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