fluid can be below 32 o F (0 o C).Ethylene glycol is also commonly used in heating applications that temporarily may not be operated (cold) in surroundings with freezing conditions - such as cars and machines with water cooled engines. Figure 1. MAXTECH HTF is formulated with high performance, industrial phosphated inhibitor chemistry to guarantee optimal heat transfer efficiency. The term “glycol” is used when there are two hydroxyl groups present in neighboring carbon atoms. Their molecular formulas are different; thus they have some different physical properties. Therefore, they generally provide superior heat transfer efficiency and better low temperature performance and are preferred for most heat transfer applications. Ethylene Glycol - key benefits. The results were that a 50/50 ethylene glycol/water mixture had a specific heat of 0.99 as opposed to 1 for water. with your system prior to installing ethylene glycol. Therefore, they generally provide superior heat transfer efficiency and better low temperature performance and are preferred for most heat transfer applications. All of us at Recochem are committed to service and quality. For these reasons, we do not recommend uninhibited glycols be used for HVAC heat transfer. Whereas ethylene glycol would be used in closed systems and in controlled industrial applications. Go Glycol Pros has provided dependable freeze protection and corrosion resistance for over 20 years. 100% 100% 50% v 50% v Molecular Weight 62.1 76.1 Freeze Point (°F) 8 -71(Tg) -34 -29 Specific Gravity 1.110 1.033 1.082 1.050 Density (lb/ft3 @ 70°F) 69.12 64.32 67.05 65.14 Flash Point (°F) 240 220 None None Boiling Point (°F) 387 369 225 222 Viscosity: lower: higher: Propylene glycol increases major head loss in the systems. C 2 H 4 O + H 2 O → HO−CH 2 CH 2 −OH.

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