differences between ethylene and propylene glycol fluids: viscosity and toxicity. The results from the tests showed that by using ethylene versus propylene, the heat transfer of the coil increased by 47936 Btu/hr or 8.9%. 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. Propylene Glycol: Propylene Glycol is used as a solvent for intravenous, oral, and topical pharmaceutical preparations. 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%). In burst protection liquids, propylene glycol, with its inherently high boiling point, lowers vapour pressure.. Ethylene glycol and propylene glycol are organic compounds. Propylene Glycolâs primary function is to absorb water. It is for this reason that ThermalStar is produced using only new GRAS propylene glycol. They are alcoholic compounds due to the presence of âOH groups. Propylene glycol is also used for it's heat transfer and freeze protection properties. The inhibitors in Dow glycol-fluids are specially formulated to protect system components against corrosion and scaling that can increase maintenance and operating expense, reduce system efficiency and even lead to system failure. We produce a range of inhibited glycol coolant-based heat transfer fluids which are used across heating, cooling, including Ground Source Heat Pumps and many other industrial applications. Heat transfer performance comparison of propylene glycol and ethylene glycol solutions. The viscosity makes it easier to pump and the better heat transfer properties allow for greater freeze protection with a lower glycol ⦠'s, as water with a heat capacity of 1, the mass flow rate will need to increase. The specific heat capacity of ethylene glycolâbased water solutions is less than that of pure water. Propylene glycol is much less toxic than ethylene glycol. And while glycol solutions have a maximum operating temperature of 320°F, Paratherm LR is completely stable up to itâs 450°F maximum operating temperature. Heat transfer fluid formulation of propylene designed package of industrial corrosion inhibitors. Depending upon the application, PSC offers Heat Transfer Fluids in varying viscosities and degrees of thermal stability. Normal Operation â During normal operation you do NOT want to operate with propylene glycol as this coolant does not have the same density and therefore heat transfer capacity as ethylene glycol. 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. Pumps ... Douglas HTF Inhibited Propylene Glycol. 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 Similar to ethylene glycol, when inhibited, these glycols also protect HVAC systems against damage from corrosion. 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. 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. Heat transfer fluids One substance - multiple benefits. Propylene glycol fluids are often selected because of their low acute oral toxicity vs. the moderate acute oral toxicity of ethylene glycols. Propylene and Ethylene glycol are commonly used heat transfer fluids for protection in Industrial and Commercial closed loop, water based HVAC, and cooling systems. glycol-based coolants, therefore ethylene glycol will provide better heat transfer than propylene glycol across the entire temperature range, as depicted in Figure 1 below. (you need more propylene to achieve the same freezing point) but prop. However, due to its moderate toxicity, it is subject to reporting requirements in the event of a spill or discharge (> 5,000 pounds). As it pertains to the transfer of heat from the engine to the cooling system the best fluid available is ⦠Significantly less viscous (lower viscosity) than propylene glycol, especially at sub-zero temperatures. Douglas Products. Its common use is for heat transfer for things such as hydronic, heat pump, and solar heating systems. For example, the higher viscosity of propylene glycol (about 2x ethylene glycol), especially at lower temperatures, directly translates into higher pumping costs. Ethylene glycol-based glycol-based fluids. Glycol Sol. Figure 1. Therefore, they generally provide superior heat transfer efficiency and better low temperature performance and are preferred for most heat transfer applications. 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. The fluid is dyed yellow for leak detection. Between the two, ethylene glycol (C 2H6O2) is a better heat transfer fluid than propylene glycol (C 3H8O2). Coolant and heat-transfer agent. 