Table 1 - Ethylene Glycol Versus Propylene Glycol Thermal Conductivities Temperature (F) Ethylene Glycol Thermal Conductivity [Btu/(hrft^2)(F/ft)] at 30% Volume Ethylene glycol and propylene glycol are organic compounds with alcohol functional groups. It has a long track record over many decades in this application and is widely available from a number of sources. All of us at Recochem are committed to service and quality. with your system prior to installing ethylene glycol. 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. Douglas Products. For these reasons, inhibited glycols are the heat transfer fluid of choice for the HVAC industry. The fluid is dyed yellow for leak detection. And while glycol solutions have a maximum operating temperature of 320°F, Paratherm LR is completely stable up to it’s 450°F maximum operating temperature. 's, as water with a heat capacity of 1, the mass flow rate will need to increase. They are alcoholic compounds due to the presence of –OH groups. Heat transfer fluid formulation of propylene designed package of industrial corrosion inhibitors. In HVAC applications, ethylene glycol is more widely used because of its lower cost, lower viscosity and better heat transfer properties. Propylene glycol, another common coolant, has an even lower specific heat. Propylene Glycol: Propylene Glycol is used as a solvent for intravenous, oral, and topical pharmaceutical preparations. Propylene Glycol has a much lower capacity for efficient heat transfer, compared with Ethylene Glycol based mixtures. Ethylene glycol and propylene glycol are organic compounds. However, when toxicity is a concern, such as with food Dow glycol-based fluids include inhibited ethylene glycol (EG) and propylene glycol (PG)-based fluids. Propylene glycol is also used for it's heat transfer and freeze protection properties. Conclusion. 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. Glycol and it has to do with freeze protection and heat transfer. The term “glycol” is used when there are two hydroxyl groups present in neighboring carbon atoms. All Categories . 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. High viscosity fluids require greater pumping-energy and therefore cost more to run. Pumps ... Douglas HTF Inhibited Propylene Glycol. $23.95 - $139.70. Heat transfer fluids One substance - multiple benefits. 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. Heat Transfer Fluids (LTHTFs), which are described in this brochure. Cannon Water is a supplier of heat transfer fluids such as coolants, secondary refrigerants, glycol, brines and high temperature heat transfer fluids. The viscosity makes it easier to pump and the better heat transfer properties allow for greater freeze protection with a lower glycol … 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. 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. 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%. That’s why companies choose Susterra® propanediol, the higher-performing, 100% plant-based glycol, as the primary ingredient in their heat-transfer fluids. 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. differences between ethylene and propylene glycol fluids: viscosity and toxicity. Propylene glycol (PG) has become the most common heat transfer fluid used in closed-loop solar heating systems that contain antifreeze. 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. Therefore, they generally provide superior heat transfer efficiency and better low temperature performance and are preferred for most heat transfer applications. designed for ethylene glycol can adversely affect performance. Ethylene glycol-based glycol-based fluids. Propylene and Ethylene glycol are commonly used heat transfer fluids for protection in Industrial and Commercial closed loop, water based HVAC, and cooling systems. Similar to ethylene glycol, when inhibited, these glycols also protect HVAC systems against damage from corrosion. 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. Depending upon the application, PSC offers Heat Transfer Fluids in varying viscosities and degrees of thermal stability. It is also much more viscous at low temperatures and thus provides more of a challenge to pump. Ethyl protects from freezing better than prop. 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 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. Recently a vegetable based Propylene Glycol has become commercially available, if not always financially viable. 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. 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). For example, the higher viscosity of propylene glycol (about 2x ethylene glycol), especially at lower temperatures, directly translates into higher pumping costs. To be able to transfer the same number of B.T.U. This product is preferred for use where low toxicity is desired. -60 degrees F to 250 degrees F. In burst protection liquids, propylene glycol, with its inherently high boiling point, lowers vapour pressure.. Between the two, ethylene glycol (C 2H6O2) is a better heat transfer fluid than propylene glycol (C 3H8O2). 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%). Best heat transfer rates of all glycols and often selected ahead of propylene glycol for this reason. Ethylene Glycol - key benefits. Normal Operation – 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. Propylene Glycol’s primary function is to absorb water. Significantly less viscous (lower viscosity) than propylene glycol, especially at sub-zero temperatures. The specific heat capacity of ethylene glycol–based water solutions is less than that of pure water. Its common use is for heat transfer for things such as hydronic, heat pump, and solar heating systems. Glycol Sol. Figure 1. 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 … Coolant and heat-transfer agent. 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. Ethylene vs Propylene Glycol . The major use of ethylene glycol is as a medium for convective heat transfer in, for example, automobiles and liquid-cooled computers. Overview. Susterra® propanediol has exactly the same chemical formula as propylene glycol but a slightly different structure due … Propylene glycol is much less toxic than ethylene glycol. Propylene glycol fluids are often selected because of their low acute oral toxicity vs. the moderate acute oral toxicity of ethylene glycols. 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 Propylene glycol fluids are often selected because of their low acute oral toxicity vs. the moderate acute oral toxicity of ethylene glycols. It is for this reason that ThermalStar is produced using only new GRAS propylene glycol. 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. Visit our website for more. (you need more propylene to achieve the same freezing point) but prop. Ethylene Glycol Specifications(DOWTHERM SR1). The results were that a 50/50 ethylene glycol/water mixture had a specific heat of 0.99 as opposed to 1 for water. Heat transfer performance comparison of propylene glycol and ethylene glycol solutions. Ethylene Propylene Ethylene Propylene Glycol Glycol Glycol Sol. Its poorer heat transfer properties can also reduce cooling capacity. Also thermal conductivity and heat transfer coefficient were improved by increasing the temperature and concentration of graphene. 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. 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. 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. 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