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. To be able to transfer the same number of B.T.U. Cannon Water is a supplier of heat transfer fluids such as coolants, secondary refrigerants, glycol, brines and high temperature heat transfer fluids. The term âglycolâ is used when there are two hydroxyl groups present in neighboring carbon atoms. Visit our website for more. Ethylene glycol is a molecule having two hydroxyl groups on a 2 carbon chain, making it less viscous and providing slightly better heat transfer properties than propylene glycol. In order to achieve the same amount of heat transfer when using propylene glycol, under the same operating conditions, a coil with an increased surface area of 8.9% would have to be used. Conclusion. Propylene Glycol has a much lower capacity for efficient heat transfer, compared with Ethylene Glycol based mixtures. Their molecular formulas are different; thus ⦠In HVAC applications, ethylene glycol is more widely used because of its lower cost, lower viscosity and better heat transfer properties. 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. Also thermal conductivity and heat transfer coefficient were improved by increasing the temperature and concentration of graphene. Its poorer heat transfer properties can also reduce cooling capacity. 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. Glycol and it has to do with freeze protection and heat transfer. All Categories . The major use of ethylene glycol is as a medium for convective heat transfer in, for example, automobiles and liquid-cooled computers. Ethylene Glycol Specifications(DOWTHERM SR1). Table 1 - Ethylene Glycol Versus Propylene Glycol Thermal Conductivities Temperature (F) Ethylene Glycol Thermal Conductivity [Btu/(hrft^2)(F/ft)] at 30% Volume It is also much more viscous at low temperatures and thus provides more of a challenge to pump. Dow glycol-based fluids include inhibited ethylene glycol (EG) and propylene glycol (PG)-based fluids. However, when toxicity is a concern, such as with food $23.95 - $139.70. Ethylene Glycol - key benefits. Overview. And our products also offer protection to the ground, air and water source heat pumps, green technology, and HVAC Systems, as well as providing comprehensive antifreeze and corrosion protection. -60 degrees F to 250 degrees F. with your system prior to installing ethylene glycol. For these reasons, inhibited glycols are the heat transfer fluid of choice for the HVAC industry. According to the obtained results, thermal conductivity and heat transfer coefficient increased by 21.2% and 42.4%, respectively, only by the addition of 0.15wt % of graphene in to ethylene glycol. Ethylene glycol and propylene glycol are organic compounds with alcohol functional groups. The heat transfer and hydraulic performance of the following coolants was examined in five automobile radiators in a wind tunnel: 100% Water, 100% Propylene Glycol, 70/30 Propylene Glycol/Water (Volume), 50/50 Propylene Glycol/Water (Volume), 70/30 Ethylene Glycol/Water (Volume), 50/50 Ethylene Glyc Heat Transfer Fluids (LTHTFs), which are described in this brochure. Propylene glycol fluids are often selected because of their low acute oral toxicity vs. the moderate acute oral toxicity of ethylene glycols. Paratherm LR low range heat transfer fluid has higher heat-transfer coefficients than 50% ethylene-glycol and 50% propylene-glycol solutions below -22°F and -4°F respectively. TRUEGARD Ethylene Glycol Uninhibited-Heat Transfer Fluid 100% Concentrate Solutions in water provide freeze protection to below -60 degrees F and burst protection to -100 degrees F. Suitable applications: closed loop, water-based haul, process heating and cooling, food industry applications within temperature range. This product is preferred for use where low toxicity is desired. Propylene glycol is less toxic and is considered when toxicity is a concern. Ethyl protects from freezing better than prop. It has a long track record over many decades in this application and is widely available from a number of sources. Propylene glycol, another common coolant, has an even lower specific heat. designed for ethylene glycol can adversely affect performance. Propylene glycol (PG) has become the most common heat transfer fluid used in closed-loop solar heating systems that contain antifreeze. Best heat transfer rates of all glycols and often selected ahead of propylene glycol for this reason. All of us at Recochem are committed to service and quality. The results were that a 50/50 ethylene glycol/water mixture had a specific heat of 0.99 as opposed to 1 for water. High viscosity fluids require greater pumping-energy and therefore cost more to run. 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). Susterra® propanediol has exactly the same chemical formula as propylene glycol but a slightly different structure due ⦠Thatâs why companies choose Susterra® propanediol, the higher-performing, 100% plant-based glycol, as the primary ingredient in their heat-transfer fluids. Ethylene Propylene Ethylene Propylene Glycol Glycol Glycol Sol. 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